热拉拔工艺对AZ61镁合金丝材组织与性能的影响  

Effect of hot-drawn conditions on microstructure and mechanical properties of AZ61 magnesium alloy wires

作　　者：陈庆强 赵志浩[1] 王高松 朱庆丰 朱成[1,2] 苏菲 Chen Qingqiang;Zhao Zhihao;Wang Gaosong;Zhu Qingfeng;Zhu Cheng;Su Fei(School of Materials Science ＆ Engineering,Northeastern University,Shenyang 110819,China;Key Laboratory of Electron,agnetic Processing of Materials,Ministry of Education,Northeastern University,Shenyang 110819,China;Shenyang Northeastern Institute of Metal Materials Co.Ltd.,Shenyang 110819,China)

机构地区：[1]东北大学材料科学与工程学院,沈阳110819 [2]东北大学材料电磁过程研究教育部重点实验室,沈阳110819 [3]沈阳东北金属材料研究院有限公司,沈阳110819

出　　处：《材料与冶金学报》2018年第2期146-152,共7页Journal of Materials and Metallurgy

基　　金：辽宁省博士启动基金(20170520403);辽宁省科技项目重点实验室(Z2015040);教育部基本科研业务费重大科技创新项目(N160212001;N160913002)

摘　　要：采用自制热拉拔装置将AZ61镁合金粗挤压棒材拉拔成丝,研究拉拔温度、道次变形量等热拉拔工艺对单道次拉拔后丝材组织、力学性能的影响规律,并对拉拔过程中断丝情况进行统计,确定能够实现稳定热拉拔的工艺参数范围.结果表明,当道次变形量为15%时,随着温度的升高,丝材中的孪晶组织逐渐减少,强度逐渐降低,延伸率逐渐升高,丝材在350℃时发生动态再结晶.当拉拔温度一定时,随着道次变形量的增加,丝材的加工硬化程度增加,强度、硬度升高,延伸率下降.但当拉拔温度为300℃,道次变形量增加到25%时,丝材发生动态再结晶,使强度硬度下降,延伸率升高.过高的拉拔温度和道次变形量会使丝材发生断裂,随着温度的提高,丝材所能承受的最大变形量逐渐减小.The thick AZ61 magnesium alloy rod was drawn into wire by a self-made hot-drawing equipment.An effects of drawing temperature and deformation degree on the microstructure and mechanical properties of hot-drawn AZ61 wires were investigated. The fracture situation was summarized. The results demonstrated that density of by crystal and strength decrease with drawing temperature increasing when deformation degree is 15%,while elongation increases. Dynamic recrystallization occurs when temperature is 350 ℃. When temperature is constant,with deformation degree increasing,the working hardening increases,the strength increases and ductility decreases. The only exception is that the recrystallization occurs at 300 ℃ when deformation degree is 25%,causing deterioration of the mechanical properties. Excessive drawing temperature and deformation degree results in the fracture of wires. With temperature increasing,the deformation degree decreases gradually.

关 键 词：AZ61 丝材 热拉拔 显微组织 力学性能 

分 类 号：TG356.47[金属学及工艺—金属压力加工]