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通过光学显微镜(OM),X射线衍射(XRD),扫描电子显微镜(SEM),电子背散射衍射(EBSD)以及拉伸试验对360和420℃挤压的Mg-6Zn-1Mn-4Sn-0.5Y变形镁合金的组织和性能进行了研究。结果表明,合金铸态和时效态的相组成为α-Mg,Mn,Mg_7Zn_3,Mg_2Sn,和MgSnY相。挤压温度从360℃增加到420℃,动态再结晶完成,晶粒长大,合金的屈服强度、抗拉强度以及延伸率分别由259 MPa,350 MPa和18.3%降低至239 MPa,332 MPa和12.5%。理论计算和拉伸试验结果表明,细晶强化和固溶强化对合金屈服强度的增加产生决定性影响。
The microstructures of Mg-6Zn-1Mn-4Sn-0.5Y alloy extruded at 360 and 420 ℃ were characterized by OM, XRD, SEM, EBSD and tensile test. The microstructure and properties of deformed magnesium alloy were studied. The results show that the phase compositions of as-cast and aged alloys are α-Mg, Mn, Mg_7Zn_3, Mg_2Sn and MgSnY phases. The extrusion temperature increased from 360 ℃ to 420 ℃. The dynamic recrystallization was completed and the grains grew up. The yield strength, tensile strength and elongation of the alloy decreased from 259 MPa, 350 MPa and 18.3% to 239 MPa and 332 MPa, respectively 12.5%. The theoretical calculation and tensile test results show that the fine grain strengthening and solid solution strengthening have a decisive influence on the yield strength of the alloy.