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HomeDefect and Diffusion ForumDefect and Diffusion Forum Vol. 263Metastable Phase Formation in Multi-Component...

Metastable Phase Formation in Multi-Component Aluminium Alloys

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Abstract:

Many Aluminium alloys use the precipitation of metastable phases to generate optimum properties. The effect of including additional structures such as θ’ and GP zones is described in the context of a hierarchy of metastable structures. Extending a Thermodynamic data base that has been designed solely to deal with equilibrium conditions is a vital prerequisite to handling the heattreatment of aluminium alloys. It is then possible to generate TTT and CCT diagrams, using the Johnson-Mehl-Avrami treatment previously applied in to other materials providing provision is made for the presence of supersaturated quenched-in vacancies. Calculations using JMatPro are given for the expected behavior of commercial aluminium alloys of increasing complexity, including AA319, AA6061 and AA7075.

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Diffusion and Thermodynamics of Materials

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Periodical:

Defect and Diffusion Forum (Volume 263)

Pages:

31-40

DOI:

https://doi.org/10.4028/www.scientific.net/DDF.263.31

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Online since:

March 2007

Authors:

Alfred Peter Miodownik, N. Saunders, J.P. Schille, Zhan Li Guo

Keywords:

Aluminium Alloy, Calculation, CCT-Diagram, JMatPro, Metastable Phases, Multicomponent, TTT

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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