电脉冲对轧制AZ31镁合金组织与性能的影响  

Effect of Electropulsing Treatment on Microstructure and Properties of Rolled AZ31 Alloy

作　　者：刘阳[1] 樊建锋[1] 靳伟[1] 张华[1] 董洪标[1] 许并社[1] 

机构地区：[1]太原理工大学新材料界面科学与工程教育部重点实验室,山西太原030024

出　　处：《稀有金属材料与工程》2016年第10期2687-2691,共5页Rare Metal Materials and Engineering

基　　金：教育部新世纪优秀人才支持计划(NCET-12-1040);教育部科学技术研究重点项目(2012017);国家留学基金(201308140098);国家自然科学基金(50901048;51174143);山西省高等学校科技创新项目(2014118)

摘　　要：研究了电脉冲处理(EPT)对轧制变形AZ31镁合金组织演化与力学性能的影响。使用脉冲电源产生的高电流密度低占空比电脉冲促进了变形AZ31镁合金内部的再结晶进程。通过对不同参数脉冲处理的对比分析,研究了电脉冲的热效应与非热效应的作用,揭示了电脉冲促进再结晶的作用机理。结果表明:AZ31镁合金经过脉宽为20ms、电流密度3.508×109A/m^2、占空比为0.002的电脉冲处理5.5 min后,在电脉冲的非热作用下发生再结晶,平均晶粒尺寸由72mm减小至2mm,抗拉强度提升85%,达到295 MPa,延伸率达到20%。In this paper, the effect of electroplsing treatment （EPT） on the microstructure evolution and the mechanical properties was studied. The recrystallization of the deformed AZ31 magnesium alloy was accelerated by using EPT with high current density and low duty ratio. EPT with different parameters was analized. The thermal and athermal effect of EPT is researched and the mechanism of the recrystallization under EPT was also revealed. The results indicated that the deformed AZ31 magnesium alloy recrystallized under the EPT for 5.5 minutes. After EPT with a pluse-width of 20 μs, a current density of 3.508×10^9 A/m^2, a duty ratio of 0.002 and a processing time of 5min, the average grain size of AZ31 alloy is refined from 72 μm to 2 μm, the tensile strength is 295 MPa, and the elongation is 20%.

关 键 词：电脉冲处理 AZ31镁合金 再结晶 力学性能 

分 类 号：TG339[金属学及工艺—金属压力加工] TG146.22[一般工业技术—材料科学与工程]