Log in

Relevant bibliographies by topics / AA 2024 / Journal articles

To see the other types of publications on this topic, follow the link: AA 2024.

Journal articles on the topic 'AA 2024'

Author: Grafiati

Published: 4 June 2021

Last updated: 6 September 2023

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 journal articles for your research on the topic 'AA 2024.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Liu, Z., P. H. Chong, A. N. Butt, P. Skeldon, and G. E. Thompson. "Corrosion mechanism of laser-melted AA 2014 and AA 2024 alloys." Applied Surface Science 247, no. 1-4 (July 2005): 294–99. http://dx.doi.org/10.1016/j.apsusc.2005.01.067.

Full text

APA, Harvard, Vancouver, ISO, and other styles

2

Sheppard, T. "Extrusion of AA 2024 alloy." Materials Science and Technology 9, no. 5 (May 1993): 430–40. http://dx.doi.org/10.1179/mst.1993.9.5.430.

Full text

APA, Harvard, Vancouver, ISO, and other styles

3

Jha, A. K., K. Sreekumar, and S. Arumugham. "Failure of AA 2024 Aluminium Alloy Rivets / Schäden an Nieten aus einer AA 2024 Aluminiumlegierung." Practical Metallography 33, no. 5 (May 1, 1996): 264–72. http://dx.doi.org/10.1515/pm-1996-330508.

Full text

APA, Harvard, Vancouver, ISO, and other styles

4

Galisson, Sébastien, Denis Carron, Philippe Le Masson, Georgios Stamoulis, Eric Feulvarch, and Gilles Surdon. "Hardness Prediction of AA 2024-T3 FSW Weld." Materials Science Forum 1016 (January 2021): 1857–62. http://dx.doi.org/10.4028/www.scientific.net/msf.1016.1857.

Full text

Abstract:

The hardness of AA 2024 is mainly dependent of the precipitation state in the material. This one will vary through the process of friction stir welding (FSW) which generates heat and deformations. The most important effect will be the thermal excursion which greatly affects the nature and the distribution of precipitates and so the mechanical properties of the material. Three Myhr & Grong-type submodels have been used in this study in order to simulate the variation of hardness in AA 2024-T3 FSW welds. These models allowed to simulate the hardening by growth of S-precipitates and the softening by coarsening and dissolution of GPB zones / co-clusters or S-precipitates. Finally, the natural ageing was taken into account following the Robson model. The complete model has been calibrated with isothermal data found in the literature and still has to be optimised. Nevertheless, preliminary results show the coherence of the model when performed on isothermal data. The model has been also applied to predict FSW hardness profiles that are compared to those found in the literature.

APA, Harvard, Vancouver, ISO, and other styles

5

Lundvall, O., M. Gulppi, M. A. Paez, E. Gonzalez, J. H. Zagal, J. Pavez, and G. E. Thompson. "Copper modified chitosan for protection of AA-2024." Surface and Coatings Technology 201, no. 12 (March 2007): 5973–78. http://dx.doi.org/10.1016/j.surfcoat.2006.11.005.

Full text

APA, Harvard, Vancouver, ISO, and other styles

6

Sadeesh, P., M. Venkatesh Kannan, V. Rajkumar, P. Avinash, N. Arivazhagan, K. Devendranath Ramkumar, and S. Narayanan. "Studies on Friction Stir Welding of AA 2024 and AA 6061 Dissimilar Metals." Procedia Engineering 75 (2014): 145–49. http://dx.doi.org/10.1016/j.proeng.2013.11.031.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Turkoz, Mevlut, Murat Dilmec, and Huseyin Selcuk Halkaci. "Investigation on Earing Behavior of AA 2024-T4 and AA 5754-O Aluminum Alloys." Advanced Materials Research 264-265 (June 2011): 12–17. http://dx.doi.org/10.4028/www.scientific.net/amr.264-265.12.

Full text

Abstract:

Deep drawn parts usually have different wall heights because of earing behavior. This behavior is due to the planar anisotropy (Δr) of sheet metals. A measure of the variation of normal anisotropy with the angel to the rolling direction in sheet plane is known as planar anisotropy. If the magnitude of the planar anisotropy is relatively large as absolute value, the earing behavior becomes more effective so larger ears occur. Furthermore, the orientation of the sheet with respect to the die or the part to be formed will be important. In addition, cutting of scraps in the parts which have ears leads to material waste. The scope of this study is to determine the planar anisotropy of AA 5754-O and AA 2024-T4 aluminum alloys and to investigate the earing behavior by the way of deep drawing of cylindrical cups.

APA, Harvard, Vancouver, ISO, and other styles

8

Papadopoulos, Michael, Sergio Tavares, Marco Pacchione, and Spiros Pantelakis. "Mechanical behaviour of AA 2024 friction stir overlap welds." International Journal of Structural Integrity 4, no. 1 (March 2013): 108–20. http://dx.doi.org/10.1108/17579861311303663.

Full text

APA, Harvard, Vancouver, ISO, and other styles

9

Chang, S. C., C. A. Huang, S. Y. Yu, Y. Chang, W. C. Han, T. S. Shieh, H. C. Chung, et al. "Tube spinnability of AA 2024 and 7075 aluminum alloys." Journal of Materials Processing Technology 80-81 (August 1998): 676–82. http://dx.doi.org/10.1016/s0924-0136(98)00174-5.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Nugroho, Fajar. "PENGARUH RAPAT ARUS ANODIZING TERHADAP NILAI KEKERASAN PADA PLAT ALUMINIUM PADUAN AA SERI 2024-T3." Angkasa: Jurnal Ilmiah Bidang Teknologi 7, no. 2 (September 13, 2017): 39. http://dx.doi.org/10.28989/angkasa.v7i2.147.

Full text

Abstract:

Aluminum alloy AA 2024-T3 is widely applied in the aircraft industry because it has good mechanical properties such as; light weight, good conductivity and the corrosion resistance. However Aluminium 2024-T3 susceptible to wearing. One method to improve the wear resistance o f AA 2024-T3 is the anodizing process. The aims of this research to study the effect of current density and anodizing time against the hardness of aluminum alloy AA 2024-T3. The process of anodizing was carried out using 10 percent sulfuric acid solution with the current density of 1.5 Ampere per decimeters square, 3.0 Ampere per decimeters square and 4.5 Ampere per decimeters square with immersion times of 30, 40, 50 and 60 minutes. Furthermore, the surface hardness was measured by using the Vickers hardness test method. As the supporting data the composition of the test conducted, testing the microstructure, and vickers hardness test. This study shows that the surface hardness of aluminum alloy AA 2024-T3 is influenced by the current density and anodizing time with varying values. Its shows that higher current density o f the anodizing caused optimal time tends to be short. The longer anodising time it will produce greater layer of aluminum oxide.

APA, Harvard, Vancouver, ISO, and other styles

11

M. Mohammed, Saraa, and Sahib M. Mahdi. "EFFECT OF PRECIPITATION HARDENING ON CORROSION BEHAVIOR FOR ALUMINUM ALLOYS 2024 AND 6061 IN 0.5M HCL." Journal of Engineering and Sustainable Development 25, Special (September 20, 2021): 2–39. http://dx.doi.org/10.31272/jeasd.conf.2.2.6.

Full text

Abstract:

The corrosion behavior of both AA 2024 and AA 6061 aluminum alloys in 0.5M HCl before and after solution treatment at room temperature (25 oC) was investigated in this paper to know the effect of the solution heat treatment on the corrᴏsion behavior of both 2024 and 606 aluminum alloys. Using the cyclic polarization test, the corrosion resistance of AA 2024 aircraft aluminum alloy decreases after solution treatment at 495 oC for 2hr from (9.490×10-3 mm/y) to (1.309×10-3 mm/y), while the corrosion resistance of AA6061 aircraft aluminum alloy decreases after solution treatment at 530 oC for 2hr from (886.3× 10-3 mm/y) to (1.270×10-3 mm/y). Pitting corrosion was the prevalent type of corrosion for both alloys.

APA, Harvard, Vancouver, ISO, and other styles

12

Ozay, Cetin, and Omer Etem Karlidag. "Hot press sintering effects and wear resistance of the Al-B₄C composite coatings of an AA-2024 alloy." Materials Testing 63, no. 12 (December 1, 2021): 1150–56. http://dx.doi.org/10.1515/mt-2021-0057.

Full text

Abstract:

Abstract In this study, the surface of AA-2024 alloy substrate was coated with an Al-B4C reinforced composite using hot press sintering. Al and B4C powders were synthesized by mechanical alloying. To this end, four samples were prepared. As a reference sample, AA-2024 substrate was coated with pure Al powder under 110 MPa pressure. In the other samples, the AA-2024 substrate was coated with metal matrix composites (MMCs) contained in Al-5 wt.-% B4C at 90, 110 and 130 MPa. The microstructure of the transition zone formed between the AA-2024 substrate and the coating layer of the coated samples, the microstructure of the Al/B4C MMCs coating, the macro hardness, the linear reciprocating and forth wear resistance of the coating layer were investigated. In addition, an optical microscope (OM), scanning electro microscope (SEM) images and EDS analysis of the microstructure were used. It was observed that the B4C powders were homogeneously distributed in the Al matrix in the microstructure of the coating layer. It was also found that the gaps between the grains in the microstructure of the coating layer and their size decreased with an increase in pressing pressure. Accordingly, it was concluded that macro hardness increased and weight loss decreased.

APA, Harvard, Vancouver, ISO, and other styles

13

Delaunois, Fabienne, Edwin Denil, Yves Marchal, and Véronique Vitry. "Accelerated Aging and Portevin-Le Chatelier Effect in AA 2024." Materials Science Forum 879 (November 2016): 524–29. http://dx.doi.org/10.4028/www.scientific.net/msf.879.524.

Full text

Abstract:

AA2024 aluminium alloy is used in aeronautics for various applications. However, the aging treatment (“T4 temper”) at ambient temperature used to bring it to optimal mechanical properties causes several problems. The main one is its duration (5 days) which brings the need for storage of the parts. Moreover temperature control during such a long period is difficult.The aim of this work was to develop an alternative treatment leading to optimized mechanical properties in a shorter time. For this, we investigated the kinetics of the aging process and observed the apparition and disappearance of “Portevin-Le Chatelier (PLC) effect” in AA2024 aluminium alloy.The knowledge of the time at which PLC effect is observed is important in terms of process because shaping may be carried out before the end of the aging process.

APA, Harvard, Vancouver, ISO, and other styles

14

Vidyasagar, CH S., and D. B. Karunakar. "Development of 2024 AA-Yttrium composites by Spark Plasma Sintering." IOP Conference Series: Materials Science and Engineering 346 (April 2018): 012050. http://dx.doi.org/10.1088/1757-899x/346/1/012050.

Full text

APA, Harvard, Vancouver, ISO, and other styles

15

Anthony Xavior, M., N. Ranganathan, H. G. Prashantha Kumar, J. Joel, and P. Ashwath. "Mechanical properties evaluation of hot extruded AA 2024 –Graphene Nanocomposites." Materials Today: Proceedings 5, no. 5 (2018): 12519–24. http://dx.doi.org/10.1016/j.matpr.2018.02.233.

Full text

APA, Harvard, Vancouver, ISO, and other styles

16

Li, Xing, Bin Xiang, Xiu-li Zuo, Qin Wang, and Zi-dong Wei. "Inhibition of Tryptophan on AA 2024 in Chloride-Containing Solutions." Journal of Materials Engineering and Performance 20, no. 2 (June 8, 2010): 265–70. http://dx.doi.org/10.1007/s11665-010-9680-7.

Full text

APA, Harvard, Vancouver, ISO, and other styles

17

Hu, Tianhui, Hongwei Shi, Tao Wei, Fuchun Liu, Shihua Fan, and En-Hou Han. "Cerium tartrate as a corrosion inhibitor for AA 2024-T3." Corrosion Science 95 (June 2015): 152–61. http://dx.doi.org/10.1016/j.corsci.2015.03.010.

Full text

APA, Harvard, Vancouver, ISO, and other styles

18

Manasa, S., T. Siva, S. Sathiyanarayanan, K. V. Gobi, and R. Subasri. "Montmorillonite nanoclay-based self-healing coatings on AA 2024-T4." Journal of Coatings Technology and Research 15, no. 4 (May 18, 2018): 721–35. http://dx.doi.org/10.1007/s11998-018-0080-5.

Full text

APA, Harvard, Vancouver, ISO, and other styles

19

Zhu, Danqing, and Wim J. van Ooij. "Corrosion protection of AA 2024-T3 by bis-[3-(triethoxysilyl)propyl]tetrasulfide in neutral sodium chloride solution. Part 1: corrosion of AA 2024-T3." Corrosion Science 45, no. 10 (October 2003): 2163–75. http://dx.doi.org/10.1016/s0010-938x(03)00060-x.

Full text

APA, Harvard, Vancouver, ISO, and other styles

20

Kasman, Şefika, and Sertan Ozan. "Determination of Process Parameters for Friction Stir Welded Dissimilar Aluminum Alloys: AA 5083 and AA 2024." Practical Metallography 57, no. 7 (July 15, 2020): 448–74. http://dx.doi.org/10.3139/147.110608.

Full text

APA, Harvard, Vancouver, ISO, and other styles

21

Gandra, J., D. Pereira, R. M. Miranda, and P. Vilaça. "Influence of Process Parameters in the Friction Surfacing of AA 6082-T6 over AA 2024-T3." Procedia CIRP 7 (2013): 341–46. http://dx.doi.org/10.1016/j.procir.2013.05.058.

Full text

APA, Harvard, Vancouver, ISO, and other styles

22

Trueba, Monica, and Stefano P. Trasatti. "Pyrrole-Based Silane Primer for Corrosion Protection of Commercial AA 2024 T3." Advanced Materials Research 38 (March 2008): 14–26. http://dx.doi.org/10.4028/www.scientific.net/amr.38.14.

Full text

Abstract:

An alternative approach was developed for surface treatment of as-received commercial AA 2024 T3 by using a pyrrole-based silane (SiPy). For film deposition, just one immersion step is enough, followed by curing. SiPy layer structure contains both polysiloxane bonds and pyrrole oligomers, with some degree of doping, giving a highly coherent layer. The superior film quality with respect to simple polysiloxane, is probably the main reason for the better corrosion performance obtained for SiPy on 2024.

APA, Harvard, Vancouver, ISO, and other styles

23

Muruganandam, D., and Sushilal Das. "Mechanical and Bending Characteristics of Dissimilar Friction Stir Welded AA 2024 T6 - AA 7075 T6 Butt Joints." Indian Welding Journal 45, no. 3 (July 1, 2012): 54. http://dx.doi.org/10.22486/iwj.v45i3.141219.

Full text

APA, Harvard, Vancouver, ISO, and other styles

24

Muruganandam, D., and Sushilal Das. "Mechanical and Bending Characteristics of Dissimilar Friction Stir Welded AA 2024 T6 - AA 7075 T6 Butt Joints." Indian Welding Journal 45, no. 3 (July 1, 2012): 54. http://dx.doi.org/10.22486/iwj/2012/v45/i3/141219.

Full text

APA, Harvard, Vancouver, ISO, and other styles

25

Prasad, Koona Shiva. "MECHANICAL AND MICROSTRUCTURAL CHARACTERIZATION OF FRICTION STIR WELDED AA 6061 & AA 2024 DISSIMILAR ALUMINUM ALLOY JOINTS." International Journal of Advanced Research in Computer Science 8, no. 9 (September 30, 2017): 308–12. http://dx.doi.org/10.26483/ijarcs.v8i9.5060.

Full text

APA, Harvard, Vancouver, ISO, and other styles

26

Pehlivan, Hüseyin. "Milling operation parameter optimization of AA 2024-T351 aluminum alloy material." Emerging Materials Research 11, no. 1 (March 1, 2022): 114–24. http://dx.doi.org/10.1680/jemmr.20.00272.

Full text

Abstract:

The expected quality indicator in the manufacturing industry is the surface roughness (R a). The effects of milling operation parameters on the axial forces and surface roughness of AA 2024-T351 alloy plate were studied. Experiments were carried out on an AA 2024 material using a Hartford four-axis computer numerical control vertical processing center machine and a carbide insert. Axial forces were measured by using a three-component cutting force dynamometer. R a values ranged from 0.2583 to 0.8833 μm and the cutting force from 76 to 305 N. Experimental results showed that cutting forces rose with an increase in cutting speed but R a values decreased with a rise in cutting speed. Also, the depth of cut was the commanding factor followed by spindle speed and feed per tooth. This indicated that cutting depth was the most important factor among the design parameters, followed by cutting speed and feed per tooth. Besides, the response surface methodology was used to investigate the milling parameters on R a and axial forces. Variance analysis was conducted to find the contribution of each component to the results of roughness and forces. Scanning electron microscopy analysis was also performed to see the abrasions on the cutting tool surface.

APA, Harvard, Vancouver, ISO, and other styles

27

GUNES, I., M. ERDOGAN, and B. ÇENGELCI. "Mechanical and electrical properties of artificially aged aluminium alloy AA 2024." Metallic Materials 54, no. 05 (2016): 379–87. http://dx.doi.org/10.4149/km_2016_5_379.

Full text

APA, Harvard, Vancouver, ISO, and other styles

28

Allahar, Kerry N., Dante Battocchi, Gordon Bierwagen, and Dennis Tallman. "Thermal Degradation of a Mg-Rich Primer on AA 2024-T3." ECS Transactions 19, no. 29 (December 18, 2019): 75–89. http://dx.doi.org/10.1149/1.3259800.

Full text

APA, Harvard, Vancouver, ISO, and other styles

29

Cabrini, Marina, Sara Bocchi, Gianluca D'Urso, Claudio Giardini, Sergio Lorenzi, Cristian Testa, and Tommaso Pastore. "Stress Corrosion Cracking of Friction Stir-Welded AA-2024 T3 Alloy." Materials 13, no. 11 (June 8, 2020): 2610. http://dx.doi.org/10.3390/ma13112610.

Full text

Abstract:

The paper is devoted to the study of stress corrosion cracking phenomena in friction stir welding AA-2024 T3 joints. Constant load (CL) cell and slow strain rate (SSR) tests were carried out in aerated NaCl 35 g/L solution. During the tests, open circuit potential (OCP) and electrochemical impedance spectroscopy (EIS) were measured in the different zones of the welding. The results evidenced initial practical nobilty of the nugget lower compared to both heat-affected zone and the base metal. This effect can be mainly ascribed to the aluminum matrix depletion in copper, which precipitates in form of copper-rich second phases. In this zones, no stress corrosion cracking was noticed, but well-evident stress-enhanced intergranular corrosion occurred. This is due to the uneven distribution of platic deformation during the slow strain rate tests. Higher strain values are localized at the heat affected zone, where softening occurs. On the contrary, stress values at the nugget are not sufficient to favor both the initiation and propagation of stress corrosion cracks. In the range of processing parameter studied in this experimental work, the stress corrosion cracking susceptibility of the friction stir welding (FSW)-ed alloy is then similar to that of the base metal.

APA, Harvard, Vancouver, ISO, and other styles

30

Kothasiri, Anupama Francy, Srinivasa Rao Chalamalasetti, and Gopalakrishnaiah Peteti. "MULTIPLE PROCESS PARAMETER OPTIMIZATION OF FORWARD EXTRUSION PROCESS ON AA 2024." International Journal of Modern Manufacturing Technologies 13, no. 2 (December 20, 2021): 63–75. http://dx.doi.org/10.54684/ijmmt.2021.13.2.63.

Full text

Abstract:

Extrusion is a simple metal forming process in which a block of metal is forced through a die orifice with a certain shape under high pressure. This extrusion process is influenced by many process parameters such as die angle (DA), ram speed (RS), coefficient of friction (COF), Extrusion ratio, Die land height, work piece diameter and length, material properties etc. In extrusion process, extrusion force is crucial parameter, the flow of metal and hence the extrusion force is significantly influenced by the above parameters which results in quality of the product. The present study numerically investigates the influence of major process parameters such as die angle, ram speed, coefficient of friction on the extrusion process. The AA2024 material is chosen as work piece material and the extrusion force and damage is considered as the output responses. The input process parameters are varied in three levels (Level - 1: 10° DA, 1.6mm/min RS, 0.06 COF; Level - 2: 20° DA, 3.2mm/min RS, 0.08 COF; Level - 3: 30° DA, 4.8mm/min RS, 0.01 COF). Numerical simulations are performed by using DEFORM 3D software. The simulations are conducted as per L27 orthogonal array. From the results it is observed that Increase of die angle, ram speed and coefficient of friction increases the extrusion force. The die angle has highest (86.45%) influence on the extrusion force, then after ram speed (6.60%). The coefficient of friction has insignificant influence (0.55%). It is also noticed that the damage is considerable after the 20° die angle. A multi parameter optimization is also done by using the Grey relation analysis by considering the equal weightage of extrusion force and damage. The optimum levels of input process parameters for the minimum extrusion force and damage is DA level 1, RS level 1, and COF level 3.

APA, Harvard, Vancouver, ISO, and other styles

31

Forero Sotomonte, S., C. Blanco Pinzon, and S. García Vergara. "Growth of PEO ceramic coatings on AA 2024-T3 aluminium alloy." Journal of Physics: Conference Series 687 (February 2016): 012037. http://dx.doi.org/10.1088/1742-6596/687/1/012037.

Full text

APA, Harvard, Vancouver, ISO, and other styles

32

Vuherer, T., J. Kramberger, D. Milčić, M. Milčić, and S. Glodež. "Fatigue behaviour of friction stir welded AA-2024 aluminium alloy sheets." IOP Conference Series: Materials Science and Engineering 659 (October 31, 2019): 012032. http://dx.doi.org/10.1088/1757-899x/659/1/012032.

Full text

APA, Harvard, Vancouver, ISO, and other styles

33

Rodošek, Mirjana, Matjaž Koželj, Lidija Slemenik Perše, Romana Cerc Korošec, Miran Gaberšček, and Angelja Kjara Surca. "Protective coatings for AA 2024 based on cyclotetrasiloxane and various alkoxysilanes." Corrosion Science 126 (September 2017): 55–68. http://dx.doi.org/10.1016/j.corsci.2017.06.011.

Full text

APA, Harvard, Vancouver, ISO, and other styles

34

Kasman, Ş., and S. Ozan. "Machinability of AA 2024 aluminum alloy by fiber laser engraving process." Materialwissenschaft und Werkstofftechnik 54, no. 5 (May 2023): 646–55. http://dx.doi.org/10.1002/mawe.202200146.

Full text

APA, Harvard, Vancouver, ISO, and other styles

35

Mesquita, Marcos Paulo, Elizeth Gonzaga dos Santos Lima, and Denise Balarine Cavalheiro Leite. "CONHECIMENTO PRODUZIDO SOBRE AUTOAVALIAÇÃO NOS PROGRAMAS DE PÓS-GRADUAÇÃO BRASILEIROS." Educere et Educare 18, no. 45 (April 12, 2023): 106–25. http://dx.doi.org/10.48075/educare.v18i45.30343.

Full text

Abstract:

Este trabalho mapeia as pesquisas nos Programas Nacionais de Pós-Graduação (PNPG) de 2015 a 2020 que discutem a autoavaliação (AA), indicador de qualidade introduzido pela CAPES e já adotado no quadriênio iniciado no ano de 2021. Seguimos os procedimentos da pesquisa qualitativa com o foco em análises bibliográfica e documental ao tentar identificar práticas inovadoras de autoavaliação nos programas de pós-graduação (PPGs) do Brasil presentes nas teses e dissertações catalogadas no BTDC-CAPES. Encontramos 465.115 trabalhos publicados, entre os quais 888 versavam sobre a autoavaliação. Identificamos uma predominância de pesquisas de AA voltadas a cursos de graduação e os maiores esforços de pesquisa do tema em relação a pós-graduação estão nas teses de doutorado. Constatamos que poucos programas teriam implantado e implementado a autoavaliação anteriormente às exigências da quadrienal CAPES 2021-2024. Isso indicaria uma possível deficiência, uma fraqueza, na cultura do uso informado da AA nos PPGs, o que poderia vir a se tornar uma barreira à sua implantação. Esses desafios devem ser enfrentados para que os avanços da inclusão da AA no atual instrumento de avaliação da CAPES não percam sua intencionalidade e sucumbam ao burocratismo favorecendo a manutenção da cultura de avaliação existente pela inação e conformismo. Ainda e sem concluir, apresentamos reflexões críticas sobre a AA, notadamente, no que tange à inestimável contribuição aos PNPGs.

APA, Harvard, Vancouver, ISO, and other styles

36

Sun, Wentao, Guixue Bian, Luanluan Jia, Junjun Pai, Zonghao Ye, Ning Wang, Jiantao Qi, and Tengjiao Li. "Study of Trivalent Chromium Conversion Coating Formation at Solution—Metal Interface." Metals 13, no. 1 (January 1, 2023): 93. http://dx.doi.org/10.3390/met13010093.

Full text

Abstract:

The present study employed a tungsten pH microelectrode to study the formation of trivalent chromium conversion (TCC) coatings on Al, AA 2024-T3 aluminum alloy and AZ91D magnesium alloy in SurTec ChromitAL solutions. The tungsten microelectrode had a sensitivity of –60 mV/pH in the SurTec ChromitAL solutions. The peak and final pH values for pre-treated Al, AA 2024 alloy and AZ91D alloy were 4.9 and 3.5, 4.3 and 4.1, 4.7 and 3.5, respectively. The initial pH value is of great importance in influencing coating deposition-driven force and final coating thickness. In addition, the time to attain the peak values was 10, 100 and 20 s for Al, AA 2024 alloy and AZ91D alloy, respectively. The interfacial pH evolution is associated with the hydrolysis process of the weak acid nature of zirconium and chromium salts as the main components of TCC coating solutions. Raman spectra revealed the presence of chromium and zirconium oxides and sulphate in the solution deposits from in-house Cr/Zr and SurTec ChromitAL solutions.

APA, Harvard, Vancouver, ISO, and other styles

37

Ashwath, P., J. Joel, M. Anthony Xavior, and H. G. Prashantha Kumar. "Effect of SiC and Al2O3 particles addition to AA 2900 and AA 2024 MMC’s synthesized through microwave sintering." Materials Today: Proceedings 5, no. 2 (2018): 7329–36. http://dx.doi.org/10.1016/j.matpr.2017.11.402.

Full text

APA, Harvard, Vancouver, ISO, and other styles

38

Villuendas, A., Antoni Roca, and Jordi Jorba. "Change of Young's Modulus of Cold-Deformed Aluminum AA 1050 and of AA 2024 (T65): A Comparative Study." Materials Science Forum 539-543 (March 2007): 293–98. http://dx.doi.org/10.4028/www.scientific.net/msf.539-543.293.

Full text

Abstract:

The knowledge of some mechanical properties of materials and their changes with thermal treatments and/or mechanical treatments are essential to obtain the best results during simulation of processes. In this paper, changes of Young's modulus at room temperature of colddeformed aluminum AA1050 carried out in a tension machine and changes of Young’s modulus and Poisson’s ratio of AA2024 (T6 and T65) have been determined. The elastics constants have been measured by the ultrasound technique in AA2024 alloy and by tensile test in AA1050. In this alloy, the Young's modulus (E) diminishes during the first step of deformation and then increases with the successive cold working. Changes in Young's modulus measured are around 6-8%. In AA2024, the Young's modulus change is about 3% between the annealed and quenched alloy (minimum value); during aging the E parameter increases with respect to quenching. These changes are correlated with the structural changes during thermal treatments. In AA2024, the E parameter remains almost constant during cold-working after the aging treatment. Poisson’s ratio of this alloy remains almost constant in all the treatments. These results are also correlated with the dislocations arrangement in both materials. This behaviour is also compared with cold-deformed pure iron in a tensile test. These results confirm that aluminum AA1050 present similar behaviour than it was observed for pure iron.

APA, Harvard, Vancouver, ISO, and other styles

39

Stille, Sebastian, Tilmann Beck, and Lorenz Singheiser. "Fatigue Behavior of Riblet Structured High Strength Aluminum Alloy Thin Sheets at Very High Cycle Numbers." Key Engineering Materials 664 (September 2015): 199–208. http://dx.doi.org/10.4028/www.scientific.net/kem.664.199.

Full text

Abstract:

The VHCF behavior of age hardened 2024 and 7075 aluminum sheets was studied. The experiments were performed at frequencies of ≈ 20 kHz with fully reversed axial loading (R = -1). Special focus was put on the influence of AA 1050 claddings and riblet-like surface structures, which are used in aerospace applications to reduce aerodynamic drag. The fatigue life and fatigue limit of the AA 2024 bare material are – compared to the non-structured case – significantly reduced by the stress concentrations induced by the riblet structure. However, the fatigue behavior of the clad AA 2024 material is less sensitive to the surface structure. In this case, we obtained a sharp transition from HCF failure up to 5x106 cycles to run-outs at ≥ 2x109 cycles. This threshold value for failure differs with cladding thickness as well as with riblet geometry. We attribute this to the modified stress distribution near the interface (cladding/substrate) as well as to a locally reduced thickness of the cladding in the riblet valleys. Fatigue cracks are – even in the case of run-outs – always initiated at the surface of the clad layer and grow easily to the substrate. Samples only fail, if the threshold for further crack growth into the substrate is exceeded. Both Alclad 2024 and 7075 show the same failure mechanism.

APA, Harvard, Vancouver, ISO, and other styles

40

Cammarota, Gian Paolo, Lorella Ceschini, Angelo Casagrande, Fabio Corvucci, Gian Luca Garagnani, Elio Lanzoni, and Franco Persiani. "Non Conventional Joints of 2024 and 7075 Aluminium Alloys Obtained by Diffusion Bonding / Das Diffusionsschweißen als unkonventionelles Verbindungsverfahren für Aluminiumlegierungen vom Typ AA 2024 und AA 7075." Practical Metallography 29, no. 4 (April 1, 1992): 192–203. http://dx.doi.org/10.1515/pm-1992-290403.

Full text

APA, Harvard, Vancouver, ISO, and other styles

41

Halkaci, Huseyin Selcuk, Mevlut Turkoz, and Osman Yiğit. "Effects of Heat Treatment Conditions on the Mechanical Properties of AA 2024 Alloy." Applied Mechanics and Materials 217-219 (November 2012): 1225–29. http://dx.doi.org/10.4028/www.scientific.net/amm.217-219.1225.

Full text

Abstract:

Aluminum alloys have good properties such as high strength-to-weight ratio, corrosion resistance and relatively low cost. Nowadays they are primarily used as wrought and cast in many industries such as automotive, aviation and aerospace because of these properties. Aluminum alloys are classified into two categories as non-heat-treatable and heat-treatable. The mechanical properties of the heat-treatable alloys are improved by solution heat treatment and controlled ageing. While mechanical properties of some heat-treatable alloys, especially 2XXX series, become stable with natural ageing at room temperature within a few days, some of them are unstable and exhibit significant changes in properties even after many years. Heat treatment process of AA 2024 is very sensible and critical and therefore should be carefully performed. In this research, effects of the solution temperature, soaking time, heating rate and quenching delay condition of AA 2024 on the mechanical properties were investigated.

APA, Harvard, Vancouver, ISO, and other styles

42

Vuherer, T., M. Milčić, S. Glodež, D. Milčić, L. Radović, and J. Kramberger. "Fatigue and fracture behaviour of Friction Stir Welded AA-2024-T351 joints." Theoretical and Applied Fracture Mechanics 114 (August 2021): 103027. http://dx.doi.org/10.1016/j.tafmec.2021.103027.

Full text

APA, Harvard, Vancouver, ISO, and other styles

43

Cao, Xin Jin, and Mohammad Jahazi. "Friction Stir Welding of Dissimilar AA 2024-T3 to AZ31B-H24 Alloys." Materials Science Forum 638-642 (January 2010): 3661–66. http://dx.doi.org/10.4028/www.scientific.net/msf.638-642.3661.

Full text

Abstract:

As a relatively new solid-state joining process, friction stir welding (FSW) may provide a feasible approach to join dissimilar materials such as Mg to Al alloys. In this work, the effects of selected process parameters including work-piece placement, pin tilting angle, and pin location on the quality of dissimilar AA 2024-T3 to AZ31B-H24 butt joints were investigated for the first time. Sound butt joints with low distortion and no solidification cavities or cracks were successfully obtained indicating the potential of FSW to join dissimilar Al to Mg alloys.

APA, Harvard, Vancouver, ISO, and other styles

44

Ilevbare, G. O., O. Schneider, R. G. Kelly, and J. R. Scully. "In Situ Confocal Laser Scanning Microscopy of AA 2024-T3 Corrosion Metrology." Journal of The Electrochemical Society 151, no. 8 (2004): B453. http://dx.doi.org/10.1149/1.1764780.

Full text

APA, Harvard, Vancouver, ISO, and other styles

45

Schneider, O., G. O. Ilevbare, J. R. Scully, and R. G. Kelly. "In Situ Confocal Laser Scanning Microscopy of AA 2024-T3 Corrosion Metrology." Journal of The Electrochemical Society 151, no. 8 (2004): B465. http://dx.doi.org/10.1149/1.1764781.

Full text

APA, Harvard, Vancouver, ISO, and other styles

46

Babu Rao, J., D. Venkata Rao, K. Siva Prasad, and N. R. M. R. Bhargava. "Dry sliding wear behaviour of fly ash particles reinforced AA 2024 composites." Materials Science-Poland 30, no. 3 (September 2012): 204–11. http://dx.doi.org/10.2478/s13536-012-0026-z.

Full text

APA, Harvard, Vancouver, ISO, and other styles

47

Kamaraj, K., Rajani Devarapalli, T. Siva, and S. Sathiyanarayanan. "Self-healing electrosynthesied polyaniline film as primer coat for AA 2024-T3." Materials Chemistry and Physics 153 (March 2015): 256–65. http://dx.doi.org/10.1016/j.matchemphys.2015.01.012.

Full text

APA, Harvard, Vancouver, ISO, and other styles

48

Anthony Xavior, M., H. G. Prashantha Kumar, and K. Ajith Kumar. "Tribological studies on AA 2024 –Graphene/CNT Nanocomposites processed through Powder Metallurgy." Materials Today: Proceedings 5, no. 2 (2018): 6588–96. http://dx.doi.org/10.1016/j.matpr.2017.11.314.

Full text

APA, Harvard, Vancouver, ISO, and other styles

49

Sameezadeh, Mahmood, Hassan Farhangi, and Massoud Emamy. "Structural characterization of AA 2024-MoSi2 nanocomposite powders produced by mechanical milling." International Journal of Minerals, Metallurgy, and Materials 20, no. 3 (March 2013): 298–306. http://dx.doi.org/10.1007/s12613-013-0727-2.

Full text

APA, Harvard, Vancouver, ISO, and other styles

50

Gonzalez, E., J. Pavez, I. Azocar, J. H. Zagal, X. Zhou, F. Melo, G. E. Thompson, and M. A. Páez. "A silanol-based nanocomposite coating for protection of AA-2024 aluminium alloy." Electrochimica Acta 56, no. 22 (September 2011): 7586–95. http://dx.doi.org/10.1016/j.electacta.2011.06.082.

Full text

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!