异步轧制对AZ31镁合金板材组织和性能的影响

对不同轧制温度、道次压下量以及轧制路径等工艺条件下所制备的AZ31镁合金板材的组织和性能进行了研究。结果表明,当温度由623K升到723K时,晶粒发生长大,孪晶消失,板材的抗拉强度由275MPa降到250MPa,伸长率则由14.5%增加到18%;当道次压下量从5%增加到20%时,晶粒逐渐得到细化,板材的抗拉强度由道次压下量为5%时的265MPa增加到20%时的300MPa,伸长率则由18%降到15%;轧制路径的改变,使不同板材中孪晶的数量产生改变,路径A中的孪晶较多,伸长率较低,强度较高,路径D中的孪晶较少,伸长率较高,强度较低。

Influence of Differential Speed Rolling Process on Microstructure and Mechanical Properties of AZ31 Magnesium Alloy Sheet

The microstructure and mechanical properties of AZ31 magnesium alloy sheet produced by differential speed rolling process at the conditions of different rolling temperature, reduction in pass and rolling route were studied. The results show that when the rolling temperature increases from 623 K to 723 K, the grains grow up and twins disappear, and the ultimate tensile strength decreases from 275 MPa to 250 MPa,while the elongation increases from 14.5% to 18%. The ultimate tensile strength increases from 265 MPa to 300 MPa and the elongation decreases from 18% to 15% with increasing reduction in pass from 5% to 20%. The rolling routes affect the quantity of twins in the sheets. Twins in the sheet processed by route A are more than that by other routes, which induces higher ultimate tensile strength and lower elongation. On the other hand, the sheet prepared by route D exhibits higher elongation and lower ultimate tensile strength.