【摘要】 通过弯曲矫直工艺在较大尺寸的ZK60镁合金板材中成功预置大体积分数的拉伸孪晶，研究了在200℃沿RD(轧向)和TD(横向)方向弯曲矫直对板材组织及力学性能的影响。结果表明，不同弯曲矫直方向下ZK60镁合金板材的组织和性能不同。沿RD方向进行弯曲矫直时产生的拉伸孪晶数量要高于沿TD方向弯曲矫直时产生的；在沿RD方向进行拉伸时，沿RD方向进行弯曲矫直的试样屈服强度降低，抗拉强度升高，而沿TD方向进行弯曲矫直的试样屈服强度会大幅升高，抗拉强度略有升高。在沿TD方向进行拉伸时，沿TD或者RD方向进行弯曲矫直的试样屈服强度和抗拉强度都会提高。经过弯曲矫直之后的应变硬化指数(n值)有所提高，塑性应变比(r值)大幅下降，有利于改善镁合金板材的塑性成形性能。更多还原

【Abstract】 Large volume fraction of tensile twins were preset in ZK60 magnesium alloy sheet by corrugated wide limit alignment. The effects of deformation path along RD(rolling direction) and TD(transverse direction) at 200 ℃ on the microstructure and mechanical properties of the sheet were studied. The results show that the microstructure and properties of the ZK60 magnesium alloy sheet are different under different deformation paths. When deformed along RD direction, the volume fraction of tensile twins is higher than that deformed along the TD direction. When the tensile test is carried out along the RD direction, the yield strength of the sample deformed along the RD direction decreases and the tensile strength increases, while the yield strength of the sample deformed along the TD direction increases significantly and the tensile strength increases slightly. When the tensile test is carried out along the TD direction, all the yield strength and tensile strength of the sample deformed along the RD and TD direction increase. After the corrugated wide limit alignment, the strain-hardening exponent(n value) increases and the plastic strain ratio(r value) decreases significantly, which is beneficial to effectively improve the plastic forming performance of magnesium alloy sheet.更多还原