标题：Effect of er on microstructure and mechanical properties of as-cast Mg-6Al magnesium alloys [稀土Er对铸态Mg-6Al合金显微组织和力学性能的影响]
作者：Cui H.-W.; Zhang T.-T.; Yu H.; Jia Q.-R.; Cui X.-L.; Chen H.-M.; Zhai S.-B.; Chai S.-C.;等
作者机构：[Cui, H.-W] School of Materials Science and Engineering, Shandong University of Technology, Zibo, Shandong 255000, China;[ Zhang, T.-T] School of Mat 更多
通讯作者地址：[Min, G.-H] Key Laboratory for Liquid-Solid Structural Evolution & Processing of Materials, Ministry of Education, Shandong UniversityChina;
关键词：Erbium; Magnesium alloy; Mechanical property; Microstructure
摘要：The influence of Er addition on microstructural evolution and related mechanical properties of as-cast Mg-6Al (wt. %) alloys were systematically investigated by using OM, XRD, SEM/EDS and tensile tests. The results show that, the new phase Al3Er phases appeared, and proper amount of Er addition into Mg-6Al alloys resulted in significant enhanced mechanical properties. Besides, the grain size reduced as well as the morphology of second particles changed from continuous or discontinuous net-like to short rod/ granule by Er addition. In addition, the size of the second phases was also refined and its distribution became more uniformly. However, the mechanical properties degraded with more than 1.5% Er addition. The improved ultimate tensile strength and elongation were attributed to synergic effects of grain refinement strengthening and the second particles strengthening. The proper amount of Er addition is 1.0%, the tensile strength is 181 MPa, elongation is 9.3%. The grain refinement mechanism and effect of Er on second phases inMg-6Al alloys were also discussed. © 2017, Chinese Mechanical Engineering Society. All right reserved.