终轧工艺对AM50镁合金轧板力学性能和织构特征的影响

摘要

The conventional hot rolling of AM50 alloy at different roll temperatures and speeds was performed to investigate the effects of finish-rolling conditions on the mechanical properties and texture of rolled sheet. The better combination between strength (ultimate tensile strength:295 MPa;yield strength:224 MPa) and ductility (22.9%) can be obtained for the AM50 sheet rolled at the roll temperature of 200 °C with the roll speed of 5 m/min. The yield stress depends strongly on roll temperature, while the texture intensity in rolled sheets is more sensitive to roll speed during hot rolling. Increasing rolling temperature or roll speed can improve the mechanical anisotropy of AM50 rolled sheets.%采用不同的轧辊温度和速率制备AM50镁合金轧板，研究终轧工艺对镁板力学性能和织构特征的影响。研究表明：在轧辊温度为200°C和轧辊速率为5 m/min条件下制备的镁板的强度(极限抗拉强度：295 MPa；屈服强度：224 MPa)和伸长率(22.9%)之间达到较优组合；在热轧过程中，轧板的屈服强度主要取决于轧制温度，而织构强度则对轧辊速率更为敏感；提高轧制温度或轧辊速率均可改善AM50镁合金板材力学性能的各性异性。