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研究了ZM21镁合金热挤压板坯及其经过不同累积变形量的横轧和纵轧后板材组织和力学性能的各向异性,力学性能检测包含与板坯挤压方向分别呈0°、45°、90°的方向。结果表明:与挤压态相比较,横轧和纵轧后轧制态合金的强度更高而塑性更低;随着轧制变形量的增加,强度增大,塑性下降。经过挤压-轧制后,原挤压板坯宽度方向抗拉强度最好,原挤压方向最差;伸长率以45°方向为最好,原挤压方向伸长率最差,仅横轧变形量为31.0%时例外,原挤压方向伸长率高达22%。轧后板材伸长率的各向差异受轧制方向的影响比强度更显著,总体上横轧有利于各向异性的控制,其中当横轧变形量为44.8%时,伸长率和抗拉强度的各向异性达到最优组合,各向异性指数IPA分别为7.58%和3.16%。
The anisotropy of the microstructure and mechanical properties of ZM21 magnesium alloy hot extrusion slabs and their cross-rolled and longitudinally-rolled plates after different cumulative deformations were investigated. The mechanical properties of ZM21 magnesium alloy including 0 and 45 °, 90 ° direction. The results show that compared with the extruded state, the strength of the as-rolled alloy is higher and the plasticity is lower. As the amount of rolling deformation increases, the strength increases and the plasticity decreases. After the extrusion - rolling, the original tensile strength of the best slab width direction, the original extrusion direction of the worst; elongation at 45 ° direction is the best, the original direction of the worst extrusion elongation, only Except for the 31.0% roll deformation, the original extrusion direction elongation up to 22%. After rolling, the anisotropy of sheet elongation was significantly affected by the direction of rolling. The overall transverse rolling was favorable for the control of anisotropy. When the amount of transverse rolling deformation was 44.8%, the elongation and tensile strength The anisotropy of strength achieves the best combination with an anisotropy index of IPA of 7.58% and 3.16%, respectively.