铝合金半固态成形件固溶热处理工艺优化的研究

Study on Optimizing the Technology of the Solution Treatment for SSM Products of Aluminum Alloy

研究了ZAlSi7MgA合金半固态压铸成形件在不同固溶热处理工艺下的力学性能与微观组织。试验得出:在相同的保温时间下,随着固溶温度的不断提高,合金的硬度逐渐下降,当温度升到400℃后,随着固溶温度的升高,基体组织的固溶度不断增大,硬度持续上升;在540℃固溶温度下,保温不同的时间,合金硬度呈现一定的曲线关系,并出现一个硬度峰,与之对应的保温时间大约为2h。从微观角度解释了不同固溶热处理工艺产生这一性能差异的内在原因。

First, the mechanical properties and microstructure of the product of ZAlSi7MgA Aluminum alloy through semisolid casting under the different solution treatment technologies have been studied in the paper. It is shown that for the same holding time, when the solution temperature increases gradually ,the hardness will decrease step by step; when the solution temperature reach about 400℃,the hardness will increase gradually as the solution temperature increases. It is also shown that for the same solution temperature(540℃),when the holding time is different ,the hardness will have a relation as a function of the holding time. Among the curve, there is a peak, and the holding time for the peak is about 2h. Meanwhile the mechanism of the difference of mechanical properties in solution heat treatment has also discussed.