Al-4.8Mg合金热变形后的静态软化行为研究

Study on Static Softening Behavior of Al-4.8Mg Aluminum Alloy after Hot Deformation

摘要: 本文采用Gleeble热压缩模拟试验与金相检测，研究了Al-4.8Mg合金热变形后的静态软化行为。研究结果表明：Al-4.8Mg合金双道次热压缩过程中，材料经过第一道次热压缩及道次间停留后，第二道次流变应力相比第一道次呈现出阶梯状下降特征；提高第一道次的变形温度、应变速率、应变量及延长道次间隔时间，均可提升道次间静态再结晶程度，促进道次间的静态软化。根据实验结果建立了Al-4.8Mg合金的静态再结晶动力学方程，方程计算值与试验值的平均相对误差仅为3.8%。

Abstract: The static softening behavior of Al-4.8Mg alloy was examined after hot deformation using Gleeble thermal simulation experiment and metallography experiment in this work. Compared with the flow stress of Al-4.8Mg alloy in the first pass during the process of double pass hot compression, the flow stress of Al-4.8Mg alloy in the second pass was shown a step-like decline after the first pass hot compression and stop in the second pass. The static recrystallization degree between passes can be improved by increasing the deformation temperature, strain rate and strain variable of the first pass and extending the interval time between passes, thus promoting the static softening between passes. According to the experimental results, the static recrystallization kinetics equation of Al-4.8Mg alloy was established, and the average relative error was only 3.8% between the calculat-ed values and the experimental values.