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.
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页数：6
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