AZ61镁合金热压缩流变应力及晶粒尺寸预测

Forecast of Flow Stress and Grain Size of AZ61 Mg Alloy under Hot Compression

摘要:

通过在Gleeble-1500D热模拟试验机上对AZ61镁合金进行热模拟试验，获得等温恒速单轴方向热压缩变形过程的流变应力-应变关系曲线。经过分析和计算曲线的特征值，利用线性和非线性数值回归方法建立峰值应力、峰值应变、再结晶晶粒尺寸等特征值与Zener-Hollomon参数即带温度补偿的应变速率因子Z的定量关系。流变应力的预测计算值与实测值误差在10%以内，晶粒尺寸计算值与实测值误差在5%以内。

Abstract:

The uniaxial isothermal hot compression test of AZ61 magnesium alloy was carried out on Gleeble-1500D thermal-mechanical simulator, the flow stress-strain curves and other information of dynamic recrystallization were investigated by numerical analysis. The relations between Z and other characteristic values of dynamic recrystallization, including peak stress, peak strain and grain size, were developed by regression analysis. The numerical simulation model of flow stress was introduced, its predicted values were proved to be close to the measured values with errors not more than 10%. The errors between predicted values and measured values for grain size were not more than 5%.