论文部分内容阅读
研究加热温度150~450℃和保温时间对AZ31镁合金晶粒尺寸变化的影响。结果表明:当加热温度一定时,晶粒尺寸随保温时间延长而增加;保温时间一定时,当加热温度在150~250℃范围时,晶粒尺寸随温度升高呈现先增加后减小的趋势。当加热温度大于250℃时,晶粒尺寸随加热温度升高而逐渐增大。基于250~450℃时的实验数据,确定了AZ31镁合金晶粒长大激活能,构建了在等温条件下的AZ31镁合金晶粒长大模型。本文构建的模型计算结果与实验结果吻合较好.
The effects of heating temperature of 150 ~ 450 ℃ and holding time on the grain size change of AZ31 magnesium alloy were studied. The results show that when the heating temperature is constant, the grain size increases with the holding time; when the holding time is fixed, the grain size increases first and then decreases with the increase of temperature when the heating temperature is in the range of 150 ~ 250 ℃ . When the heating temperature is higher than 250 ℃, the grain size increases with the heating temperature. Based on the experimental data at 250-450 ℃, the grain growth activation energy of AZ31 magnesium alloy was determined, and the grain growth model of AZ31 magnesium alloy was constructed under isothermal condition. The model calculated in this paper is in good agreement with the experimental results.