热处理对Mg-3.4Al-2Ca合金组织与力学性能的影响  

Effects of Heat Treatment on Microstructure and Mechanical Properties of Mg-3.4Al-2Ca Alloy

作　　者：代芳芳 姜中涛[2] DAI Fangfang;JIANG Zhongtao(Southwest Aluminum(Group)Co.,Ltd.,Chongqing 401326,China;Chongqing Key Laboratory of Materials Surface&Interface Science,Chongqing University of Arts and Sciences,Chongqing 402160,China)

机构地区：[1]西南铝业(集团)有限责任公司,重庆401326 [2]重庆文理学院材料表界面科学重庆市重点实验室,重庆402160

出　　处：《热加工工艺》2022年第8期132-134,138,共4页Hot Working Technology

基　　金：重庆市科技局基础前沿研究项目(CSTC2018JSYJAX0427);重庆市教育委员会科学技术研究项目(KJQN201801306)。

摘　　要：对铸态Mg-3.4Al-2Ca合金进行先固溶热处理,再进行热挤压变形处理,研究了固溶热处理对铸态和挤压态合金组织以及挤压态合金力学性能的影响。结果表明,与未固溶处理相比,高温固溶处理可使镁合金中亚稳(Mg,Al)2Ca相转变为稳定的Al_(2)Ca相。挤压后合金发生完全再结晶,晶粒细小均匀,Al_(2)Ca第二相破碎成颗粒状,且有大量亚微米级Al_(2)Ca分布于合金中。固溶处理再挤压合金比仅固溶处理合金的屈服强度、抗拉强度和伸长率分别提高了25.0%、9.5%和15.1%。The cast Mg-3.4Al-2Ca alloy was firstly treated by solid solution heat treatment and then by hot extrusion deformation.The effects of solid solution heat treatment on the microstructure of cast and extruded alloy and mechanical properties of extruded alloy were investigated.The results show that,compared with the nosolution treatment,the substable(Mg,Al)_(2)Ca phase can be transformed into stable Al_(2)Ca phase by high temperature solution treatment.The alloy is completely recrystallized after extrusion and the grain is fine and uniform,the Al_(2)Ca second phase is broken into granular form and a large number of submicron Al_(2)Ca are distributed in the alloy.The yield strength,tensile strength and elongation of the solid solution treated and extruded alloy companed with that of only solution treatment alloy increase by 25.0%,9.5%and 15.1%,respectively.

关 键 词：Mg-Al-Ca合金 固溶处理 挤压变形 Al_(2)Ca 

分 类 号：TG166.4[金属学及工艺—热处理]