摘要
对铸态AZ61镁合金进行不同参数搅拌摩擦加工(FSP),研究工艺参数对其组织演变及力学行为的影响。结果表明:FSP过程中合金发生了动态再结晶,显著细化了晶粒;随着ω/υ(旋转速度/加工速度)比值的提升,晶粒尺寸随之增大,大角度晶界比例也随之增加,位错密度下降。相比于母材,加工后的AZ61镁合金硬度及拉伸性能有明显的提高,主要受益于晶界强化,高比例的大角度晶界及弱化的织构有利于提高FSP试样的强度及塑性。
Friction stir processing(FSP)with different parameters was carried out on as-cast AZ61 magnesium alloy,and the influence of process parameters on its microstructure evolution and mechanical behavior was studied.The results show that the dynamic recrystallization occurs during the FSP of the alloy,which significantly refines the grain;with the increase of the ratio ofω/υ(rotation speed/processing speed),the grain size and the proportion of large angle grain boundary increase,and the dislocation density decreases.The hardness and tensile properties of the AZ61 magnesium alloy processed by FSP are obviously improved compared to the base metal,which mainly benefit from grain boundary strengthening,and the high proportion of large angle grain boundaries and the weakened texture are beneficial to improve the strength and plasticity of the FSP samples.
作者
罗锡才
刘灏霖
康利梅
刘怡飞
诸进才
张大童
李助军
LUO Xi-cai;LIU Hao-lin;KANG Li-mei;LIU Yi-fei;ZHU Jin-cai;ZHANG Da-tong;LI Zhu-jun(Department of Electrical and Mechanical Engineering,Guangzhou Railway Polytechnic,Guangzhou 510430,China;Guangdong Provincial Key Laboratory for Processing and Forming of Advanced Metallic Materials,South China University of Technology,Guangzhou 510641,China)
出处
《材料热处理学报》
EI
CAS
CSCD
北大核心
2020年第9期139-146,共8页
Transactions of Materials and Heat Treatment
基金
广东普通高校重点项目(自然)(2019GZDXM015)
广州铁路职业技术学院教科研重点项目(GTXYZ1901)。
关键词
镁合金
搅拌摩擦加工
工艺参数
组织
织构
力学性能
magnesium alloy
friction stir processing
processing parameter
microstructure
texture
mechanical property
作者简介
罗锡才(1983-),男,特聘副教授,博士,主要研究方向为轻质合金塑性变形及材料连接,发表论文10余篇,电话:020-36875608,E-mail:meluoxicai@mail.scut.edu.cn;通信作者:刘灏霖(1974-),男,实验师,本科,主要研究方向为金属材料加工,发表论文5篇,专利7项,电话:020-36875608,E-mail:starcity_lhl@163.com。
