研究了Al Mg Si合金在液固两相区之间不同加热温度、不同保温时间对力学性能的影响 ,结果表明 ,在同一保温时间下合金的力学性能随着加热温度的升高抗压强度和屈服强度会有一定的提高 ,而在等温下随着保温时间的增加力学性能先略有提高随后快速下降 ,原因是保温时间会使晶粒的尺寸先细化然后又逐渐长大 ,使得晶粒间的结合程度减小。通过分析不同温度、不同保温时间的材料显微组织 ,找出达到合金最佳性能的工艺方案 The effects of different heating temperature and different holding time on the mechanical properties of Al Mg Si alloy were studied. The results show that the mechanical properties of Al Mg Si alloy with increasing heating temperature and compressive strength Yield strength will be increased to a certain extent, but with the increase of holding time, the mechanical properties increase slightly and then drop rapidly at the same temperature. The reason is that the holding time will make the grain size refine and then grow gradually, The degree of binding decreases. Through the analysis of different temperature, different holding time of the material microstructure to find the best performance of the alloy process options