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以LZ92镁锂合金为研究对象,采用Deform-3D软件对其正挤压变形方式进行数值模拟。研究了不同挤压比(分别为10,20和30)对等效应力和等效应变的影响。结合正挤压变形的分析结果进行热挤压实验,对变形后的试样进行显微组织观察和力学性能测试。结果表明:随着挤压比的增大,试样的等效应变增大,均匀性增强,等效应变以0.5的增长速度线性增长,最大等效应变高达3;LZ92镁锂合金再结晶越充分,晶粒细化越明显,晶粒尺寸由45μm细化至约15μm。LZ92变形镁锂合金具有优异的力学性能,随着挤压比的增大,屈服强度、抗拉强度和变形量显著提升,抗拉强度逐渐增大至203.1 MPa,较铸态提高了76%,屈服强度以40 MPa的增长速度线性增长。
Taking LZ92 Mg-Li alloy as the research object, Deform-3D software was used to simulate the deformation mode of its positive extrusion. The effects of different extrusion ratios (10, 20 and 30, respectively) on equivalent stress and equivalent strain were investigated. According to the results of the analysis of positive extrusion deformation, the hot extrusion test was carried out, the microstructure of the deformed sample was observed and the mechanical properties were tested. The results show that with the increase of extrusion ratio, the equivalent strain increases and the uniformity increases. The equivalent strain increases linearly with the growth rate of 0.5, and the maximum equivalent strain reaches as high as 3. The recrystallization of LZ92 magnesium-lithium alloy Full, the more obvious the grain refinement, grain size refinement from 45μm to about 15μm. LZ92 deformed magnesium lithium alloy has excellent mechanical properties. As the extrusion ratio increases, the yield strength, tensile strength and deformation increase significantly, the tensile strength increases to 203.1 MPa, which is 76% higher than that of as-cast, Yield strength increases linearly at a rate of 40 MPa.