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研究了不同挤压比对AZ31B镁合金显微组织、力学性能的影响。采用光学显微镜观察了显微组织,拉伸试验测试了力学性能,并配合扫描电镜观察了拉伸试样的断口形貌。结果表明:随着挤压比的增加,组织由部分动态再结晶转变为细致的完全动态再结晶,挤压比61~109时,晶粒细化程度变小;挤压比增加,强度及伸长率都增加,抗拉强度、屈服强度及伸长率最高分别达340 MPa、271.5 MPa和21.5%,但高挤压比所获得的性能提高收益小。合金拉伸断口由混合断裂转变为明显韧性断裂。合理控制挤压比可得到良好的综合性能与均匀细致的组织。
The effects of different extrusion ratios on the microstructure and mechanical properties of AZ31B magnesium alloy were studied. The microstructure was observed by optical microscope. The mechanical properties were tested by tensile test. The fracture appearance of the tensile specimen was observed by SEM. The results show that with the increase of the extrusion ratio, the microstructure changes from partial dynamic recrystallization to fine dynamic recrystallization. When the extrusion ratio is from 61 to 109, the grain refinement becomes smaller. The extrusion ratio increases, the strength and elongation The increase rate of elongation, the highest tensile strength, yield strength and elongation of 340 MPa, 271.5 MPa and 21.5%, respectively, but the performance obtained by the high extrusion ratio increased income is small. Tensile fracture alloy transition from mixed fracture to a clear ductile fracture. Reasonable control of extrusion ratio can get a good overall performance and uniform organization.