Microstructure Evolution and Age-hardening Behavior of Mg-Sm-Ca Alloy Processed by High Pressure Torsion
LIU Xiaohuan, LI Yansheng, MAN Yi, WANG Jinhui, XU Rui
State Key Laboratory of Metastable Materials Science and Technology, Hebei Key Laboratory of Optimizing Metal Product Technology and Performance, College of Materials Science and Engineering, Yanshan University, Qinhuangdao 066004, China
Abstract: The microstructure and mechanical properties of Mg-Sm-Ca alloy were investigated by combining high pressure torsion (HPT) and aging treatment. Optical microscope (OM), scanning electron microscope (SEM), transmission electron microscope (TEM), microhardness test, and X-ray diffraction (XRD) analysis results show that nanocrystalline Mg-Sm-Ca alloy were successfully produced after HPT, and the grain size refined from 209 μm to 108 nm. The peak hardness reached 134HV aged at 175 ℃ for 1.5 h, which was about twice the as-cast sample. The structure is still nanocrystalline and has certain anti-recovery and high thermal stability, and a large amount of nano-scale precipitates is introduced, which is different from conventional cold deformed alloys. The HPT-treated Mg-Sm-Ca alloy exhibits a strong (0002) basal texture, and the aging treatment promotes basal slip. the texture of the alloy becomes weaker after aging time is prolonged.
刘晓欢, 李彦生, 满意, 王金辉, 徐瑞. 高压扭转制备的Mg-Sm-Ca合金组织演变及时效硬化行为[J]. 材料导报, 2021, 35(6): 6120-6125.
LIU Xiaohuan, LI Yansheng, MAN Yi, WANG Jinhui, XU Rui. Microstructure Evolution and Age-hardening Behavior of Mg-Sm-Ca Alloy Processed by High Pressure Torsion. Materials Reports, 2021, 35(6): 6120-6125.
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2021, Vol. 35 
