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热处理对砂型铸造Mg-10Gd-3Y-0.5Zr镁合金微观组织和力学性能的影响
引用本文:曹樑,刘文才,李中权,吴国华,肖旅,王少华,丁文江.热处理对砂型铸造Mg-10Gd-3Y-0.5Zr镁合金微观组织和力学性能的影响[J].中国有色金属学会会刊,2014,24(3):611-618.
作者姓名:曹樑  刘文才  李中权  吴国华  肖旅  王少华  丁文江
作者单位:[1]上海交通大学轻合金精密成型国家工程研究中心,上海200240 [2]上海交通大学金属基复合材料国家重点实验室,上海200240 [3]上海航天精密机械研究所,上海201600 [4]空间物理重点实验室,北京100076
摘    要:采用金相分析、SEM、硬度试验和拉伸试验等方法分析和测试砂型铸造 Mg-10Gd-3Y-0.5Zr 镁合金在T6态(固溶后空冷然后时效)下的显微组织和室温力学性能,讨论该合金的断裂机理。结果表明,砂铸Mg-10Gd-3Y-0.5Zr合金在225℃和250℃时效下的最优T6热处理工艺分别为(525℃,12 h+225℃,14 h)和(525℃,12 h+250℃,12 h)。峰时效下T6态Mg-10Gd-3Y-0.5Zr合金主要由α-Mg+γ+β′相组成,2种峰时效热处理工艺下合金的抗拉强度、屈服强度和伸长率分别为339.9 MPa、251.6 MPa、1.5%及359.6 MPa、247.3 MPa、2.7%。在不同热处理工艺下Mg-10Gd-3Y-0.5Zr合金断裂的类型不同,峰时效态合金的断裂方式为穿晶准解理断裂。

关 键 词:Mg-10Gd-3Y-0  5Zr  镁合金  热处理  断裂  微观组织  力学性能
收稿时间:8 April 2013

Effect of heat treatment on microstructures and mechanical properties of sand-cast Mg- 10Gd-3Y-0.5Zr magnesium alloy
Liang CAO,Wen-cai LIU,Zhong-quan LI,Guo-hua WU,Lü XIAO,Shao-hua WANG,Wen-jiang DING.Effect of heat treatment on microstructures and mechanical properties of sand-cast Mg- 10Gd-3Y-0.5Zr magnesium alloy[J].Transactions of Nonferrous Metals Society of China,2014,24(3):611-618.
Authors:Liang CAO  Wen-cai LIU  Zhong-quan LI  Guo-hua WU  Lü XIAO  Shao-hua WANG  Wen-jiang DING
Affiliation:1. National Engineering Research Center of Light Alloy Net Forming, Shanghai Jiao Tong University, Shanghai 200240, China; 2. Key State Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, Shanghai 200240, China; 3. Shanghai Aviation Precision Machinery Research Institute, Shanghai 201600, China; 4. Science and Technology on Space Physics Laboratory, Beijing 100076, China)
Abstract:The microstructure, mechanical properties and fracture behavior of sand-cast Mg-10Gd-3Y-0.5Zr alloy (mass fraction,%) under T6 condition (air cooling after solid solution and then aging heat treatment) were investigated. The optimum T6 heat treatments for sand-cast Mg-10Gd-3Y-0.5Zr alloy are (525 ℃, 12 h+225 ℃, 14 h) and (525 ℃, 12 h+250 ℃, 12 h) according to age hardening curve and mechanical properties, respectively. The ultimate tensile strength, yield strength and elongation of the Mg-10Gd-3Y-0.5Zr alloy treated by the two optimum T6 processes are 339.9 MPa, 251.6 MPa, 1.5%and 359.6 MPa, 247.3 MPa, 2.7%, respectively. The tensile fracture mode of peak-aged Mg-10Gd-3Y-0.5Zr alloy is transgranular quasi-cleavage fracture.
Keywords:Mg-10Gd-3Y-0  5Zr  magnesium alloy  heat treatment  fracture  microstructure  mechanical property
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