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University of Southampton Research Repository

Zhihua ZHU

2006Englishphysical metallurgyphase transformationsmicrostructurealloysaluminium alloysageing

Abstract

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Application prospects in the automotive industry have led to increasing interests in the studies on Al-Mg-Cu-Si alloys. In this PhD thesis, nine Al-(1-3)Mg-(0-0.4)Cu-0.15Si-0.25Mn (in wt%) alloys with potential applications in both packaging and automotive industries have been investigated. The principal aim of the thesis is to elucidate the relation between processing and the final strength of the alloys. By means of mechanical testing, differential scanning calorimetry (DSC) and transmission electron microscopy (TEM), this study identified several mechanisms that influence the final strength of cold rolled alloys during ageing: solid solution, work hardening, recovery and precipitation. Microstructure analyses using field emission gun scanning electron microscopy (FEG-SEM) and energy dispersive spectroscopy (EDS) revealed the formation of undissolved coarse particles consuming the small Si addition, which influences age hardening behaviour. Furthermore, the thesis explores the development of a yield strength model accounting for ageing behaviour of solution treated samples, ultimately providing insights into enhancing the strength characteristics of these alloys for industrial applications.

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  title={University of Southampton Research Repository},
  author={Zhihua ZHU},
  year={2006},
  language={English}
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TI  - University of Southampton Research Repository
AU  - Zhihua ZHU
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