Effects of Cu addition on as-cast microstructure and precipitation hardening of Mg-Bi alloy

被引：0
|
作者：
Zhou J.-J. [1 ]
Yang W.-P. [1 ,2 ]
Chen L. [1 ]
Cui H.-B. [1 ,2 ]
Guo X.-F. [1 ,2 ]
机构：
[1] School of Materials Science and Engineering, Henan Polytechnic University, Jiaozuo
[2] Henan International Joint Research Laboratory for High-Performance Light Metallic Materials and Numerical Simulations, Henan Polytechnic University, Jiaozuo
来源：
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | 2023年 / 33卷 / 03期
基金：
中国国家自然科学基金;
关键词：
age hardening; alloying; Mg-Bi alloy; microstructure;
D O I：
10.11817/j.ysxb.1004.0609.2021-42725
中图分类号：
学科分类号：
摘要：
The Mg-5Bi-xCu (x=0, 0.2, 0.5, 1.0, mass fraction, %) alloy ingots were prepared by conventional casting. The microstructures of as-cast alloys and precipitate hardening behavior were investigated. The results show that the as-cast Mg-Bi-Cu alloy is mainly composed of α -Mg, Mg3Bi2, MgCu2 and Mg2Cu phases. The orientation relationships between α -Mg matrix and Mg3Bi2 phase are (2-110)Mg3Bi2∥(01-11)Mg and [011-2]Mg3Bi2∥ [011-2]Mg. The orientation relationships between Mg2Cu phase and Mg3Bi2 phase are (111-)Mg2Cu∥(011-0)Mg3Bi2 and [1-10]Mg2Cu∥[0001]Mg3Bi2. The hardness of the alloy increases firstly and then decreases with the increase of Cu addition amount, and the highest hardness of (50.9±1.2)HV is achieved in the alloy with 0.5% Cu. The hardness of Mg-5Bi-0.5Cu alloy after solid-solution treatment is (49.8±0.9)HV. After aging at 175 ℃ for 64 h, the peak hardness of the alloy is (56.1±0.7)HV. The increase of aging hardness is attributed to the precipitation strengthening effect of high density Mg3Bi2. Moreover, due to the addition of Cu element, the long rod-shaped Mg3Bi2 precipitates transform to the granular and short rod-shaped precipitates. © 2023 Central South University of Technology. All rights reserved.
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页码：689 / 701
页数：12
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