Study on Microstructure and Mechanical Properties of Mg9AlZnGdY Magnesium Alloy after T6 in Lost Foam Casting

被引：0
|
作者：
Zhao, Zhong [1 ]
Luo, Qiang [2 ]
Fan, Zi Tian [2 ]
机构：
[1] Ningbo Univ Technol, Sch Mech Engn, Ningbo 315016, Zhejiang, Peoples R China
[2] Huazhong Univ Sci & Technol, State Key Lab Mat Proc & Die & Mould Technol, Wuhan 430074, Peoples R China
来源：
MATERIALS PROCESSING TECHNOLOGY, PTS 1-4 | 2011年 / 291-294卷
基金：
浙江省自然科学基金; 国家高技术研究发展计划(863计划);
关键词：
Magnesium alloy; lost foam casting (LFC); microstructure; mechanical property;
D O I：
10.4028/www.scientific.net/AMR.291-294.565
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The microstructures and mechanical properties of Mg9A1ZnGdY alloy after T6 heat treatment in lost foam casting (LFC) are compared with that of AZ91D magnesium alloy. The results show that the microstructures of Mg9AIZnGdY alloy after T6 heat treatment consist of the alpha-Mg solid solution, beta-Mg17Al12 precipitation phase, a small amount of rod Al2Y and block Al2Gd phases, which are distributed over grain boundaries of the alpha-Mg phase. The thermal stability of Al2Y and Al2Gd phases offers the pinning effect on the grain boundary under high temperature, and therefore, the grain boundary sliding is eliminated and the high-temperature strength is increased. After the 16 heat treatment, the tensile strength of Mg9A1ZnGdY alloy was 235MPa at room temperature, and 156MPa at 200 degrees C. Compared with that of AZ91 D alloy, the tensile strength was increased by 19.3% and 38.1% respectively.
引用
收藏
页码：565 / +
页数：2
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