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1
Batigun, Caner. "Determination Of Welding Parameter Dependent Hot Cracking Susceptibility Of 5086-h32 Aluminium Alloy With The Use Of Mvt Method." Phd thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/3/12605721/index.pdf.
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Hot cracking is a serious problem that encounters during welding of aluminium-magnesium alloys. In the present study, solidification and liquation type of hot cracks in weld metal and the heat-affected zones of 5086-H32 aluminium alloy were investigated by using Modified Varestraint Test (MVT) with TIG-AC and TIG-DC welding. With determining the size, type and number of cracks, a relation was established between welding line energy and strain on the hot crack formation. This information was used to determine the hot crack safe parameter ranges. The hot cracking tendency as a function of applied parameters were discussed in the frame of temperature fields around the moving heat source. Moreover, the characteristic hot crack locations on the 5086-H32 MVT specimens were generalized.
The results of the study indicated that the increase in line energy and strain increased the hot cracking tendency of the specified aluminium alloy. In the low line energy range, the main hot cracking mechanism is the solidification cracking which could be overcome by the use of a suitable filler material. At high line energy range, due to the increased amount of interdendritic liquid, the amount of solidification cracking decreases by healing mechanism. However, because of the enlarged-temperature-field around the weld zone, fraction of HAZ cracking increases. The comparison between the hot cracking tendencies in low and high line energies indicates that the low line energy ranges with low augmented strains resulted in hot crack safer parameters.
2
Chu, XingRong. "Caractérisation expérimentale et prédiction de la formabilité d'un alliage d'aluminium en fonction de la température et de la vitesse de déformation." Phd thesis, INSA de Rennes, 2013. http://tel.archives-ouvertes.fr/tel-00910093.
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Les procédés de mise en forme de tôles minces sont très largement répandus dans l'industrie. Néanmoins, l'utilisation de ces procédés est limitée par le niveau de formabilité du matériau formé, notamment dans le cas des alliages d'aluminium. Afin d'améliorer ces limites de formabilité, des procédés de mise en forme à chaud peuvent être envisagés. L'objectif de cette thèse est d'étudier à l'aide d'approches expérimentale et numérique l'effet de la température et de la vitesse de déformation sur la formabilité des tôles en alliage d'aluminium AA5086 et de proposer une modélisation capable de prédire ces effets. Une campagne d'essais a été réalisée sur ce matériau à partir d'un essai d'emboutissage de type Marciniak. Des courbes limites de formage (CLF) ont été établies sur une plage de température allant de l'ambiant jusqu'à 200°C et pour des vitesses de déformation allant du quasi-statique à 2s-1. Des effets, positif de la température et négatif de la vitesse de déformation sur la formabilité ont été mis en évidence. La prise en compte des effets de la température et de la vitesse de déformation dans les modèles prédictifs des CLF, qu'ils soient analytiques ou numériques, est à ce jour très limitée. Dans ce travail, un modèle numérique prédictif basé sur la simulation par éléments finis du modèle géométrique de Marciniak et Kuczynski (M-K) est proposé. Les déformations limites obtenues avec de ce modèle sont très sensibles à la description du comportement thermo-viscoplastique du matériau et à la calibration du défaut géométrique pilotant l'apparition de la striction dans le modèle M-K. Des essais de traction uniaxiale réalisés dans les mêmes conditions opératoires que les essais de mise en forme de Marciniak ont permis d'identifier des lois d'écrouissage de nature très différentes (rigidifiante, saturante ou mixte). Ces lois conduisent à des prédictions très différentes de la formabilité du matériau pour une valeur donnée du défaut géométrique du modèle EF M-K. Différentes stratégies de calibration de la taille de ce défaut initial ont été envisagées. L'utilisation du point expérimental de la CLF correspondant à des conditions de déformation plane permet de calibrer de manière satisfaisante la valeur de ce défaut. Cette procédure de calibration a été appliquée pour l'ensemble des lois identifiées. Les lois de nature rigidifiante de type Ludwick se sont montrées les plus effficaces alors que les lois saturante de type Voce se sont avérées incapables de prédire la formabilité du matériau pour certaines conditions opératoires. Finalement, il est démontré qu'une valeur constante du défaut géométrique ne peut être retenue pour l'ensemble des conditions opératoires étudiées même si le modèle M-K s'est avéré assez efficace pour représenter l'effet de la température plutôt que celui de la vitesse de déformation.
3
Abdul-Mahdi, F. S. "Tribological characteristics of coatings on aluminium and its alloys." Thesis, Brunel University, 1987. http://bura.brunel.ac.uk/handle/2438/5016.
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Hard anodising on aluminium and its alloys has been widely practised for many years in order to improve the resistance of the otherwise poor wear characteristics of aluminium. In recent years there has been an increasing interest in other treatments and coatings, on both aluminium and other base metals. The aim of this investigation is to explain the tribological performance and wear mechanism(s) of an uncoated aluminium alloy, four anodic coated alloys, and also an electroless nickel alloy. All of the coatings are produced on three different aluminium alloys. The thickness of the anodic films is 30-35 micron, as this thickness falls within the range commonly used by industry. In an endeavour to explain the role of coating thickness on wear life, electroless nickel alloy has been produced in a range of thicknesses of 10, 20 and 30 micron. To evaluate abrasive and adhesive wear, the samples were rubbed against a single point diamond and steel ball, respectively, in a reciprocating movement at room temperature and 65-75% relative humidity, under a wide range of load and sliding distance. Some tests continued to run until a breakdown of the coatings occurred, whilst other tests were interrupted at intermediate stages. This enabled the initiation and propagation of failure mechanisms to be studied. Abrasive wear was performed under dry conditions, whereas, adhesive wear was evaluated under both dry and lubricated conditions. Wear of these coatings was proportional to the applied load and sliding distance, but there was no direct relationship between wear and hardness. The tribological performance of these coatings appears to be dictated by a) the composition of the substrate, b) the chemical and physical nature of the coatings and c) the test conditions. Under boundary lubricated conditions there was a considerable increase in the wear life of the coatings. A three dimensional surface texture is superior to a machined surface, in controlling contact conditions. There is an approximate linear relationship between coating thickness and wear life for electroless nickel alloys. These coatings predominantly fail by adhesion, plastic deformation and brittle fracture. A microscopic model for fracture of brittle materials, under both static and dynamic conditions for abrasive and adhesive wear correlates very well with the behaviour of these coatings. Analytical interpretation of adhesive wear was made by separately calculating the coefficient of wear "K" of the counterbodies. This information enables an improved understanding of the wear test itself to be added to the model of the wear mechanisms involved.
4
Bland, Marc Thompson. "Investigation of superplastic behavior in FSP 5083 aluminum alloy." Thesis, Monterey, Calif. : Naval Postgraduate School, 2007. http://bosun.nps.edu/uhtbin/hyperion-image.exe/07Jun%5FBland.pdf.
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Thesis (M.S. in Mechanical Engineering)--Naval Postgraduate School, June 2007.Thesis Advisor(s): McNelley, Terry R. ; Su, Jianqing. "June 2007." Description based on title screen as viewed on November 7, 2007. Includes bibliographical references (p. 47-48). Also available in print.
5
Balasundaram, Arunkumar. "Effect of stress state and strain on particle cracking damage evolution in 5086 wrought al-alloy." Thesis, Georgia Institute of Technology, 2001. http://hdl.handle.net/1853/14809.
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Maestas, Tracy A. "Study of processing and microstructure of a superplastic 5083 aluminum alloy." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2002. http://library.nps.navy.mil/uhtbin/hyperion-image/02Mar%5FMaestas.pdf.
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Wu, Weidong Aerospace & Mechanical Engineering Australian Defence Force Academy UNSW. "Fatigue crack propagation behaviour of welded and weld repaired 5083 aluminium alloy joints." Awarded by:University of New South Wales - Australian Defence Force Academy. School of Aerospace and Mechanical Engineering, 2002. http://handle.unsw.edu.au/1959.4/38663.
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Welding, as one of the most effective joining methods for metals, has been extensively applied in engineering usage for a long time. When cracks occur in the vicinity of weldments, weld repairs are frequently considered for crack repair to extend service life. In order to evaluate to what extent the weld repair has improved the fatigue life of a cracked welded structure, it is necessary to be able to determine the residual life of the cracked welded joint, as well as the life of the weld repaired joint. Both these assessments require that the fatigue crack growth data be available. The determination of crack propagation rates of welded and weld repaired structures is thus of paramount importance to implement a damage tolerant approach to structural life extension. However, since most studies on welded joints so far have concentrated on fatigue life evaluation, at the present time only limited information is available on crack propagation rates in welded joints, and virtually none on fatigue behaviour and crack propagation in weld repaired joints. This thesis has focused on examination of fatigue and crack propagation behaviour in as welded and weld repaired aluminium alloy 5083, a weldable marine grade alloy extensively used in construction of high speed ferries and aerospace structures. Crack growth rates were measured during constant amplitude fatigue testing on unwelded, as-welded and weld repaired specimens of 5083-H321 aluminium alloy. A 3-D finite element analysis was conducted to determine the stress intensity factors for different lengths of crack taking into account the three-dimensional nature of the weld profile. The effects of crack closure due to weld residual stresses were evaluated by taking measurements of the crack opening displacements and utilised to determine the effective stress intensity factors for each condition. Metallurgical examinations and fractography of the fracture surface were conducted using an optical microscope and SEM. It was found that crack growth rates in welded plates are of the same order of magnitude as those of parent material when effective stress intensity factors were applied. However weld repaired plates exhibit higher crack growth rates compared to those of unwelded and once-only welded plates.
8
Winsley, Robert. "Corrosion resistance of heat treated and friction stir welded aluminium alloy 5083-H116." Thesis, University of Birmingham, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.713399.
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Boydon, Juanito F. "Study of cavitation and failure mechanisms of a superplastic 5083 aluminum alloy." Thesis, Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2003. http://library.nps.navy.mil/uhtbin/hyperion/05Mar%5F.pdf.
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Harrell, James William. "Analysis of the transition in deformation mechanisms in superplastic 5083 aluminum alloys by orientation imaging microscopy /." Monterey, Calif. : Springfield, Va. : Naval Postgraduate School ; Available from National Technical Information Service, 2002. http://sirsi.nps.navy.mil/uhtbin/hyperion-image/01Sep%5FHarrell.pdf.
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Harrell, James William. "Analysis of the transition in deformation mechanisms in superplastic 5083 aluminum alloys by orientation imaging microscopy." Thesis, Monterey, California. Naval Postgraduate School, 2001. http://hdl.handle.net/10945/847.
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m alloys used in automotive, aerospace and military applications. Superplasticity requires fine grains with high-angle boundaries and resistance to failure by cavitation. OIM permits grain-specific orientation determination and quantitative assessment of the grain-to-grain disorientation distribution as well as grain size measurement in materials. The current work offers significant new insights into the development and response of superplastic microstructures; in particular, OIM data may be employed to delineate the transition from slip to grain boundary sliding in superplastic 5083 materials.US Navy (USN) author
12
Winarto. "Study of mechanical properties and weld metal porosity on mechanised MIG aluminium alloy 5083 weldments." Thesis, Swansea University, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.636671.
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Several AA-5083 welds were fabricated using the mechanical MIG welding process with different welding parameters and two different filler wires. The investigation focuses on the effect of welding variables such as current, welding speed, and heat input (linear energy) on mechanical properties and weld metal porosity in AA 5083 weldments. Image analyses was used to determine the percentage of weld porosity. Results shows that the weld porosity observed in all welds varies with welding parameters employed. The percentage of porosity decreases with increasing welding current range from 250 to 280 A, as it does as the welding speed increases from 8.33 to 11.24 mm/s. However, porosity increased with increasing heat input from 596 to 703 J/mm. Moreover, the percentage of porosity in welds with the ER5087 filler wire was considerably lower than that of welds with the ER55565A filler wire. All weldments had the UTS, the yield strength and elongation in the range of weld mechanical properties standard according to EN and ASTM Standard. The porosity appeared to have a much reduced effect on the strength of weldments. Analysis of the hardness profiles across the weld interface was employed for both welds using ER5556A and ER 5087 filler wire. The hardness values vary with welding parameters employed. The trend shows that increasing arc power input (Q=EI) by increasing welding current, produces increased erratic hardness distribution. Some welds with a high arc power input (Q) exhibit very low hardness (down to 30% of hardness of base metal) in a very narrow area, less than 1 mm width immediately adjacent to the weld interface. The fracture location for weldments with bead-on plate varied between the fusion line and the base metal. However, the fracture location for weldments with bead-off plate was generally at the weld zone. SEM photographs shows that the base metal and the HAZ fracture are ductile whilst the weld metal and the fusion line fracture are the mixed rupture between ductile and brittle. The optimum mechanised MIG welding parameters having a low net heat input and a low porosity for 5 mm thick AA5083 butt-welds using ER5556A filler wire comprised a welding current of 270 amperes, a welding speed of 10.5 mm/s and a net heat input 603 J/mm. For weldments using ER5087 filler wire, the optimum welding parameters consisted of a welding current of 271 amperes, a welding speed of 10.7 mm/s and a net heat input 609 J/mm.
13
Meredith, Gavin Simon. "Friction stir processing for the reversal and mitigation of sensitisation and intergranular corrosion in aluminium alloy 5083-H321." Thesis, University of Birmingham, 2014. http://etheses.bham.ac.uk//id/eprint/4932/.
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AA5083-H321 is an aluminum alloy commonly used in ship hull superstructures as it has a corrosion resistance which affords an excellent degree of protection in chloride-rich marine environments. Corrosion performance can degrade in a process called sensitisation, due to the precipitation of a β-phase onto grain boundaries with exposure to elevated temperatures over decades of service. Friction Stir Processing (FSP) has been evaluated as a method for locally reversing the degraded microstructure and removing a susceptibility to Intergranular Corrosion (IGC) in immersed and atmospheric conditions. Both the mechanical stirring and heat input to the plate by an FSP tool have been shown to remove the β-phase from grain boundaries which had been precipitated by a sensitisation heat treatment. Sensitisation was shown to cause intergranular corrosion of the alloy; however this susceptibility was removed after microstructural modification by FSP. A re-sensitisation treatment of the previously sensitised and FSP’d region was seen to precipitate coarser and more discrete β-phase particles onto grain boundaries, which corroded at a faster rate than the once-sensitised material under electrochemical testing. This indicates that corrosion resistance degrades more quickly with subsequent sensitisation.
14
Krejza, Jan. "Kvalifikace postupu svařování hliníkové slitiny AW-5083 H111." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-399300.
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The diploma thesis deals with the qualification of welding process of aluminum alloy EN AW-5083 H111. This aluminum alloy was used to make a Venturi tube. Therefore, a literature review has been developed dealing with the properties and use of aluminum and its alloys. The next chapter deals with the weldability of aluminum, aluminum alloys and the weldability of EN AW-5083 alloy. Part of the work is devoted to the used TIG method and its specifics when welding aluminum materials. The practical part of the thesis deals with the actual qualification of welding procedures according to the relevant standard and evaluation of production conditions according to the product standard. The last chapter deals with the overall manufacturing process of the Venturi tube.
15
Brosi, Justin Keith. "Mechanical Property Evolution of Al-Mg Alloys Following Intermediate Temperature Thermal Exposure." Cleveland, Ohio : Case Western Reserve University, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=case1270163761.
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Thesis (Master of Sciences (Engineering))--Case Western Reserve University, 2010Department of Materials Science and Engineering Title from PDF (viewed on 2010-05-25) Includes abstract Includes bibliographical references and appendices Available online via the OhioLINK ETD Center
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Mutombo, Faustin Kalenda. "Corrosion fatigue behaviour of 5083-H111 and 6061-T651 aluminium alloy welds." Diss., 2012. http://hdl.handle.net/2263/25838.
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In addition to being one of the highest strength non-heat treatable aluminium alloys, magnesium-alloyed wrought aluminium 5083 displays excellent corrosion resistance and good weldability. Aluminium alloy 6061, alloyed with magnesium and silicon, displays high strength, excellent formability, adequate weldability and good corrosion resistance. These aluminium alloys find application in the ship building and transport industries where 5083 is often joined to 6061 to produce welded structures such as complex I-beams and semi-hollow or hollow channels. This project aimed at characterizing the hardness, tensile properties, corrosion behaviour and fatigue properties (in air and in a 3.5% NaCl solution) of aluminium 5083 and 6061 in the as-received and welded conditions. Plates of 5083-H111 and 6061-T651 aluminium, prepared with double-V or square butt joint preparations, were joined using semi-automatic or fully automatic pulsed gas metal arc welding (GMAW). The pulsed GMAW process allows close control over the welding arc and facilitates the use of lower average heat inputs, thereby improving the bead appearance and mechanical properties. During this investigation, three filler wires were evaluated, namely magnesium-alloyed ER5183 and ER5356 aluminium, and silicon-alloyed ER4043. Hardness measurements revealed a decrease in hardness in the weld metal of the 5083-H111 welds. Dressed welds failed in the weld metal during transverse tensile testing, whereas undressed (as-welded) specimens failed at the weld toe or weld root due to the stress concentration introduced by the weld geometry. Significant softening, attributed to the partial dissolution and coarsening of strengthening precipitates and recrystallization during welding, was observed in the heat-affected zones of the 6061-T651 welds. During tensile testing, failure occurred in the heat-affected zone of all 6061 welds. Welding reduced the room temperature fatigue life of all specimens tested. In the 5083 welds, fatigue cracks initiated preferentially at gas pores, lack-of-fusion type defects and second phase particles in dressed welds, and at the stress concentration presented by the weld toes or the weld root in undressed welds. In 6061 welds, failure occurred preferentially in the softened heat-affected zone of the welds. As a result of improved control over the weld profile and a lower incidence of weld defects, fully automatic welds consistently outperformed semi-automatic welds during fatigue testing. The presence of a corrosive environment (a 3.5% NaCl solution in this investigation) during fatigue testing reduced the fatigue properties of all the samples tested. Corrosion pits formed preferentially at second phase particles or weld defects, and reduced the overall fatigue life by accelerating fatigue crack initiation. CopyrightDissertation (MSc)--University of Pretoria, 2012.
Materials Science and Metallurgical Engineering
unrestricted
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Huang, Te-wei, and 黃德維. "Grain Refine and Super-Plastic of 5083 Aluminum Alloy." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/17419330469295596061.
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碩士國立中央大學
機械工程學系在職專班
101
The research adopts the material of AA5083-O sheet alloy to be the subjective and do several experiments for two materials—the rolling sheet alloy and the rolling sheet ally after annealing. With different mechanic tests for these two materials, we find some differences of AA5083-O sheet alloy before and after rolling and its related change of inner microstructure. For the rolling sheet alloy after annealing, we also do experiments of hardness, room-temperature tensile strength and high-temperature tensile strength. The research shows that the 5083 alloy can produce grain refining structure which is smaller than 10μm when it is processed by 90% rolling, 400℃ heating for 30 minutes and annealing. For high-temperature tensile strength experiment, the elenglation can achieve 413.33% which represents good quality of superplasticity
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Yang, Yi-lang, and 楊益郎. "Friction and Lubrication Effect in Rapid Forming of Superplastic Aluminum Alloy 5083." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/64354997310633505818.
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Ming, Huang Sin, and 黃信銘. "Study on Gas Forming of Superplastic 5083 and non-Superplastic 5083 Aluminum Alloy Sheet for Cell Phone Shell." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/quqdyn.
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碩士國立中央大學
機械工程學系
106
This thesis focuses on the application of quick plastic forming (QPF) process to the molding of metal cellphone shell. The experiments used different type of commercial 5083 and superplastic 5083 aluminum alloy sheet to carry out cellphone shell quick plastic forming at different times. Through a variety of mechanical properties and formability tests, to discuss the advantages of the quick plastic forming process to produce a cellphone shell, and which kind of sheet are more suitable as material for the quick plastic forming of cellphone shell. The results show that the effect of one stage quick plastic forming on the complete forming is the design of the mold, rather than the mechanical properties of material, and the mechanical properties of material is not much difference before and after forming. Based on the above results, it can be inferred that in order to make cellphone shell efficiently using the quick plastic forming process in aspect of economy and time, commercial 5083 sheet is the better choose for material.
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Liu, Chao-Chin, and 劉兆欽. "Effect of Welding Speed of Friction Stir Welding on Mechanical Properties and Microstructure for 5086 Aluminum Alloy." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/80704876259068089993.
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碩士崑山科技大學
機械工程研究所
98
The study investigates mechanical properties and microstructure effect for 5086 aluminum alloy with different welding speed of friction stir welding. The 5086 aluminum alloy has good corrosion resistance and welding quality, which often used in the construction of the ship, shipping industry and places that contain some rich-salt regions. Now when we use aluminum alloy to build equipment of ship, there are many factors to consider, for example, the cost of production, the portion of working parts and the limitation of working environment. Therefore, we usually use gas tungsten arc welding（GTAW）and inert gas metal arc welding（GMAW）to proceed the operation of welding. But the input heat affected the properties of base metal and induced the welding defects for the both of welding methods. In order to acquire the welding workpiece with higher quality, we investigate the influence of mechanical properties with different welding speed for FSW, and then select the proper welding speed for Al maternal and ensure the quality of welding parts. Firstly, the welding process is employed with different welding speeds for the workpiece, and then X-ray is used to examine the welding quality. Based on the tensile experiment, metallographic observation, hardness measurement and fractography analysis of tensile test, after welding the FSW with different welding speeds for 5086 AL alloy is investigated. This study is then conducted on the variation of the mechanical properties and microstructure of the workpiece of welded nugget, the thermo mechanically affected zone（TMAZ）, the heat affected zone（HAZ）and the base material. Based on the results of experiment, the less petal-pattern materials are spilled in two side edge of welding path, the less defects are occurred. And the distribution of hardness on the cross-section of welding path is U-shape. The minimum hardness occurs between HAZ and TMAZ. And the hardness in the nugget region is higher than those in the HAZ. But the hardness in the nugget region is lower than the base metal. The SEM is employed to observe the fractography of tensile for each experiment, the fracture with dimple structure is ductile failure.
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Jin, Sin-Fu, and 金信甫. "Study on the Mechanical Properties and Microstructure of the 5086 Aluminum Alloy Thin Sheets Using Micro-FSW." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/62841541430091433133.
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碩士崑山科技大學
機械工程研究所
99
Friction stir welding for the solid-state welding process, superior to conventional gas tungsten arc welding and inert gas metal arc welding, 5086 aluminum alloy specimen used as the base material, 5xxx series has excellent high strength, corrosion resistance, can be used in aircraft, automobiles , 3C products ship the parts and components within the housing. The experimental design their own stir welding machine to spindle speed 6000,7200,8400,9600 rpm, feed rate 30,60,300,600,1200 mm / min, shaft shoulder diameter 8mm, 5mm of thickness of 2mm, 1mm welding, and for weld crest spacing measurements, metallographic observation of microstructure, hardness measurements, to explore the different processing parameters, the changing nature of the specimen. Experimental results revealed that the spindle in the case of high-speed processing defects, the feed rate faster forward side of the weld in a row and there is no worm holes filled with produce, both sides of the petal pattern reduced, the feed rate in 300mm/min fill the surface of the weld was better than better than the other parameters. Measuring the results of the peak spacing, the faster feed rate with the greater distance between peaks, the smaller the distance between wave speed faster. Hardness of the specimen cross-section measurements that the low feed rate is more low-weld hardness of the nuclear area, with the feed rate increased the average hardness of weld nucleus increasing trend.
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Shen, Yi-Feng, and 沈義峯. "Research In Superplastic Aluminum Alloy 5083 Applied To Wing's Leading Edge Fairing Covers." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/46883885674739799806.
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碩士國立中央大學
機械工程學系在職專班
102
The purpose of this research is to evaluate the use of superplastic forming technology, in the production of the mid-sized Boeing 737 airliners leading edge fairing, as part of the wing’s construction. I will demonstrate the implementation of different air pressures used during the forming process of these superplastics (such as general superplastic forming, rapid superplastic forming and low pressure superplastic forming over a long period of time).I will then observe the change in the microstructure of superplastic 5083 after superplastic forming processes due to the variation in conditions when forming. The material used for the research is superplastic aluminum alloy 5083 as the starting material. This superplastic has a fine grain structure. The fine grain structure will be converted into a coarse grain structure when exposed to a high-temperature environment over a long period of time. In general, during the forming process, the properties of the resultant molded materials grain structure is altered due to the plastic deformation caused by the materials grain boundary sliding when exposed to high temperatures. However, if the grain boundary slides to a certain degree, cavity can be generated within the material. By exploring the use of three different air pressures during the forming process of the aircrafts leading edge fairing construction, in conjunction to analysis of the resultant component, regarding grain coarsening phenomenon and void generation within the material, we are able to conduce valuable information, concerning the impact of the forming process on the materials microstructure. From this, it is then possible to deduce the perfect processing conditions for superplastic forming, whilst retaining continuity in the formed articles thickness distribution.
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Weng, Cheng-hsien, and 翁正諴. "Superplasticity Effect Demonstrated by Gas Forming Superplastic 5083 and non-Superplastic 5052 Aluminum Alloy." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/95706334888953043947.
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碩士國立中央大學
機械工程學系
102
This thesis focuses on using superplastic forming to manufacture the aluminum "Airplane Fairing Cover" used on an actual commercial airliner. General superplastic forming usually uses flat sheet to produce symmetrical and less depth-width shape contour, however, the complicated and non-symmetrical work pieces are rarely produced by using superplastic forming. The sheet contour deform is large when flat sheet do the bending process, because fairing cover forming mold have complex shape, high aspect-ratio and the mold V-shape is deeper than middle saddle zone. Finally, wrinkle phenomenon occur in the forming results, and it is occur inside the cutting line area (Ending Opposite Position, EOP) of the product. In order to get the best forming result (i.e. fairing cover) and solve this problem, several improvement are perform, such as: blow with different P-T curve conditions, different material and material thickness usage (AA5052 and SP5083) and reduce the depth of V-side by modify mold (by add pads to reduce the mold cost).
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許志斌. "A Study on the Post-Welding Corrosion Behavior of 7005 and 5083 Aluminum Alloy." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/40718859412965711665.
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碩士國立臺灣科技大學
機械工程系
88
The objective of this study is to investigate the effect of residual stress, produced by TIG and MIG dissimilar material welding, on the corrosion behavior of AA7005 and AA5083 aluminum alloys. This study contains two parts. The first part is the measurement of the HAZ’s residual stress, in accordance with the ASTM E837-96. The second part is the measurement of polarization curve, in accordance with the ASTM G5-94. Results from both measurement were compared to find a correlation between residual stress and corrosion behavior. Experimental results showed that the residual stress at HAZ in AA5083 side is higher than that in AA7005 side for MIG dissimilar material welding. But in TIG dissimilar material welding the result is reverse. Shrink end has larger residual stress variation than the start end, and MIG welding process produces higher residual stress variation in direction perpendicular to the weldment than that produced by TIG welding process. AA7005 base metal have tensile residual stress from 8.6Mpa to 19.5Mpa in the direction parallel to extrusion direction. A large variation in polarization curves was observed for the base metal of AA7005 aluminum alloy. The reduction potential (Icorr) is varied from -1.075(V) to —0.824(V), and the corrosion current density (Jcorr) is varied from 3.98×10-8A/cm2 to 1.7×10-6 A/cm2. These residual stresses in accompany with the variations of alloy elements, Zn, Mg, are the major reasons for the large variation of Icorr and Jcorr obtain from the polarization curves of AA7005 base metal. Polarization curves obtained from materials on AA5083 side HAZ did not showed passivation zone in TIG dissimilar material welding, but passivation zone was observed for materials obtained from AA5083 side HAZ in MIG dissimilar material welding. This result showed that the corrosion behavior of AA5083 side HAZ material was changed after MIG dissimilar material welding. The reduction potential (Icorr) obtained from material on AA5083 side HAZ is —0.98V and —0.923V respectively, those values are much lower than that of base metal. The corrosion current density (Jcorr) on AA5083 side HAZ is 6.6×10-7A/cm2 and 3.16×10-6A/cm2 respectively, those values are much higher than the corrosion current density (Jcorr) of base metal after TIG and MIG dissimilar material welding. This result showed that residual stress may form local galvanic cell and alters the corrosion behavior of AA5083 aluminum alloy, causing a change in polarization curve, decreasing reduction potential and increasing the corrosion current density.
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MotsI, Glenda Tsholofelo. "In-situ scanning electron microscopy studies on the uniaxial tensile deformation mechanisms in Aluminium alloy 5083." 2014. http://encore.tut.ac.za/iii/cpro/DigitalItemViewPage.external?sp=1001710.
Full textAbstract:
M. Tech. Metallurgical Engineering.Aims to study tensile deformation mechanisms of aluminium alloy 5083 using in situ SEM techniques. The objectives to achieve this aim are: to investigate the effect of strain rate on mechanical properties ; investigating anisotropy mechanical properties at varying strain rates ; investigating microstructure anisotropy behaviour at varying strain rates and to investigate the influence of intermetallic particles during tensile deformation.
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Chuang, Wei-Chih, and 莊惟智. "A study on the tensile properties of 5083-O and friction stir processed 5083-FSP aluminum alloy from room temperature to 450℃." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/68626867889411175823.
Full textAbstract:
碩士國立成功大學
材料科學及工程學系碩博士班
96
The 5083 aluminum alloy (Al-4.3Mg) is widely used for many application in automotive, marine, aircraft body sheet due to its excellent combination of strength, corrosion resistance, weldability and low cost. Nowadays, it is also used in the LCD industry as the heating plate of the LCD glass substrate. Therefore, besides the welding problem, it will also encounter the trial of being used under different temperature condition. In this study, annealed aluminum alloy of 5083, called 5083-O, is processed by friction stir process (FSP). 5083-O and 5083-FSP are both tested by tensile test at different temperature (from room temperature to 450℃), and by constant initial strain rate (1.67×10-3 sec-1). The tensile properties of stirring zone at different temperature will be discussed. In the microstructure of 5083-FSP, the stirring zone has equal-axial recrystallized grains in contrast with the elongated grains in 5083-O. After the tensile test, we define three temperature regions owing to the difference between the engineering stress-strain curves: Low Temperature (LT, RT~100℃), Intermediate Temperature (IT, 150℃~ 250℃) and High Temperature (HT, 300℃~ 450℃). In LT, the curves are characterized by the serrated flow curve due to the effect of dynamic strain ageing (DSA); In HT, the curves are characterized by the wavy flow curve as a result of the occurrence of dynamic recrystallization (DRX). As to IT, the serrated flow curve disappears in this region, the curve is smooth with a bit of fluctuation; therefore, IT might be the transition area between DSA and DRX. In LT, the critical strain of 5083-FSP is lower than 5083-O at the same temperature. At room temperature, the stress drop of 5083-FSP is higher than that of 5083-O. It indicates that, DSA effect is much more obvious in 5083-FSP at room temperature. The tensile properties of 5083-O and 5083-FSP have similar tendency toward the variation in temperature. The yield stress (YS) and ultimate tensile strength (UTS) decrease with the increasing temperature. but YS is very near before 200℃and UTS is very near before 100℃. The uniform elongation (UE) increases with increasing temperature before 100℃ and decreases with increasing temperature after 100℃. The total elongation (TE) is near before 100℃ and after that TE increases with increasing temperature. 5083-FSP even shows high elongation over 200% at temperature higher than 400℃.
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CHENG, JEN-CHAN, and 鄭任展. "Study on the Production of 5083 Aluminum Alloy Mobile Phone Case by Quick Plastic Forming (QPF)." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/72t6ks.
Full textAbstract:
碩士國立中央大學
機械工程學系
107
The paper is based on Quick Plastic Forming (QPF), which is made of 5083 aluminum alloy and superplastic 5083 aluminum alloy to make metal mobile phone casing. The experimental research discusses the fastest time to blow different thickness AA5083 coffins and compare them. The differences between AA5083 and SPF5083 materials are observed and discussed in terms of microstructure. The differences between AA5083 general grain and SPF5083 fine-grained materials are discussed. The thickness and uniformity of the raw materials and processed materials are discussed in various mechanical properties. Size results to explore and evaluate the fastest and most efficient blowing time. The experiment is mainly divided into three parts, the first part is to discuss AA5083 aluminum alloy 0.8mm material, the second part is to discuss AA5083 aluminum alloy metal material 0.6mm material, the third part is to discuss AA5083 and SPF5083 aluminum alloy 0.9mm aluminum alloy metal material and integrate The effect of each part time on size and thickness uniformity.
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Su, Jui-Chieh, and 蘇瑞杰. "The Study on Friction Stir Welding of 5083-H321 Aluminum Alloy Plates Using Non-Tilt Tools." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/09483521211591518931.
Full textAbstract:
碩士國立中興大學
材料科學與工程學系所
105
5083-H321 aluminum alloy with advantages of low density, medium strength, and corrosion resistance, is widely used in marine applications such as ships, auto parts, aircraft welding parts, subway tracks, drilling. and so on. In order to meet the needs of the domestic industry such as cost down and automatic production, this study was conducted with a 4 mm thin plate friction stir welding (FWS) by using a non-inclinating stirrer process with an automated CNC (Computerized Numerical Control) machine, In this study, the 5083-H321 aluminum alloy test piece, completed by friction stir welding, was subjected to the examinations of welding bead surface and welding bead section. Finally, the qualified weld test piece was analyzed and compared with the substrate of raw material, including tensile tests, metallographic observations, Vicker hardness tests, X-ray diffraction, SEM, EDS and electrochemical corrosion tests. In the tensile test, the yield strength and the elastic coefficient welding bead are greater than that of the substrate, and the resisting ability of axial deformation is larger than the substrate. In the metallographic test, it is observed that the grain in the welding bead is finer after the friction stir welding. Verified by Hall-Petch equation. The yield strength of finer grain sized material is better, and so it the hardness. Since the fracture is found at the substrate, it is speculated that the higher the hardness, the stronger the strength is. The diffraction intensity ratio of (111) to (200) is varied and observed by X-Ray diffraction, indicating that the rolled 5083-H321 aluminum alloy has a preferential orientation and then back into random orientation after welding. From the energy dispersive X-ray spectroscopy(EDS), it is found that there are (MnFe)Al6 precipitates in the welding bead, leading to the increasing strength and the slightly decreasing corrosion resistance of the welding bead. Finally, the weld mechanical properties such as hardness and strength of 5083-H321 aluminum alloy 4 mm sheet through the tipless mixing head process FWS are better than the substrate, while the related corrosion resistance of the welding bead is deteriorated slightly. It is concluded that under the appropriate welding parameters, it is feasible to set the appropriate friction stir welding process without tilting the mixing head.
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Lin, Jia-Wei, and 林家偉. "Studies on the Effects of Welded Properties of Tool Geometries of Micro Friction Stir Welding for 5086 Aluminum Alloy Thin Sheet." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/78394273818315374796.
Full textAbstract:
碩士崑山科技大學
機械工程研究所
103
Friction stir welding(FSW) was the solid state welding process, it could be welded the materials under their melting point. The one of features of FSW had the stirring property in the welding mechanism for the welding morphology. However, the stir tools in the welding process were influenced by the plastic flow and temperature for the welded materials, and cause the change of mechanical properties. After Micro-Friction Stir Welding(Micro-FSW), the welded joint had the better mechanical properties. And Micro-FSW technology was aimed to welding the thin sheets with the thickness less 2mm. The design of process parameters and stir tools geometries will be more serious than traditional FSW process. Therefore, the investigation of the design of stir tools geometries was very important and necessary for the effect of welding properties for Aluminum thin sheets. In this study, the more suitable process parameters with the high rotational speed and high welding speed of the stir tools geometries of Micro-FSW for thin sheet with thickness of 1mm were investigated. Based on the experimental results of this study, the stir tools shoulder with diameter (D) and pin ratio of the diameter (d) for (D/d) was 4, the cylindrical pin diameter with 1mm, pin length with 0.9mm, it could get better weld morphology and higher tensile strength (100.33MPa) under the welding speed 48mm/min and rotational speed 15600rpm. And the influences of changing the minor diameter of tapered-shape pin for the quality of weld morphology were studied. When the minor diameter of tapered-shape pin was 1mm, the weld morphology was smoother and tensile strength was higher (58.84MPa).
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Lo, Ping-Yao, and 羅秉堯. "Studies of Effects of Process Parameters on the Mechanical Properties of Micro Friction Stir Welding for 5086 Aluminum Alloy Thin Sheet." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/90695294610924381542.
Full textAbstract:
碩士崑山科技大學
機械工程研究所
103
Due to the current requirements precision increase thinner, lighter weight of 3C products parts, while the friction stir welding technology for mobile phones, tablet, notebook computers and other aluminum shell of the bonding process. Because of the engagement plate thickness is less than 2 mm, then the friction stir welding process called micro friction stir welding process. When the thickness of plate increased, micro friction stir welding process parameters affect will be different. Therefore, this study for 5086 aluminum alloy sheet thickness of 1mm, using micro friction stir welding method, in high rotational speed and high welding speed machining parameters of joint process experiments. After different rotational speed and welding speed welding process, to find the effect on the mechanical properties. In this study, the experiments using micro friction stir welding machine, change the rotational speed (14400rpm, 15600rpm, 16800rpm, 18000rpm, 20400rpm) and welding speed (12mm / min, 24mm / min, 36mm / min, 48mm / min, 60mm / min), the implementation of micro friction stir welding process, and for weld morphology observation and tensile test, to study the changes of different processing parameters on the properties of the specimen. Based on the experimental results that low rotational speed due to lack of heat generated by the friction of rotation, should be used with low welding speed so that the heat increase, more good surface quality weld. And the high rotational speed of the friction generated by the rotation with more heat, high welding speed should be used with make reduce heat, weld surface is no obvious defects. Whereby 5 groups welded test pieces can be observed best surface quality conditions with processing parameters, rotational speed of 14400 rpm, welding speed 12 mm / min, the rotational speed of 15600 rpm, welding speed 12, 24 mm / min, the rotational speed of 16800 rpm, welding speed 24, 36, 48 mm / min, the rotational speed of 18000 rpm, welding speed 36, 48, 60 mm / min, the rotational speed of 20400 rpm, welding speed of 48, 60 mm / min, this group is the preferred of several weld surface quality welding process parameters, whereby several groups of preferred weld surface of test pieces quality welding process parameters, can form the best surface quality and processing parameters with conditions. Based on the tensile test experimental results that experimental group test piece breaks located between the weld heat affected zone forward and the side of the heat-affected zone, with stirring tool rotational speed increases, the tensile strength enhanced the phenomenon.
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林榮立. "Effect of Manufacture Parameters of Friction Stir Welding on the Joining Properties of 5083-O Aluminum Alloy." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/58577320873862059889.
Full textAbstract:
碩士國立臺灣師範大學
工業教育學系
93
Abstract Friction stir welding (FSW) is an emerging solid-state joining process that produces low-distortion, high-quality, low-cost welds. The welding properties of aluminum alloys may be ameliorated by the friction stir welding technology. The objective of this study is to demonstrate the feasibility of FSW for joining of 5083-O aluminum alloy by different welding conditions. To produce high integrity welds, the process variables (RPM and material of the shoulder-pin assembly, traverse speed), the tilt angle and the tool pin design of friction stir welding must be chosen carefully. Microstructures of the welds will be examined using optical microscopy (OM). The best joining and mechanical properties of friction stir welding of Al alloy were elucidated about the effect of process variables. According to the experimental results of microstructure examination and microhardness test, the fine recrystallized grains in the stir zone and the elongated grains in the thermo-mechanical affected zone were created during friction stir welding. The hardness in the stir zone is the highest, the thermomechanically affected zone (TMAZ) and the base metal is lower. In proper welding conditions, the width of TMAZ zone decreases with increasing of the welding speed. Furthermore, the better joining quality can be achieved by the proper manufacture parameters. According to the analysis of tensile tests, the proper range of FSW parameters (ΘFSW) are from 3.1 to 9.2.
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Hsin-Ching and 楊欣璟. "Effect of Post-weld Heat Treatment on the Mechanical Properties of Dissimilar Aluminum Alloy 5083 and 7005 TIG welds." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/6z9ggc.
Full textAbstract:
碩士國立中央大學
機械工程學系在職專班
106
Because of the high specific strength and good corrosion aluminum alloys have been used extensively since the period of energy crises. Aluminum has greater thermal conductivity and larger thermal expansion than steels. Therefore, the weldability of aluminum alloys is not as good as steels. It is very important to study the weldability of dissimilar joint of aluminum alloys. The purpose of this research was to systematically study the weldability of aluminum alloys under Tungsten Inert Gas Arc Welding (TIG). The base metals used were 5083 and 7005 with filler metal of ER5183. Different post weld heat treatments of the weldments were conducted. A series of experiments including tensile test, microhardness test, optical metallography and SEM analysis were used to determine the releationship between mechanical properties and microstructures of the alumimum weldments. The experimental results indicate that there is no obvious difference between the 5083 weldments because they are non-heat-treatable aluminum alloys. Proper post weld heat treatment (full heat treatment) can increase the mechanical properties of the 5083-7005 dissimilar weldments. Post weld full heat treatment has a great influence on mechanical properties of the heat-affected zone of 7005 weldment.
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yang, chia-wei, and 楊佳偉. "The study of the Wear-Corrosion Properties of the Electroless Ni-P Nanoparticles Composite Coatings on 5083 Aluminum Alloy." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/92164234861230364188.
Full textAbstract:
碩士清雲科技大學
機械工程研究所
98
The purpose of this study is to evaluate the corrosion and wear-corrosion resistance properties of electroless Ni/nano-TiO2 and Ni/CNT plated nano-composite coatings on AA5083 alloy in 3.5 wt.% NaCl solution. The nano-composite coatings were prepared by electroless plating method that the nano-TiO2 (15 nm) and Carbon nano-tube (CNT, 5nm) particles were added into the eletroless Ni plating solution with a low and a high concentration of 1 g/L and 10 g/L for comparison, respectively. The corrosion resistance properties of the nano-composite coatings were examined by both potentiodynamic polarization and immersion corrosion test. The experimental results indicated that both Ni/nano-TiO2 and Ni/CNT nano-composite coatings exhibited an uniform and a compact surface morphology, not only improving the corrosion and wear-corrosion resistance of the AA5083 Al-Mg alloy but also superior to the electroless Ni-P coating. Both the corrosion and wear-corrosion resistance of the nano-composite coatings were enhanced significantly at high concentration of 10 g/L, in addition that the CNT added was superior to the nano-TiO2 added electroloss plating solution.