Effect of Al2Gd on microstructure and properties of laser clad Mg-Al-Gd coatings

被引：17
作者：
Chen, Hong [1 ]
Zhang, Ke [1 ]
Yao, Chengwu [1 ]
Dong, Jie [2 ]
Li, Zhuguo [1 ]
Emmelmann, Claus [3 ]
机构：
[1] Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Shanghai Key Lab Mat Laser Proc & Modificat, Shanghai 200240, Peoples R China
[2] Shanghai Jiao Tong Univ, Sch Mat Sci & Engn, Natl Engn Res Ctr Light Alloy Net Forming, Shanghai 200240, Peoples R China
[3] Hamburg Univ Technol, Inst Laser & Syst Technol, D-21073 Hamburg, Germany
来源：
APPLIED SURFACE SCIENCE | 2015年 / 330卷
关键词：
Gadolinium; Magnesium alloy; Laser cladding; Microstructure; Property; STRAIN-HARDENING BEHAVIOR; AZ91D MAGNESIUM ALLOY; MECHANICAL-PROPERTIES; TENSILE PROPERTIES;
D O I：
10.1016/j.apsusc.2014.11.132
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：
In order to investigate the effects of Gd addition on the microstructures and properties of magnesium coatings, the Mg-7.5A1-xGd (x= 0, 2.5, 5.0 and 7.5 wt.%) coatings on cast magnesium alloy were fabricated by laser cladding with wire feeding. The results indicated that the gadolinium (Gd) addition led to the formation of a cubic Al2Gd phase as well as suppressed the precipitation of eutectic Mg17Al12 phase. The laser clad coating containing nominally 7.5 wt.% Gd presented the highest microhardness, ultimate tensile strength and yield strength at both room temperature and high temperatures. The enhancement of heat resistant capacities was chiefly attributed to the existence of thermally stable Al2Gd particles, which prevented tiny liquation of eutectic phases along the grain boundaries and made great contributions on maintaining high yield ratio during high-temperature deformation. (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码：393 / 404
页数：12
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