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Effects of pre-treatments on precipitate microstructures and creep-rupture behavior of an Al–Zn–Mg–Cu alloy

Published online by Cambridge University Press:  15 April 2016

Y.C. Lin ,
Zong-Wei Wang ,
Dao-Guang He ,
Ying Zhou ,
Ming-Song Chen ,
Ming-Hui Huang  and
Jin-Long Zhang
Y.C. Lin*
Affiliation:
School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China; Light Alloy Research Institute of Central South University, Changsha 410083, China; and State Key Laboratory of High Performance Complex Manufacturing, Changsha 410083, China
Zong-Wei Wang
Affiliation:
Light Alloy Research Institute of Central South University, Changsha 410083, China
Dao-Guang He
Affiliation:
Light Alloy Research Institute of Central South University, Changsha 410083, China
Ying Zhou
Affiliation:
School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China
Ming-Song Chen
Affiliation:
School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China; and State Key Laboratory of High Performance Complex Manufacturing, Changsha 410083, China
Ming-Hui Huang
Affiliation:
School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China; Light Alloy Research Institute of Central South University, Changsha 410083, China; and State Key Laboratory of High Performance Complex Manufacturing, Changsha 410083, China
Jin-Long Zhang
Affiliation:
School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China; and State Key Laboratory of High Performance Complex Manufacturing, Changsha 410083, China
*
a) Address all correspondence to this author. e-mail: yclin@csu.edu.cn, linyongcheng@163.com
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Abstract

The effects of pre-treatments on the precipitate microstructures of an Al–Zn–Mg–Cu alloy are investigated. Meanwhile, the creep-rupture behavior of the under-aged and peak-aged alloys are comparatively analyzed. Additionally, the effects of pre-treatment on the fracture mechanisms are discussed. It is found that the precipitate microstructures are sensitive to pre-treatments. The intragranular precipitates of the peak-aged alloy are larger than those of the under-aged. The precipitate free zone of the peak-aged alloy is wider than that of the under-aged. Some large intergranular precipitates appear on the grain boundaries of the under-aged alloy, and induce the nucleation of microvoids. Eventually, the creep fracture of the under-aged alloy is accelerated. Therefore, the differences in microstructures lead to the shorter creep-rupture life of the under-aged alloy, compared to the peak-aged alloy.

Keywords

microstructurescanning transmission electron microscopy (STEM)precipitatealloy
Type
Articles
Information
Journal of Materials Research , Volume 31 , Issue 9 , 14 May 2016 , pp. 1286 - 1295
Copyright
Copyright © Materials Research Society 2016 

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References

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