Effect of Sm on Microstructure, Mechanical Property and Lattice Constant of As-Cast Mg–11Gd–2Y–0.6Al Alloy
Effect of Sm on Microstructure, Mechanical Property and Lattice Constant of As-Cast Mg–11Gd–2Y–0.6Al Alloy
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DOI：
10.1007/s12666-019-01650-y
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发表时间：
2019-07
影响因子：
1.6
通讯作者：
Xiaoya Chen;Quanan Li;Limin Zhu;Songbo Wang;Shuai Zhang;Haikun Guan
中科院分区：
文献类型：
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作者：
Xiaoya Chen;Quanan Li;Limin Zhu;Songbo Wang;Shuai Zhang;Haikun Guan
采用气体保护法制备了Mg-11Gd-2Y-xSm-0.6Al （x= 0,1,3,5）合金。采用x射线衍射、金相显微镜、扫描电镜和拉伸试验研究了铸态mg - 11gd - 2y - xsm - 0.6铝合金的晶体组织、显微组织和力学性能。结果表明：Mg-11Gd-2Y-xSm-0.6Al合金的主要相为α-Mg基体、Mg5Gd、mg24y5和Mg41Sm5；Sm的加入细化了组织，增加了晶界第二相的数量。柱面(100)α-Mg、基面(002)α-Mg和圆锥面(101)α-Mgare的衍射峰发生了小角度偏移。α-Mg的衍射峰偏移量和晶格常数随Sm含量的增加而增大。晶轴比随Sm含量的增加而减小。当Sm添加量为3%时，拉伸强度达到240 MPa，提高17.07%。力学性能的改善主要是由于α-Mg的晶粒细化和晶轴比的降低。
Mg–11Gd–2Y–xSm–0.6Al (x= 0, 1, 3, 5) alloys were prepared in electromagnetic induction furnace by gas protection. The crystal structure, microstructure and mechanical properties of as-cast Mg–11Gd–2Y–xSm–0.6Al alloys were studied by X-ray diffraction, metallographic microscope, scanning electron microscopy and tensile testing. The results show that the main phases of Mg–11Gd–2Y–xSm–0.6Al alloys are α-Mg matrix, Mg5Gd, Mg24Y5and Mg41Sm5. The addition of Sm refines the microstructure and increases the number of second phase in the grain boundary. The diffraction peaks of the cylindrical plane (100)α-Mg, base plane (002)α-Mgand conical plane (101)α-Mgare shifted to a low angle. The offset of diffraction peak and the lattice constant of α-Mg increase with the increase in Sm content. The crystal axis ratio decreases with the increase in Sm content. When the addition of Sm is 3%, the ultimate tensile strength reaches to 240 MPa, which increases by 17.07%. The improvement in mechanical properties is mainly attributed to the grain refinement and the decrease in the crystal axis ratio of α-Mg.