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Mechanical properties of β″ precipitates containing Al and/or Cu in age hardening Al alloys

Published online by Cambridge University Press:  03 March 2016

Yue Qiu ,
Yi Kong ,
ShiDi Xiao  and
Yong Du
Yue Qiu
Affiliation:
State Key Lab of Powder Metallurgy, Central South University, Changsha 410083, Hunan,China
Yi Kong*
Affiliation:
State Key Lab of Powder Metallurgy, Central South University, Changsha 410083, Hunan,China
ShiDi Xiao
Affiliation:
State Key Lab of Powder Metallurgy, Central South University, Changsha 410083, Hunan,China
Yong Du*
Affiliation:
State Key Lab of Powder Metallurgy, Central South University, Changsha 410083, Hunan,China
*
a)Address all correspondence to this author. e-mail: yikong@csu.edu.cn
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Abstract

Evidences show that the composition of β″ formed in age hardening of Al alloys should be the prototype Mg5Si6 with Al and/or Cu addition. In the present work, molecular dynamics simulations are carried out to investigate the influence of the addition of Al and/or Cu to the mechanical properties of the prototype Mg5Si6. Our simulations imply that Mg5Si6 with both Al and Cu addition has relatively poor mechanical performance when compared with other three models. The snapshots of atomic configurations during uniaxial tension test illustrate that only if both Al and Cu dissolve in β″, clusters can form through Al atoms segregating around Cu atoms, thus applying different stress fields on the Al matrix, resulting different mechanical properties in comparison with other three β″ models.

Keywords

freeze dryingWfoam
Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 5 , 14 March 2016 , pp. 580 - 588
Copyright
Copyright © Materials Research Society 2016 

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