Mg-14Li-3Al-1 Y-0.8Zr-0.4Sc合金组织及不同轧制变形量对其力学性能的影响

Microstructure of Mg-14Li-3Al-1 Y-0.8Zr-0.4Sc alloy and its mechanical properties under different rolling reductions

镁锂合金材料在航天航空领域具有重要应用价值。探究不同轧制变形量对Mg-14Li-3Al-1 Y-0.8Zr-0.4Sc合金力学性能的影响,为进一步获取质量更轻、力学性能更优的材料研制工艺奠定基础利用光学显微镜(OM)、扫描电子显微镜(SEM)和能谱分析(EDS)表征铸态合金微观组织和第二相类型通过显微维氏硬度计和室温拉伸试验,检测不同轧制变形量的Mg-14Li-3Al-1Y4.8Zr4.4Sc合金的力学性能:研究结果表明:铸态合金包含Al3(Sc,Y,Zr)第二相。在后续的轧制变形中,合金的抗拉强度随着轧制变形量的增加而增加,伸长率随着变形加剧、应变硬化效果增强而减小。轧制变形量为60%的合金表现出最高的硬度和强度,其硬度为77.45 HV,抗拉强度为235 N/mm^(2)。

Magnesium-lithium alloy material has important application value in the aero-space field.The influence of different rolling reductions on the mechanical properties of Mg-14Li-3Al-1 Y-0.8Zr-0.4Sc alloy was explored,which laid a foundation for the further development of the materials with lighter weight and better mechanical properties.Optical microscopy(OM),scanning electron microscopy(SEM),and energy spectroscopy(EDS)were used to characterize the microstructure and second phase of the as-cast alloy.The mechanical properties of Mg-14Li-3Al-1 Y-0.8Zr-0.4Sc alloy under different rolling reductions were tested by micro Vickers hardness tester and room-temperature tensile test.The results show that the as-cast alloy contains the secondary phase of Al3(Sc,Y,Zr).The tensile strength of the Mg-14Li-3 Al-1 Y-0.8Zr-0.4Sc alloy increases with the increasing of rolling reduction,and its elongation decreases with the increasing of deformation and the strain hardening effect.The alloy with a rolling strain of 60%shows the highest hardness and strength,with a hardness of 77.45 HV and a tensile strength of 235 N/mm^(2).