轧制温度和轧制道次对Mg-1RE-0.5Zn-0.5Zr合金组织和性能的影响  

Effect of Rolling Temperature and Rolling Pass on Microstructure and Properties of Mg-1RE-0.5Zn-0.5Zr Alloy

作　　者：连全勇 王立新[3] 袁峰[3] 胡文鑫[4] 吴广新[1,2] 张捷宇 LIAN Quanyong;WU Guangxin;MA Zheng;ZHANG Jieyu;HU Wenxin(School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China;State Key Laboratory of Advanced Special Steel, Shanghai University, Shanghai 200444, China;State Key Laboratory of Baiyunobo Rare Earth Resources Researches and Comprehensive Utilization, Baotou Research Institute of Rare Earths, Baotou Nei Mongol 014030, China)

机构地区：[1]上海大学材料科学与工程学院,上海200444 [2]省部共建高品质特殊钢冶金与制备国家重点实验室,上海200444 [3]泛亚汽车技术中心有限公司,驱动部,上海201208 [4]包头稀土研究院白云鄂博稀土资源研究与综合利用国家重点实验室,内蒙古包头014030

出　　处：《上海金属》2020年第5期105-110,共6页Shanghai Metals

基　　金：泛亚汽车技术中心有限公司资助项目（PS23024335）;白云鄂博稀土资源研究与综合利用国家重点实验室开放课题。

摘　　要：利用扫描电镜(SEM)、X射线衍射仪、电子万能试验机和激光导热仪研究了轧制温度和轧制道次对Mg-1RE-0.5Zn-0.5Zr合金组织和性能的影响。结果表明:铸态Mg-1RE-0.5Zn-0.5Zr合金主要由镁基体(α-Mg)和沿晶界分布的LaMg12、CeMg12第二相组成。经过轧制变形后,合金的晶粒细化,力学性能得到改善。当轧制温度相同时,合金的抗拉强度随着轧制道次的增加而提高。当轧制道次相同时,轧制温度越高,合金的抗拉强度越高。在相同的轧制温度下,合金的断后伸长率随着轧制道次的增加先降低后升高。轧制退火态合金的抗拉强度低于轧制态合金,这是由于退火处理后晶粒长大,合金的抗拉强度略有降低。合金在410℃轧制不同道次时的热导率较高,3道次轧制的最高,达146.678 W/(m·K),比铸态合金提高了20.9%。410和450℃轧制退火态合金的热导率相比轧制态的变化不明显。Effect of rolling temperature and rolling pass on microstructure and properties of Mg-1RE-0.5Zn-0.5Zr alloy were studied by using scanning electron microscope(SEM),x-ray diffractometer(XRD),electronic universal testing machine and laser thermalconduction apparatus.The results showed that the as-cast Mg-1RE-0.5Zn-0.5Zr alloy mainly consisted ofα-Mg matrix,LaMg12 and CeMg12 second phases distributed along the grain boundaries;and that the grains of the alloy were refined and the mechanical properties were improved after rolling.When the rolling temperature was the same,the tensile strength of the alloy increased with the increase of rolling passes.When the rolling passes were the same,the higher the rolling temperature,the higher the tensile strength.The elongation of the alloy decreased first and then increased with the increase of rolling passes at the same rolling temperature.The tensile strength of the rolled-and-annealed alloys was lower than that of the as-rolled alloys,which stemmed from the grains growth after annealing,resulting in a slight reduction in its tensile strength.The thermal conductivity of the alloy rolled at 410℃with one to five passes was higher,and the highest value was 146.678 W/(m·K)after rolling with three passes,which was 20.9%higher than that of the as-cast alloy.The thermal conductivity of the alloy rolled at 410℃or 450℃and then annealed had no obvious difference compared with that of the as-rolled one.

关 键 词：Mg-1RE-0.5Zn-0.5Zr合金 轧制温度 轧制道次 力学性能 导热性能 

分 类 号：TG1[金属学及工艺—金属学]