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,2019,48(9):2972~2980.[Liuyang,Yang Guangyu,Zhang Xiaodan,Cheng Huimin,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.]
Al-5Mg-2Si-Mn铝合金压铸坯锭SIMA法半固态等温组织演变
投稿时间:2018-05-15??修订日期:2018-06-12
中文关键词:??压力铸造??重力铸造??半固态成型??半固态等温组织演变
基金项目: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)
中文摘要:
??????研究了不同压铸条件下Al-5Mg-2Si-Mn铝合金压铸坯锭的等温半固态组织演变过程。与重力铸造相比,铸态压铸实验合金的α-Al初始晶粒尺寸细小;且压射压力越大,晶粒尺寸越小,组织中的畸变能越多。研究表明,重力铸造与压铸实验合金的半固态等温组织演变过程相似,但压铸合金的演变进程更快。不同压射压力压铸实验合金坯锭的半固态等温热处理过程中,α-Al晶粒直径与等温时间之间符合关系式 r ?^3=Kt+〖r ?_0〗^3,粗化速率常数 K 随压射压力的增大而减小。对于相同压射压力的压铸合金坯锭,随等温温度的升高,半固态组织的α-Al的晶粒尺寸增大,粗化速率常数 K 减小。在相同等温时间条件下,压铸合金比重力铸造合金等温半固态组织的固相体积分数小,晶粒的粗化速率低。研究确定了实验合金的优化半固态等温处理工艺为620 ℃等温20 min。
Semi-Solid Isothermal Heat Treatment Microstructure Evolution of Die-casting Al-5Mg-2Si-Mn Alloy by the SIMA process
英文关键词:Die casting??Gravity casting??Semi-solid forming??Semi-solid isothermal heat treatment microstructure evolution
英文摘要:
??????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.
作者单位E-mail
刘洋?西北工业大学?SatinnaNPU@163.com?
杨光昱?西北工业大学材料学院?ygy@nwpu.edu.cn?
张晓丹?西北工业大学材料学院??
程会民?西安北方光电科技防务有限公司??
介万奇?西北工业大学材料学院??
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