WE43镁合金的均质化处理及本构模型建立

Homogenization treatment and establishment of constitutive model for WE43 magnesium alloy

为了提高WE43镁合金塑性加工性能,对铸态WE43镁合金试样在不同温度(480、500、520、540℃)和保温时间(4、8、12、16h)下进行均质化热处理。并采用金相和X射线衍射分析测试技术,分析均质化处理温度和时间对WE43镁合金组织的影响。结果表明,最佳均质化温度为520℃,保温时间为8h。然后对均质化后的WE43镁合金在热模拟试验机上进行热压缩试验,试验温度为350~475℃,应变速率为0.001~1s^(-1),变形量为60%,获得了WE43镁合金的流变应力-应变曲线,基于流变应力-应变曲线,建立了WE43镁合金的本构模型。

To enhance the plastic processing performance of WE43 magnesium alloy,the as-cast specimens were homogenized at temperature ranging from 480℃C to 540℃C and holding time of 4,8,12 and 16 h,respectively.The effects of the homogenizing temperature and time on the microstructure of the WE43 magnesium alloy were investigated by using metallographic and X-ray diffraction analysis testing techniques.The results show that the optimal homogenizing temperature is 520 ℃ and the holding time is 8 h.Then hot compression test was carred out on the homogenized WE43 magnesium alloy by using a thermal simulation testing machine with deformation temperatures of 350-475 C,strain rates of 0.001-1 s-1 and deformation of 60%,the flow stress-strain curves of the tested alloy are obtained,based on which the constitutive model for WE43 magnesium alloy is established.