On grain coarsening and refining of the Mg-3Al alloy by Sm

被引：30
作者：
Hu, Xiaoyu [1 ,2 ,3 ]
Fu, Penghuai [1 ,2 ]
StJohn, David [3 ]
Peng, Liming [1 ,2 ]
Sun, Ming [1 ,2 ]
Zhang, Mingxing [3 ]
机构：
[1] Shanghai Jiao Tong Univ, Natl Engn Res Ctr Light Alloy Net Forming, 800 Dongchuan Rd, Shanghai 200240, Peoples R China
[2] Shanghai Jiao Tong Univ, State Key Lab Met Matrix Composites, 800 Dongchuan Rd, Shanghai 200240, Peoples R China
[3] Univ Queensland, Sch Mech & Mat Engn, Ctr Adv Mat Proc & Mfg, St Lucia, Qld 4072, Australia
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2016年 / 663卷
基金：
澳大利亚研究理事会; 中国国家自然科学基金;
关键词：
Solidification; Metals and alloys; Rare earth compounds; Nucleation; MECHANICAL-PROPERTIES; MAGNESIUM ALLOYS; REFINEMENT; MICROSTRUCTURE; AZ31; NUCLEATION; ADDITIONS; CRYSTALLOGRAPHY; ALUMINUM; POTENCY;
D O I：
10.1016/j.jallcom.2015.11.193
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The effect of Sm on the microstructure of a Mg-3Al alloy has been investigated where it was found that the size of the primary alpha-Mg grains was significantly coarsened by the addition of 0.7 wt. % Sm, but dramatically refined by 2.1 wt. % Sm. It is proposed that the coarsening effect of Sm is due to a decrease in the nucleation potency of the native Al-Fe-C-O particles when they transform to the lower potency Al-Fe-Sm-C-O particles. The grain refinement observed when 2.1 wt. % Sm is added, is caused by the formation of potent Al2Sm nucleant particles prior to the solidification of alpha-Mg. The "Interdependence Theory" was then applied to describe the nucleant selection process in the Mg-3Al-2.1Sm alloy. (C) 2015 Elsevier B.V. All rights reserved.
引用
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页码：387 / 394
页数：8
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