热处理对挤压铸造Mg93YZn6合金组织和性能的影响  

Effects of High Temperature Heat Treatment on Microstructure and Properties of Squeeze Casting Mg93YZn6 Magnesium Alloy

作　　者：王冰[1] 赵宇宏[1] 靳玉春[1] 田晋忠 侯华[1] Wang Bing;Zhao Yuhong;Jin Yuchun;Tian Jinzhong;Hou Hua(School of Materials Science and Engineering,North University of China)

机构地区：[1]中北大学材料科学与工程学院

出　　处：《特种铸造及有色合金》2020年第3期282-285,共4页Special Casting & Nonferrous Alloys

基　　金：国家自然科学基金资助项目(51774254,51774253,51701187,U1610123,51674226,51574207,51574206);山西省科技重大专项基金资助项目(MC2016-06)。

摘　　要：采用挤压铸造法制备了Mg93YZn6合金,并对其进行高温热处理,分析了铸态和热处理态的Mg93YZn6合金的微观组织、显微硬度和力学性能。结果表明,该合金的挤压铸造和热处理后的组织中均只有α-Mg基体相和准晶I相生成。经500℃×4h热处理后,合金中的准晶相含量与铸态合金中变化不大。经550℃×2h热处理后,合金中的准晶相有所减少。与铸态合金相比,热处理后合金的硬度、抗拉强度和伸长率均提高。Mg93YZn6 alloy was prepared by squeeze casting,and then it was treated by heat treatment at high temperature.The microstructure,microhardness and mechanical properties of the as-cast and heat-treated Mg93YZn6 alloy were analyzed by OM,SEM and tensile testing.The results reveal that theα-Mg matrix and the qusaicrystal I-phase are generated in the microstructure after squeeze casting and heat treatment.After heat treatment at 500℃for 4 h,the content of quasicrystal phase can be ignored for change in the as-cast alloy.The quasicrystal phase is decreased after heat treatment at 550℃for 2 h.Compared with those of the as-cast alloy,the hardness,tensile strength and elongation of the alloy are all improved,especially elongation after heat treatment.

关 键 词：Mg93YZn6合金 准晶相 挤压铸造 热处理 力学性能 

分 类 号：TG146.22[一般工业技术—材料科学与工程] TG249.2[金属学及工艺—金属材料]