期刊
出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2016.05.016
关键词
Aluminium alloy; Co-clusters; Modulus hardening; Atom probe tomography
类别
资金
- National Natural Science Foundation of China [51171209]
- National Basic Research Program of China [2012CB619506]
The modulus hardening capability of various co-clusters in a low Cu/Mg ratio Al-Cu-Mg-Ag alloy aged at 165 degrees C is investigated by quantitative atom probe tomography analysis. Prolonged aging from 5 min to 2 h leads to the simultaneous increase in the critical shear stress of both Mg-Ag and Cu-Mg co-clusters. Regardless of the higher shear modulus of Cu-Mg co-clusters, calculation results show that Mg-Ag co clusters possess a greater modulus hardening capability than Cu-Mg co-clusters, suggesting its primary contribution to the rapid hardening at the early aging stage. As aging extends from 30 min to 2 h, the increment in the critical shear stress of Mg-Ag co-clusters is lower than that of Cu-Mg co-clusters due to the precipitation of high density SI phase. In addition, the shear modulus of Mg-Ag co-clusters is generally independent on its size at each investigated condition. (C) 2016 Elsevier B.V. All rights reserved.
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