摘要
Hot compression behavior of Al6061/Al2O3nanocomposite was investigated in the temperature range of350-500°C andthe strain rate range of0.0005-0.5s-1,in order to determine the optimum conditions for the hot workability of nanocomposite.Theactivation energy of285kJ/mol for the hot compression test is obtained by using hyperbolic sine function.By means of dynamicmaterial model(DMM)and the corresponding processing map,safe zone for the hot workability of AA6061/Al2O3is recognized attemperature of450°C and strain rate of0.0005s-1and at temperature of500°C and the strain rate range of0.0005-0.5s-1,with themaximum power dissipation efficiency of38%.Elongated and kinked grains are observed at400°C and strain rate of0.5s-1due tothe severe deformation.
为确定热加工性能的最佳条件,在温度350~500°C、应变率0.0005~0.5 s^(-1)下研究Al6061/Al_2O_3纳米复合材料的热压缩行为。采用双曲正弦函数得到材料热压缩测试活化能为285 kJ/mol。用动态材料模型和相应的加工图,确定了温度450°C、应变速率0.0005 s^(-1)和温度500°C、应变速率0.0005~0.5 s^(-1)为Al6061/Al_2O_3材料的热加工性能安全区,最大功率损耗率为38%。由于材料大变形,在温度400°C和应变速率0.5 s^(-1)下得到了被伸长和扭结晶粒。
