Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1574464 | Materials Science and Engineering: A | 2015 | 6 Pages |
Abstract
The individual contribution of different Cu-Mg co-clusters by modulus hardening to age-hardening response of an Al-Cu-Mg alloy at 170 °C is evaluated based on Vickers hardness measurements and quantitative atom probe tomography analysis. The present results show that it is order hardening of large Cu-Mg co-clusters or GPB zones rather than modulus hardening significantly contributes to the second stage of hardening. Despite prolonged aging from 5 min to 8 h leads to a noticeable change in the number density and the volume fraction of different Cu-Mg co-clusters, interestingly, the total critical shear stress of Cu-Mg co-clusters by modulus hardening fluctuates slightly, indicating the modulus hardening effect almost keeps unchanged at the hardness plateau. Besides, the shear modulus of Cu-Mg co-clusters is found to remain constant as aging prolongs at 170 °C.
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Physical Sciences and Engineering
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Authors
Meng Liu, Song Bai, Zhiyi Liu, Xuanwei Zhou, Peng Xia, Sumin Zeng,