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研究了Mg-5wt%Zn-1wt%Y合金在热挤压和热轧两种变形过程中组织及性能的变化。结果表明,两种变形工艺均能细化合金组织,提高合金性能。热轧后合金获得了20~30μm均匀的晶粒和少量孪晶,合金的抗拉强度为291.4 MPa,断后伸长率为10.9%;而经过热挤压后的再结晶晶粒尺寸可达2μm,有部分未再结晶区域存在,合金的抗拉强度可达368.8 MPa,断后伸长率为13.4%。较高的强度源于极其细小的再结晶晶粒及弥散分布的第二相。
The microstructure and properties of Mg-5wt% Zn-1wt% Y alloy during hot-extrusion and hot-rolling deformation were studied. The results show that the two deformation processes can refine the alloy structure and improve the performance of the alloy. The hot-rolled alloy obtained 20 ~ 30μm uniform grains and few twins. The tensile strength of the alloy was 291.4 MPa and the elongation after fracture was 10.9%. The recrystallized grain size after hot extrusion was up to 2μm , Some non-recrystallized region exist, the tensile strength of the alloy up to 368.8 MPa, elongation after fracture of 13.4%. The higher strength results from the extremely fine recrystallized grains and the dispersed second phase.