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Effect of Partially Substituting Ca with Mischmetal on the Microstructure and Mechanical Properties of Extruded Mg-Al-Ca-Mn-Based Alloys

Effect of Partially Substituting Ca with Mischmetal on the Microstructure and Mechanical Properties of Extruded Mg-Al-Ca-Mn-Based Alloys

作     者:Chao Xu Taiki Nakata Guo-Hua Fan Kosuke Yamanaka Guang-Ze Tang Lin Geng Shigeharu Kamado 

作者机构:School of Materials Science and Engineering Harbin Institute of Technology Department of Mechanical Engineering Nagaoka University of Technology 

出 版 物:《Acta Metallurgica Sinica(English Letters)》 (金属学报(英文版))

年 卷 期:2019年第32卷第2期

页      面:205-217页

核心收录:

学科分类:080503[工学-材料加工工程] 08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程(可授工学、理学学位)] 0802[工学-机械工程] 080201[工学-机械制造及其自动化] 

基  金:supported by JSPS Grant-in-Aid for Young Scientists(B),16K18266 JST Advanced Low Carbon Technology Research and Development Program(ALCA),12102886 

主  题:Magnesium alloys Extrusion Microstructures Precipitation Mechanical properties 

摘      要:Mg-2Al-1.2Ca-0.2Mn(at%)-based alloys with Ce-rich mischmetal(MM) substitution of 0–0.6 at% for Ca were hot extruded at 400 °C. The effect of MM substitution on the microstructure and mechanical properties of the extruded alloys was investigated. The as-cast Mg-2Al-1.2Ca-0.2Mn alloy is mainly composed of a-Mg, Mg_2Ca and(Mg,Al)_2Ca phases and Al_8Mn_5 precipitates, whereas the substitution of MM brings about the formation of Al_(11)MM_3, Al_2MM phases and Al_(10)MM_2Mn_7 particles with the absence of (Mg,Al)_2Ca phase. The volume fraction of MM-containing phases increases with increasing MM contents. All of the extruded alloys exhibit bimodal microstructure comprising fine dynamically recrystallized grains with almost random orientation and coarse deformed grains with strong basal texture. Dense nanosized planar Al_2Ca and spherical Al–Mn phases precipitate inside the deformed grains. High tensile yield strengths of~ 350 MPa and moderate elongations to failure of 12% are obtained in all extruded alloys; the MM substitution induces negligible difference in the tensile properties at ambient temperature, while the highest MM substitution improves the strength at 180 °C due to the better thermal stability of the fragmented MM-containing phases.

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