| 热处理工艺对高真空压铸Mg–8Gd–3Y–0.4Zr镁合金组织及力学性能的影响 |
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| 引用本文： | 王栀沁,;张彬,;李德江,;Robert FRITZSCH,;曾小勤,;Hans J. ROVEN,;丁文江.热处理工艺对高真空压铸Mg–8Gd–3Y–0.4Zr镁合金组织及力学性能的影响[J].中国有色金属学会会刊,2014,24(12):3762-3768. |
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| 作者姓名： | 王栀沁 ;张彬 ;李德江 ;Robert FRITZSCH ;曾小勤 ;Hans J. ROVEN ;丁文江 |
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| 作者单位： | [1]上海交通大学材料科学与工程学院,轻合金精密成型国家工程研究中心,上海200240; [2]Department of Materials Science and Engineering, Norwegian University of Science and Technology, Trondheim 7491, Norway; [3]上海交通大学金属基复合材料国家重点实验室,上海200240; [4]Center for Advanced Materials, Qatar University, Doha POB 2713, Qatar |
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| 基金项目： | Projects（51171113,51301107）supported by the National Natural Science Foundation of China; Projects（2012M511089,2013T60444）supported by the China Postdoctoral Science Foundation; Projects（2011BAE22B02,2011DFA50907）supported by the Ministry of Science and Technology of China |
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| 摘 要： | 研究T4和T6热处理状态下高真空压铸Mg-8Gd-3Y-0.4Zr（质量分数,%）合金的微观组织、化合物含量、力学性能及断裂行为。铸态Mg-8Gd-3Y-0.4Zr合金微观组织主要由α-Mg和共晶Mg24（Gd,Y）5化合物组成。经固溶处理后,共晶化合物大量溶解于镁基体,合金主要含过饱和α-Mg及方块相。固溶合金中方块相的含量随固溶温度的升高而增大,力学性能也有所提高。根据微观组织结果,确定475℃,2 h为Mg-8Gd-3Y-0.4Zr合金最优固溶方案。合金的最佳屈服强度为222.1 MPa,延伸率可达15.4%。铸态,T4状态下和T6状态下合金的拉伸断裂模式为穿晶准解理断裂。
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| 关 键 词： | Mg–8Gd–3Y–0.4Zr合金 热处理工艺 微观组织 力学性能 断裂行为 |
| 收稿时间： | 17 October 2013 |
Effect of heat treatment on microstructures and mechanical properties of high vacuum die casting Mg-8Gd-3Y-0.4Zr magnesium alloy |
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| Zhi-qin WANG,Bin ZHANG,De-jiang LI,Robert FRITZSCH,Xiao-qin ZENG,Hans J. ROVEN,Wen-jiang DING.Effect of heat treatment on microstructures and mechanical properties of high vacuum die casting Mg-8Gd-3Y-0.4Zr magnesium alloy[J].Transactions of Nonferrous Metals Society of China,2014,24(12):3762-3768. |
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| Authors: | Zhi-qin WANG Bin ZHANG De-jiang LI Robert FRITZSCH Xiao-qin ZENG Hans J ROVEN Wen-jiang DING |
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| Affiliation: | Zhi-qin WANG, Bin ZHANG, De-jiang LI, Robert FRITZSCH, Xiao-qin ZENG, Hans J ROVEN, Wen-jiang DING (1. National Engineering Research Center of Light Alloy Net Forming, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; 2. Department of Materials Science and Engineering, Norwegian University of Science and Technology, Trondheim 7491, Norway; 3. Key State Laboratory of Metal Matrix Composite, Shanghai Jiao Tong University, Shanghai 200240, China; 4. Center for Advanced Materials, Qatar University, Doha POB 2713, Qatar) |
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| Abstract: | The microstructure, the content of compounds, mechanical properties and fracture behavior of high vacuum die casting Mg-8Gd-3Y-0.4Zr alloy （mass fraction, %） under T4 condition and T6 condition were investigated. The microstructure for the as-cast Mg-8Gd-3Y-0.4Zr alloy mainly consists ofα-Mg and eutectic Mg24（Gd,Y）5 compound. After solution treatment, the eutectic compounds dissolve massively into the Mg matrix. The main composition of solution-treated alloys is supersaturated α-Mg and cuboid-shaped phase. The T4 heat treated samples have increasing cuboidal particles with the increase of heat treatment temperature, which turn out good mechanical properties. The optimum T4 heat treatment for high vacuum die cast Mg-8Gd-3Y-0.4Zr alloy is 475 ℃, 2 h according to microstructure results. The optimum ultimate strength and elongation of solution-treated Mg-8Gd-3Y-0.4Zr alloy are 222.1 MPa and 15.4%, respectively. The tensile fracture mode of the as-cast, and T6 heat treated alloys is transgranular quasi-cleavage fracture. |
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| Keywords: | Mg-8Gd-3Y-0 4Zr alloy heat treatment microstructure mechanical property fracture behavior |
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