Al-0.8Mg-1.0Si-0.7Mn合金均匀化热处理工艺

Homogenization treatment of Al-0.8Mg-1.0Si-0.7Mn aluminum alloy

采用光学显微镜、差热分析、扫描电镜、能谱分析,研究了Al-0. 8Mg-1. 0Si-0. 7Mn合金的铸态组织以及铸锭经不同均匀化制度处理后的微观组织。结果表明,试验合金的铸态组织中主要存在Mg2Si相和Al(Fe Mn) Si相,同时存在少量的Al Cu MgSi相和Al Mn相;铸锭过烧温度为589℃;铸锭经560℃保温24 h均匀化处理后,组织中Mg2Si相回溶充分,含Fe相发生了球化,同时在均匀化过程中析出了一种含Mn相。工业化生产条件下,宜采用560℃保温24 h的均匀化处理工艺。

The as-cast microstructure of Al-0.8Mg-1.0Si-0.7Mn alloy and the microstructure of the ingot after different homogenization treatment were studied by optical microscope, differential scanning calorimeter,scanning electron microscope and energy spectrometer. The results showed that Mg 2 Si phase and Al(FeMn)Si phase were mainly presented,with a small number of AlCuMgSi phase and AlMn phase in the as-cast structure of the test alloy. The overheat temperature was 589℃. After homogenization at 560℃ for 24 h,the Mg 2 Si phase was fully redissolved,and the Fe phase was spheroidized,and a Mn phase was precipitated in the homogenization process. Under the industrialized production condition,it is advisable to use the 560℃,24 h homogenization treatment process.