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OALib Journal期刊
ISSN: 2333-9721
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用相场方法模拟fe--c合金枝晶生长
Keywords: 材料科学基础学科,枝晶生长,相场法,fe--c合金,过冷度
Abstract:
？采用相场法模拟了fe--0.5%c合金等温凝固过程中单个枝晶和多个枝晶的生长,研究了过冷度、各向异性、界面厚度、晶体取向以及扰动对枝晶形貌的影响,获得了具有二次分枝的枝晶形貌,再现了枝晶生长过程及枝晶臂之间的竞争生长.模拟结果表明:凝固过程中存在溶质富集和枝晶偏析,枝晶主干溶质浓度最低,枝晶臂之间的液相浓度最高.随着过冷度的增大,枝晶生长加快且分枝发达;界面厚度直接影响枝晶的生长速度;各向异性影响枝晶的形态;晶体取向与坐标轴方向一致时枝晶优先生长；扰动的加入导致枝晶分枝的形成.
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