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Dissertations / Theses on the topic 'Precipitation hardening'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Zeng, Ruilin. "Precipitation hardening in AZ91 magnesium alloy." Thesis, University of Birmingham, 2013. http://etheses.bham.ac.uk//id/eprint/4695/.

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The microstructure evolution of a sand cast AZ91 magnesium alloy during heat treatment (solution treatment and subsequent ageing) were characterized quantitatively using a combination of optical microscopy (OM), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The area fraction of discontinuous precipitates and number density of continuous precipitates (N\(_V\)) in the AZ91 alloys with and without pre-deformation were measured using OM and TEM, respectively. Based on these metallurgical evidences, the existing precipitation strengthening mode for AZ91 was modified

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2

Zangiabadi, Amirali. "Low-temperature interstitial hardening of 15-5 precipitation hardening martensitic stainless steel." Case Western Reserve University School of Graduate Studies / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=case1480769348244855.

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3

Adegoke, Olutayo. "Homogenization of Precipitation Hardening Nickel Based Superalloys." Thesis, Högskolan Dalarna, Materialvetenskap, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:du-11135.

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Allvac 718 Plus and Haynes 282 are relatively new precipitation hardening nickel based superalloys with good high temperature mechanical properties. In addition, the weldability of these superalloys enhances easy fabrication. The combination of high temperature capabilities and superior weldability is unmatched by other precipitation hardening superalloys and linked to the amount of the γ’ hardening precipitates in the materials. Hence, it is these properties that make Allvac 718 Plus and Haynes 282 desirable in the manufacture of hot sections of aero engine components. Studies show that cast

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4

Kubota, Masahiro 1967. "The precipitation hardening response in A1-Mg(-Ag) alloys." Monash University, Dept. of Materials Engineering, 2001. http://arrow.monash.edu.au/hdl/1959.1/9204.

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5

Ross, T. "Structure and precipitate morphology relationships in a 68Cr-32Ni binary system." Thesis, This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-04212010-143716/.

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6

Nicol, Alison. "Aspects of copper precipitation and irradiation hardening in Fe-Cu alloys." Thesis, University of Oxford, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.325841.

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7

Gan, Wei. "Precipitation and strengthening in AL-GE-SI alloys." The Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=osu1135275701.

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8

Huang, Kai. "Precipitation Strengthening in Al-Ni-Mn Alloys." Digital WPI, 2015. https://digitalcommons.wpi.edu/etd-theses/384.

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Precipitation hardening of eutectic and hypoeutectic Al-Ni alloys by 2-4 wt pct. manganese is investigated with focus on the effect of the alloysâ€™ chemical composition and solidification cooling rate on microstructure and tensile strength. Within the context of the investigation, mathematical equations based on the Orowan Looping strengthening mechanism were used to calculate the strengthening increment contributed by each of the phases present in the aged alloy. The calculations agree well with measured values and suggest that the larger part of the alloyâ€™s yield strength is due to the Al

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9

Gwalani, Bharat. "Developing Precipitation Hardenable High Entropy Alloys." Thesis, University of North Texas, 2017. https://digital.library.unt.edu/ark:/67531/metadc1011755/.

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High entropy alloys (HEAs) is a concept wherein alloys are constructed with five or more elements mixed in equal proportions; these are also known as multi-principle elements (MPEs) or complex concentrated alloys (CCAs). This PhD thesis dissertation presents research conducted to develop precipitation-hardenable high entropy alloys using a much-studied fcc-based equi-atomic quaternary alloy (CoCrFeNi). Minor additions of aluminium make the alloy amenable for precipitating ordered intermetallic phases in an fcc matrix. Aluminum also affects grain growth kinetics and Hall-Petch hardenability.

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10

Lyon, Mark Edward. "Incorporating Functionally Graded Materials and Precipitation Hardening into Microstructure Sensitive Design." Diss., CLICK HERE for online access, 2003. http://contentdm.lib.byu.edu/ETD/image/etd260.pdf.

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11

Fan, Yangyang. "Precipitation Strengthening of Aluminum by Transition Metal Aluminides." Digital WPI, 2012. https://digitalcommons.wpi.edu/etd-theses/231.

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Aluminum-zirconium alloys exhibit superior strength at elevated temperature in comparison to traditional aluminum casting alloys. These alloys are heat-treatable and their strength depends to a large extent on the quenching and aging steps of the heat treatment process. However, measurements show that the critical cooling rate necessary to retain 0.6 wt. pct. zirconium(the minimum amount necessary for significant strengthening) in a super-saturated solid solution with aluminum is 90ºC/s, which is un-attainable with traditional casting processes. On the other hand, the critical cooling rate nec

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12

Liu, Weijie. "Precipitation of Ti(CN) in austenite : experimental results, analysis and modelling." Thesis, McGill University, 1987. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=75434.

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Stress relaxation measurements were carried out on a plain carbon and four Ti steels over the temperature range 850 to 1050$ sp circ$C. The results show that the stress relaxation of plain carbon austenite after a 5% prestrain can be described by the relation $ sigma$ = $ sigma sb0$-$ alpha$ln(1 + $ beta$t). By contrast, in the solution-treated Ti steels, relaxation is arrested at the start of precipitation and is resumed when precipitation is complete. As a result, this new mechanical method is suitable for following carbonitride precipitation in microalloyed austenite at hot working temperat

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13

Jeniski, Richard A. Jr. "Recrystallization behavior of aluminum alloy 6013." Thesis, Georgia Institute of Technology, 1993. http://hdl.handle.net/1853/19412.

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14

Shahbazian, Yassar Reza. "Characterization and modeling of dislocation-precipitation interactions in aluminum al[l]oys." Online access for everyone, 2005. http://www.dissertations.wsu.edu/Dissertations/Fall2005/r%5Fshahbazian%5Fyassar%5F102305.pdf.

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15

Hwang, Junyeon Kaufman M. J. "Characterization and mechanical properties of nanoscale precipitates in modified Al-Si-Cu alloys using transmission electron microscopy and 3D atom probe tomography." [Denton, Tex.] : University of North Texas, 2007. http://digital.library.unt.edu/permalink/meta-dc-3661.

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16

Negm, N. Z. "Soft X-ray investigations of Pt-Au alloys and precipitation hardening Al based alloys." Thesis, University of Strathclyde, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.381737.

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17

Fan, Yangyang. "Precipitation Strengthening of Aluminum by Transition Metal Aluminides." Digital WPI, 2015. https://digitalcommons.wpi.edu/etd-dissertations/209.

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A castable alloy, i.e., one that flows easily to fill the entire mold cavity and also has resistance to hot tearing during solidification, must invariably contain a sufficient amount of a eutectic structure. For this reason, most traditional aluminum casting alloys contain silicon because the aluminum-silicon eutectic imparts to the alloy excellent casting characteristics. However, the solidus temperature in the Al-Si system does not exceed 577Â°C, and the major alloying elements (i.e., zinc, magnesium, and copper) used with silicon in these alloys further lower the solidus temperature. Also,

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18

Martinsen, Fredrik Aleksander. "Clustering during Natural Aging and its Effect on Precipitation Hardening in Al-Mg-Si Alloys." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for fysikk, 2011. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-13636.

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The effect of clustering during natural aging of three different Al-Mg-Sialloys with equal Mg/Si-ratios, but different Mg+Si contents have beenstudied through hardness measurements and transmission electron mi-croscopy (TEM). Hardness measurements were performed both duringnatural aging (NA) and after various NA times followed by subsequentartificial aging for all alloys, while TEM-investigations were performedon selected samples. The results from the experiments were comparedand the existence of three different clustering processes were discovered.The first process was established to be Si-Si

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19

Leitch, John Edward. "The role of interstitial nitrogen in the precipitation hardening reactions in high-chromium ferritic steels." Master's thesis, University of Cape Town, 1987. http://hdl.handle.net/11427/22176.

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Bibliography: pages 107-108.<br>The effects of exposure to temperatures in the range 475 - 800°C on the hardness and associated microstructure of high chromium ferritic steels has been investigated. Low-carbon 26Cr-1Mo steels containing 0,02 - 0,04% nitrogen were found to constitute an age hardening system when quenched from a temperature of nitrogen solubility and exposed at temperatures in the range 600 - 700°C. TEM observations on thin foils revealed that hardening was associated with the formation of a high density of Cr-N zones. These grew on over-ageing into disc-shaped Cr-N precipitates

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20

Rodgers, Benjamin. "The application of taper-rolling to the near-net-shape production of aluminium wing skins." Thesis, University of Manchester, 2017. https://www.research.manchester.ac.uk/portal/en/theses/the-application-of-taperrolling-to-the-nearnetshape-production-of-aluminium-wing-skins(8f830ecc-3857-423a-8c44-4f8d78d65b6f).html.

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Initial investigations were conducted to determine the feasibility of applying a post solution heat treatment stress relief stretching operation to near-net-shaped taper rolled aerospace aluminium plate, in terms of the possible process window and the impact on key mechanical properties. Finite element modelling (FEM) and simulations, validated using digital image correlation to measure the strain distribution in flat tapered tensile specimens, have demonstrated the existence of a suitable process window for the production of near-net-shape wing skin blanks. It was revealed that the limits of

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21

Mattes, Victor R. "Microstructure and mechanical properties of HSLA-100 steel." Thesis, Monterey, California : Naval Postgraduate School, 1990. http://handle.dtic.mil/100.2/ADA242937.

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Thesis (M.S. in Mechanical Engineering and Mechanical Engineer)--Naval Postgraduate School, December 1990.<br>Thesis Advisor(s): Fox, Alan G. "December 1990." Description based on title screen as viewed on April 2. 2010. DTIC Identifier(s): Steel, Microstructure, Mechanical Properties, Copper, Quenching, Tempering, Processing, Naval Vessels, HSLA-100 Steel, Theses, Age Hardening, Modulus of Elasticity, Charpy V Notch Tests. Author(s) subject terms: HSLA-100, Mechanical Properties, Copper Precipitation, Carbide. Includes bibliographical references (p. 66-68). Also available in print.

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22

PRASAD, PRASHANTH. "CHARACTERIZATION OF NEW, CAST, HIGH TEMPERATURE ALUMINUM ALLOYS FOR DIESEL ENGINE APPLICATIONS." University of Cincinnati / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1148315194.

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23

Reimann, Martin [Verfasser], and Norbert [Akademischer Betreuer] Huber. "Keyhole repair in precipitation hardening aluminum alloys using refill friction stir spot welding / Martin Reimann ; Betreuer: Norbert Huber." Hamburg : Universitätsbibliothek der Technischen Universität Hamburg-Harburg, 2018. http://d-nb.info/1172812853/34.

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24

Rey, Tomas. "Investigation of Microstructure and Mechanical Properties in Hot-work Tool Steels." Thesis, KTH, Materialvetenskap, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-210699.

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Hot-work tool steels make up an important group of steels that are able to perform with good strength and toughness properties at elevated temperatures and stresses. They are able to gain this behavior through their alloy composition and heat treatment, which relies on the precipitation of alloy carbides to counter the loss in strength as the tempered material becomes more ductile. As demand grows for materials that are suitable for even harsher applications and that show improved mechanical qualities, the steel industry must continuously investigate the development of new steel grades. Within

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25

Zander, Johan. "Modelling mechanical properties by analysing datasets of commercial alloys." Licentiate thesis, Stockholm : Industriell teknik och management, Kungliga Tekniska högskolan, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-4527.

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26

Winkelman, Graham B. "Precipitation at dislocations in Al-Cu-Mg alloys." Monash University, School of Physics and Materials Engineering, 2003. http://arrow.monash.edu.au/hdl/1959.1/9581.

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27

Hwang, Junyeon. "Characterization and Mechanical Properties of Nanoscale Precipitates in Modified Al-Si-Cu Alloys Using Transmission Electron Microscopy and 3D Atom Probe Tomography." Thesis, University of North Texas, 2007. https://digital.library.unt.edu/ark:/67531/metadc3661/.

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Among the commercial aluminum alloys, aluminum 319 (Al-7wt%Si-4wt%Cu) type alloys are popularly used in automobile engine parts. These alloys have good casting characteristics and excellent mechanical properties resulting from a suitable heat treatment. To get a high strength in the 319 type alloys, grain refining, reducing the porosity, solid solution hardening, and precipitation hardening are preferred. All experimental variables such as solidification condition, composition, and heat treatment are influence on the precipitation behavior; however, precipitation hardening is the most signific

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28

Letovanec, Juraj. "Vliv teplotního režimu vytvrzování slitin typu Al-Si na mechanické vlastnosti." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-387729.

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The aim of this thesis is influence of precipitation hardening regime, specifically quench rate, on mechanical properties of aluminium alloy A356 (AlSi7Mg0.3). Samples were after solution treatment quenched into water with different temperatures and age hardened. Tensile strength tests, hardness tests and microstructure observations were done after heat tretment.

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29

PADIAL, ARMANDO G. F. "Caracterizacao microestrutural do aco maraging de grau 400 de resistencia mecanica ultra-elevada." reponame:Repositório Institucional do IPEN, 2002. http://repositorio.ipen.br:8080/xmlui/handle/123456789/10998.

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Made available in DSpace on 2014-10-09T12:46:42Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T13:56:09Z (GMT). No. of bitstreams: 1 07613.pdf: 5555459 bytes, checksum: 0047c9f052248797761d648268e841ba (MD5)<br>Tese (Doutoramento)<br>IPEN/T<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP

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30

Tanprayoon, Dhritti [Verfasser]. "Investigation of the precipitation hardening behaviour and the corrosion properties of novel aluminium : manganese alloys containing scandium and zirconium / Dhritti Tanprayoon." Clausthal-Zellerfeld : Universitätsbibliothek Clausthal, 2015. http://d-nb.info/1079106235/34.

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31

Apps, Peter Joseph. "The effects of the rare earth elements yttrium, gadolinium and dysprosium on the microstructure and properties of precipitation hardening magnesium alloys." Thesis, University of Manchester, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.488095.

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32

Meher, Subhashish. "Comparative Coarsening Kinetics of Gamma Prime Precipitates in Nickel and Cobalt Base Superalloys." Thesis, University of North Texas, 2014. https://digital.library.unt.edu/ark:/67531/metadc699871/.

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The increasing technological need to push service conditions of structural materials to higher temperatures has motivated the development of several alloy systems. Among them, superalloys are an excellent candidate for high temperature applications because of their ability to form coherent ordered precipitates, which enable the retention of high strength close to their melting temperature. The accelerated kinetics of solute diffusion, with or without an added component of mechanical stress, leads to coarsening of the precipitates, and results in microstructural degradation, limiting the durab

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33

Tang, Fei. "The Microstructure-Processing-Property Relationships in an Al Matrix Composite System Reinforced by Al-Cu-Fe Alloy Particles." Washington, D.C. : Oak Ridge, Tenn. : United States. Dept. of Energy. Office of Science ; distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2004. http://www.osti.gov/servlets/purl/835313-syGDu9/webviewable/.

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34

Zahiri, Saden H. (Saden Heshmatollah) 1966. "Prediction of the processing window and austemperability for austempered ductile iron." Monash University, School of Physics and Materials Engineering, 2002. http://arrow.monash.edu.au/hdl/1959.1/8408.

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35

Fan, Yangyang. "Alloying Aluminum with Transition Metals." Digital WPI, 2015. https://digitalcommons.wpi.edu/etd-dissertations/266.

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A castable alloy, i.e., one that flows easily to fill the entire mold cavity and also has resistance to hot tearing during solidification, must invariably contain a sufficient amount of a eutectic structure. For this reason, most traditional aluminum casting alloys contain silicon because the aluminum-silicon eutectic imparts to the alloy excellent casting characteristics. However, the solidus temperature in the Al-Si system does not exceed 577Â°C, and the major alloying elements (i.e., zinc, magnesium, and copper) used with silicon in these alloys further lower the solidus temperature. Also,

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36

Grosset, Lisa. "Développement et validation d’un modèle de vieillissement thermique d’alliages d’aluminium pour application aéronautique." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSEM010.

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Les exigences des clients du secteur aéronautique imposent aux entreprises de prendre en compte pour le dimensionnement les effets de la température sur toute la durée de vie du produit. Cependant, aucune loi ne permet actuellement de prévoir l’impact du vieillissement thermique sur le comportement des matériaux. Ce travail a pour objectif de comprendre le mécanisme de vieillissement thermique des alliages d’aluminium et son impact sur les propriétés mécaniques, mais surtout d’acquérir un outil performant capable d’obtenir rapidement des données matériaux après vieillissement.Au cours de cette

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37

Lindwall, Greta. "Multicomponent diffusional reactions in tool steels : Experiment and Theory." Doctoral thesis, KTH, Termodynamisk modellering, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-103328.

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Many phenomena determining the microstructure of a tool steel and consequently the properties of the material, are governed by multicomponent diffusion. The diffusion driven reactions that take place during, for example, tempering of a hot-work tool steel or when the microstructure develops during hot isostatic pressing of cold-work tool steel, are dependent on the types and amounts of alloying elements. In order for computational methods to be usable, these alloying effects need to be understood and incorporated in the models. In this work the influence of some typical tool steel alloying ele

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38

Lv, Duchao. "A Multi-Scale Simulation Approach to Deformation Mechanism Prediction in Superalloys." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1469009668.

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39

Tintillier, Rémy. "Résistance à la propagation aux faibles vitesses des fissures de fatigue dans un alliage aluminium-lithium type 8090." Poitiers, 1988. http://www.theses.fr/1988POIT2295.

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Caracterisation du comportement en fissuration par fatigue au voisinage du seuil de non-propagation dans l'alliage al-2,5li-1,4cu-0,7 mg dans trois conditions de revenu, soumis a des essais de seuil sous vide et a l'air pour des rapports de charge variant de 0,01 a 0,8. Comparaison avec des alliages d'aluminium conventionnels. Determination a partir de cette comparaison du mecanisme de glissement planaire induit par la precipitation durcissante delta ' dans l'alliage 8090. Analyse des differences de comportement en tenant compte des effets de fermeture et des interactions microstructure-enviro

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40

Deschamps, Alexis. "Influence de la prédéformation et des traitements thermiques sur la microstructure et les propriétés mécaniques des alliages Al-Zn-Mg-Cu." Grenoble INPG, 1997. http://www.theses.fr/1997INPG0067.

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Nous avons etudie l'influence du traitement thermomecanique des alliages al-zn-mg-cu sur leur microstructure et leurs proprietes mecaniques. Plus specifiquement, nous avons etudie comment les mecanismes de precipitation et de durcissement structural sont modifies lorsqu'on introduit des dislocations par detensionnement prealablement au traitement de revenu. La premiere approche de ce probleme est experimentale : le but etait d'obtenir des relations entre les microstructures developpees suivant les differents traitements thermomecaniques et les proprietes mecaniques qui en resultent. Pour cela

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41

Ibrahim, Alaaeldin Mahmoud Hussien [Verfasser], Reinhard Gutachter] Krause-Rehberg, Hartmut S. [Gutachter] [Leipner, and John [Gutachter] Banhart. "The role of trace elements on formation of quenched-in vacancies and precipitation hardening in Al-alloys / Alaaeldin Mahmoud Hussien Ibrahim ; Gutachter: Reinhard Krause-Rehberg, Hartmut S. Leipner, John Banhart." Halle (Saale) : Universitäts- und Landesbibliothek Sachsen-Anhalt, 2019. http://nbn-resolving.de/urn:nbn:de:gbv:3:4-1981185920-324604.

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42

Ibrahim, Alaaeldin Mahmoud Hussien [Verfasser], Reinhard Gutachter] Krause-Rehberg, Hartmut S. [Gutachter] Leipner, and John [Gutachter] [Banhart. "The role of trace elements on formation of quenched-in vacancies and precipitation hardening in Al-alloys / Alaaeldin Mahmoud Hussien Ibrahim ; Gutachter: Reinhard Krause-Rehberg, Hartmut S. Leipner, John Banhart." Halle (Saale) : Universitäts- und Landesbibliothek Sachsen-Anhalt, 2019. http://d-nb.info/121072734X/34.

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43

Ibrahim, Alaaeldin Mahmoud Hussien [Verfasser], Reinhard [Gutachter] Krause-Rehberg, Hartmut S. [Gutachter] Leipner, and John [Gutachter] Banhart. "The role of trace elements on formation of quenched-in vacancies and precipitation hardening in Al-alloys / Alaaeldin Mahmoud Hussien Ibrahim ; Gutachter: Reinhard Krause-Rehberg, Hartmut S. Leipner, John Banhart." Halle (Saale) : Universitäts- und Landesbibliothek Sachsen-Anhalt, 2019. http://d-nb.info/121072734X/34.

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44

Kovarik, Libor. "Microstructural study and modeling of metastable phases and their effect on strenghthening [sic] in Al-Mg-Cu-Si alloying system." The Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=osu1149006665.

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45

Phung-on, Isaratat. "An investigation of reheat cracking in the weld heat affected zone of type 347 stainless steel." Columbus, Ohio : Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1188419315.

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46

Beraldo, Camila Haga. "Efeito da temperatura de envelhecimento sobre as propriedades mecânicas e resistência à corrosão por pite do aço inoxidável martensítico endurecido por precipitação UNS S46500." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/3/3133/tde-15102014-163925/.

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Os aços inoxidáveis endurecidos por precipitação vêm sendo largamente empregados na indústria aeronáutica, por combinar resistência mecânica, tenacidade à fratura e resistência à corrosão. E deste modo, são materiais que possibilitam a substituição dos aços carbonos utilizados atualmente, que necessitam de tratamento superficial adicional, como o cádmio, para melhorar a resistência à corrosão. A utilização desses revestimentos traz desvantagens como o custo, a fabricação, a susceptibilidade à fragilização por hidrogênio além dos aspectos ambientais. Neste contexto, o aço endurecido por precipi

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47

Perrier, Malika. "Etude de la relation entre la microstructure et les propriétés mécaniques d'un acier durci par précipitation intermétallique intense : le Fer-Silicium-Titane." Phd thesis, Université de Grenoble, 2011. http://tel.archives-ouvertes.fr/tel-00721729.

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L'amélioration des propriétés mécaniques dans les alliages du système Fer-Silicium-Titane grâce à l'introduction d'une précipitation nanométrique a été démontrée dans la littérature. La haute valeur de limite d'élasticité qui peut être atteinte dans ces aciers en fait de bons candidats pour des applications dans l'élaboration de structures automobiles. Dans ce contexte, cette étude a pour objectif de caractériser et comprendre la séquence et la cinétique de précipitation dans ces alliages, ainsi que les relations entre microstructure de précipitation et propriétés mécaniques, dans une démarche

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48

Balan, Alexandre. "Modélisation isotherme et anisotherme de la limite d'élasticité précipitation-dépendante de l'Inconel 718." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSEI003/document.

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Ce manuscrit de thèse présente les résultats de travaux concernant les effets des transitoires thermiques sur la précipitation des phases intermétalliques dans le superalliage base nickel Inconel 718® et les conséquences de cette précipitation sur les propriétés mécaniques de cet alliage. Ces travaux se concentrent sur une approche couplée capable de décrire l’évolution de la précipitation de la phase γ'' et ses conséquences sur la limite d’élasticité de l’Inconel 718®. L’état de précipitation est modélisé grâce à l’implémentation des équations de la théorie classique de germination et de croi

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Ševčíková, Barbora. "Koroze neželezných kovových materiálů." Doctoral thesis, Vysoké učení technické v Brně. Fakulta chemická, 2018. http://www.nusl.cz/ntk/nusl-390295.

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In the presented dissertation thesis, I closely focused on corrosion resistance of non-ferrous metals. For full understanding of the possibilities for increasing corrosion resistance, it was vital to initially recognize the influences to the corrosion system of the samples and their surrounding environment. For this purpose, I focused on heat treatment, corrosion, and protective coatings, in the theoretical part of the thesis. For the subsequent research, it was necessary to define several constant variables, first. For this purpose, I have chosen a group of magnesium alloys, namely AZ91 Alloy

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Jubica, Jubica. "Characterization of Secondary Carbides in Low-Alloyed Martensitic Model Alloy Tool Steels." Thesis, KTH, Materialvetenskap, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-284449.

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The development of tool steels for making and shaping other materials requires a better understanding of the material's properties during manufacture. These high-quality steels include many alloying elements, which give increased hardness during tempering. For producing hardened microstructures, austenite generation is essential. The martensite formed by rapid quenching of austenite followed by tempering helps develop high strength steels. Studying carbide precipitation is a challenge as they are very small in size, present only in small volume fractions and high number densities. The carbide

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