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刘洋,杨光昱,张晓丹,程会民,介万奇.Al-5Mg-2Si-Mn铝合金压铸坯锭SIMA法半固态等温组织演变[J].稀有金属材料与工程(英文),2019,48(9):2972~2980.[Liuyang,Yang Guangyu,Zhang Xiaodan,Cheng Huimin and Jie Wanqi.Semi-Solid Isothermal Heat Treatment Microstructure Evolution of Die-casting Al-5Mg-2Si-Mn Alloy by the SIMA process[J].Rare Metal Materials and Engineering,2019,48(9):2972~2980.]
Semi-Solid Isothermal Heat Treatment Microstructure Evolution of Die-casting Al-5Mg-2Si-Mn Alloy by the SIMA process
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Received:May 15, 2018??Revised:June 12, 2018
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Key words:?Die casting??Gravity casting??Semi-solid forming??Semi-solid isothermal heat treatment microstructure evolution
Foundation item:国家自然科学基金项目(面上项目,重点项目,重大项目),国家重点基础研究发展计划(973计划)
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Liuyang,Yang Guangyu,Zhang Xiaodan,Cheng Huimin and Jie Wanqi??
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Abstract:
??????Semi-solid isothermal heat treatment microstructural evolution of die casting Al-5Mg-2Si-Mn alloy with different injecting pressure was studied. The average α-Al grain size of as-cast die casting experimental alloys was smaller than that of gravity casting, and it decreased while microstructure distortion energy increased with the increase of the injecting pressure. It was found that semi-solid microstructural evolution process of die-casting alloy was similar with, but faster than that of gravity casting. The results from regression analysis show that the relationship between the average α-Al grain diameter and the isothermal holding time fits the formula r ?^3=Kt+〖r ?_0〗^3, and the coarsening rate (K) is decreased with the increase of the injecting pressure. For the fixed injecting pressure, the average α-Al grain size of the experimental alloy increased while the K reduced with the increase of the isothermal holding temperature. For the fixed isothermal holding time, the solid fraction and α-Al grain coarsening rate of die-casting alloy were lower than those of gravity. The appropriate semi-solid isothermal heat treatment parameters of the die casting experimental alloy were determined to be 620 ℃ for 20 min.