Effect of extrusion speed on microstructure and mechanical properties of the Mg-Ca binary alloy

作     者：Jingren Li Aiyue Zhang Hucheng Pan Yuping Ren Zhuoran Zeng Qiuyan Huang Changlin Yang Lifeng Ma Gaowu Qin Jingren Li;Aiyue Zhang;Hucheng Pan;Yuping Ren;Zhuoran Zeng;Qiuyan Huang;Changlin Yang;Lifeng Ma;Gaowu Qin

作者机构：Key Laboratory for Anisotropy and Texture of Materials(Ministry of Education)School of Materials Science and EngineeringNortheastern UniversityShenyang 110819China State Key Laboratory of Rolling and AutomationNortheastern UniversityShenyang110819China Department of Materials Science and EngineeringMonash UniversityVic.3800Australia Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China State Key Laboratory of Solidification ProcessingNorthwestern Polytechnical UniversityXi’anShaanxi 710072China Shanxi Provincial Key Laboratory of Metallurgical Equipment Design and TechnologyTaiyuan University of Science and TechnologyTaiyuan 030024China 

出 版 物：《Journal of Magnesium and Alloys》 (镁合金学报（英文）)

年 卷 期：2021年第9卷第4期

页      面：1304-1310页

核心收录：

学科分类：08[工学] 0806[工学-冶金工程] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0802[工学-机械工程] 0703[理学-化学] 080201[工学-机械制造及其自动化] 0801[工学-力学（可授工学、理学学位）] 

基　　金：This work is supported by National Natural Science Foundation of China(Nos.51525101,U1610253,51701211,and 51971053) funded by the Project of Promoting Talents in Liaoning province(No.XLYC1808038) H.C.Pan acknowledges the financial assistance from the State Key Laboratory of Solidification Processing in NPU(No.SKLSP201920) the Fundamental Research Funds for the Central Universities(No.N2002011) joint R&D fund of Liaoning-Shenyang National Research Center for Materials Science(No.2019JH3/30100040). 

主　　题：Extrusion speed Microstructure Mechanical properties Mg-Ca alloy 

摘      要：This work reported the effect of extrusion speeds on the microstructures and mechanical properties of Mg-Ca binary alloy.The results showed that yield strength of the as-extruded Mg-1.2wt.%Ca alloys decrease from∼360MPa to∼258MPa as the ram speed increases from 0.4mm/s to 2.4 mm/s,and the elongation increases from∼3.9%to∼12.2%.The microstructure changes from bimodal grain feature to the complete dynamical recrystallization(DRX)with increase of the extrusion speed.The ultrafine DRXed grains in size of∼0.85μm,the numerous nano-Mg_(2)Ca particles dispersing along the grain boundaries and interiors,as well as the high density of residual dislocations,should account for the high strength.It is believed that the high degree of dynamic recrystallization and the resulting texture randomization play the critical roles in the ductility enhancement of the high-speed extruded Mg alloys.