Precipitate evolution in Mg-6 wt%Zn-1 wt%Mn alloy

被引：0

作者：

Shi, Guoliang ^{[1
]}

Zhang, Dingfei ^{[2
]}

Zhao, Xiabing ^{[2
]}

Zhang, Kui ^{[1
]}

Li, Xinggang ^{[1
]}

Li, Yongjun ^{[1
]}

Ma, Minglong ^{[1
]}

机构：

[1] State Key Laboratory for Non-Ferrous Metals and Processes, General Research Institute for Non-Ferrous Metals, Beijing 100088, China

[2] Chongqing University, Chongqing, 400045, China

来源：

Xiyou Jinshu Cailiao Yu Gongcheng/Rare Metal Materials and Engineering | 2013年 / 42卷 / 12期

关键词：

Age hardening - Strain energy - Precipitation (chemical) - Manganese alloys - Nucleation - Zinc alloys;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

The evolution rules of transitional phases β1' and β2' during single and double aging and the heterogeneous nucleation of β1' rods on α-Mn particles in a Mg-6 wt%Zn-1wt%Mn (ZM61) alloy were studied by TEM technique. Age-hardening curves (130, 160, 180, 200 and 230°C) show that double aging can more greatly enhance hardening level and rate than single aging. The rapid nucleation and the elongation of β1' rods occupies the stage before peak aging; the volume fraction increase of β1' rods results in hardness rise and also a huge accumulation of strain energy; in the over-aging stage the growth of β2' discs at the cost of β1' rods can effectively relieve such a strain energy accumulation. G. P. zones of about 10 nm in diameter are densely distributed in matrix after the pre-aging (90°C/24 h), which can act as the heterogeneous nuclei for β1' rods and thus considerably raise their number density. Moreover, β1' rods frequently heterogeneously nucleate on α-Mn particles, because such heterogeneous nucleation can result in a coherent β1'/α-Mn interface and thus reduce the interfacial energy. Copyright © 2013, Northwest Institute for Nonferrous Metal Research. Published by Elsevier BV. All rights reserved.

引用

页码：2447 / 2452

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