预变形对AZ31镁合金高应变速率热轧组织及力学性能的影响  

Effect of pre-deformation on microstructure and mechanical properties of AZ31 magnesium alloy during high strain rate hot rolling

作　　者：肖罡 杨伟成 朱必武[2] 刘筱[2] 刘晓红[3] XIAO Gang;YANG Wei-cheng;ZHU Bi-wu;LIU Xiao;LIU Xiao-hong(Collaborative Innovation Center of Engineering Technology,Jiangxi University of Applied Science,Nanchang 330100,China;Hunan Engineering Research Center of Forming Technology and Damage Resistance Evaluation for High Efficiency Light Alloy Components,Hunan University of Science and Technology,Xiangtan 411201,China;College of Mechanical Engineering,Jiujiang Vocational and Technical College,Jiujiang 332007,China)

机构地区：[1]江西应用科技学院工程技术协同创新中心,江西南昌330100 [2]湖南科技大学高功效轻合金构件成形技术及耐损伤性能评价湖南省工程研究中心,湖南湘潭411201 [3]九江职业技术学院机械工程学院,江西九江332007

出　　处：《塑性工程学报》2021年第11期11-17,共7页Journal of Plasticity Engineering

基　　金：国家自然科学基金资助项目(52071139,51905166);华南理工大学国家金属材料近净成形工程技术研究中心开放基金资助项目(2020013);湖南省自然科学基金资助项目(2020JJ5198);江西省教育厅科学技术研究项目(GJJ191277)。

摘　　要：为研究预变形对高应变速率轧制AZ31镁合金微观组织和力学性能的影响,对预变形和未变形的AZ31镁合金进行平均应变速率分别为10、20和29 s^(-1),变形温度分别为350和400℃,下压量为78%的高应变速率轧制。结果表明:在平均应变速率10 s^(-1)时,400℃相较350℃,预变形AZ31镁合金的组织更加均匀;在平均应变速率为20和29 s^(-1)时,预变形AZ31镁合金的组织并未随着温度的升高逐渐趋于均匀。在350℃、平均应变速率为20和29 s^(-1)时,预变形AZ31镁合金轧板的抗拉强度和伸长率各向异性不明显。经过350和400℃高应变速率轧制后,预变形AZ31镁合金终轧板材的组织相较未预变形AZ31镁合金更加均匀细小,因此预变形AZ31镁合金板材的力学性能相比于未预变形AZ31镁合金板材明显提升。To study the effect of pre-deformation on microstructure and mechanical properties of AZ31 magnesium alloy with high strain rate rolling,high strain rate rolling was carried out on AZ31 magnesium alloy without pre-deformation and with pre-deformation at average strain rates of 10,20 and 29 s^(-1) and deformation temperatures of 350 and 400℃ with 78% reduction.The results show that at the average strain rate of 10 s^(-1),the microstructure of AZ31 magnesium alloy with pre-deformation at 400℃ is more uniform compared with that at 350℃.At the average strain rate of 20 and 29 s^(-1),the microstructure is not gradually uniform with the increase of temperature.The anisotropy of tensile strength and elongation of pre-deformed AZ31 magnesium alloy rolled at 350℃ and the average strain rate of 20 and29 s^(-1) is not obvious.After high strain rate rolling at 350 and 400℃,the mechanical properties of the pre-deformed AZ31 magnesium alloy sheets are significantly improved in contrast to those of AZ31 magnesium alloy sheets without pre-deformation,so the microstructure of pre-deformed AZ31 magnesium alloy is more uniform and finer than that of AZ31 magnesium alloy without pre-deformation.

关 键 词：AZ31镁合金 高应变速率轧制 预变形 各向异性 力学性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]