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在AZ31B镁合金板材的板面内沿不同方向进行单向拉伸和压缩试验,研究挤压板材的力学性能。结果表明,变形AZ31B镁合金板材具有显著的各向异性和拉压非对称性。在板面内,沿挤压方向拉伸时的屈服应力明显地比沿同方向压缩和沿其他方向拉伸或压缩时的高(约2倍);沿45°斜向拉伸的屈服应力和抗拉强度较低,而延伸率最高;这种非对称性主要表现为屈服非对称和塑性流动非对称,即拉压的屈服应力不相等和拉压应力-应变曲线形状不同,压缩曲线表现出特殊的“S”型。基于晶体塑性理论,讨论了引起变形镁合金的各向异性和拉压非对称性力学性能的变形机理。
Uniaxial tension and compression tests were conducted in different directions on the surface of AZ31B magnesium alloy sheet to study the mechanical properties of the extruded sheet. The results show that the deformation AZ31B magnesium alloy sheet has significant anisotropy and tension-compression asymmetry. Within the board, the yield stress when stretched in the direction of extrusion is significantly higher (about 2 times) than when compressed in the same direction and when stretched or compressed in the other direction; the yield stress stretched diagonally at 45 ° and The tensile strength is lower and the elongation is the highest. The asymmetry is mainly asymmetric in yielding asymmetry and plastic flow, that is, the yield stress in tension-compression is not equal and the shape in tension-compression stress-strain curve is different. The compression curve shows Special “S” type. Based on the theory of crystal plasticity, the deformation mechanism of the anisotropic and tension-compression asymmetry mechanical properties of the deformed magnesium alloy is discussed.