Heterogeneous nucleation of β-type precipitates on nanoscale Zr-rich particles in a Mg-6Zn-0.5Cu-0.6Zr alloy

被引：11

作者：

Zhu, Hongmei ^{[2
,3
,4
]}

Sha, Gang ^{[3
]}

Liu, Jiangwen ^{[2
]}

Liu, Hongwei ^{[3
]}

Wu, Cuilan ^{[1
]}

Luo, Chengping ^{[2
]}

Liu, Zongwen ^{[3
]}

Zheng, Rongkun ^{[3
]}

Ringer, Simon P. ^{[3
]}

机构：

[1] Hunan Univ, Sch Mat Sci & Engn, Ctr High Resolut Elect Microscopy, Changsha 410082, Hunan, Peoples R China

[2] S China Univ Technol, Sch Mat Sci & Engn, Guangzhou 510640, Guangdong, Peoples R China

[3] Univ Sydney, Australian Ctr Microscopy & Microanal, Sydney, NSW 2006, Australia

[4] Univ S China, Sch Mech Engn, Hengyang 421001, Peoples R China

来源：

NANOSCALE RESEARCH LETTERS | 2012年 / 7卷

基金：

澳大利亚研究理事会;

关键词：

Mg alloys; Zn-rich precipitates; nanoscale Zr-rich particles; heterogeneous nucleation; electron microscopy; TRANSMISSION ELECTRON-MICROSCOPY; ZN ALLOY; BEHAVIOR;

D O I：

10.1186/1556-276X-7-300

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Zirconium (Zr) is an important alloying element to Mg-Zn-based alloy system. In this paper, we report the formation of the beta-type precipitates on the nanoscale Zr-rich particles in a Mg-6Zn-0.5Cu-0.6Zr alloy during ageing at 180A degrees C. Scanning transmission electron microscopy examinations revealed that the nanoscale Zr-rich [0001](alpha) rods/laths are dominant in the Zr-rich core regions of the as-quenched sample after a solution treatment at 430A degrees C. More significantly, these Zr-rich particles served as favourable sites for heterogeneous nucleation of the Zn-rich beta-type phase during subsequent isothermal ageing at 180A degrees C. This research provides a potential route to engineer precipitate microstructure for better strengthening effect in the Zr-containing Mg alloys.

引用

页数：6

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