摘要
采用相场方法定量模拟了界面能各向异性对Ti-6Al-4V合金片层α相生长的影响.模拟所需的动力学与热力学数据分别来自DICTRA和Thermo-Calc数据库.结果表明,在高温热处理条件下,界面能各向异性是控制α相形貌的重要因素.温度越高α相沿长度方向生长越慢,片层的宽度和厚度越大.定量研究了新生α相和残余β相的宽度和厚度随模拟条件的变化,统计结果表明,对应于不同的界面能各向异性,α相的宽厚比演化规律不同,界面能各向异性越强,生成的α相越宽,残余β相宽度也越大.溶质场分析表明,生长过程中溶质分布不均匀,在相界β侧形成了Al贫瘠区和V富集区,且界面能各向异性越强,溶质场不均匀越明显.
The effect of interface energy anisotropy on the sideplate growth in Ti-6A1-4V is studied using 3D quantitative phase field method.The dynamic and thermodynamic data come from the DICTRA and Thermo-Calc databases,respectively.The results show that the interface anisotropy is an important factor controlling the shape of plates.Larger interface energy anisotropy results in wider plates and thicker residual /3 phase.Statistics of plate width,thickness and inter-platelet /？ phase thickness show that the evolutions of the width to thickness ratio of sideplate are different for systems with different interface energy anisotropy ratios.Solute concentrations are found inhomogeneous in the /？ phase near a/0 interface（Al-poor and V-rich）.The stronger the interface energy anisotropy is,the greater of the inhomogeneity.Higher temperatures result in slower growth,forming wider and thicker plates.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2012年第2期148-158,共11页
Acta Metallurgica Sinica
基金
国家重点基础研究发展计划项目2011CB606404
中国科学院信息化建设专项项目INFO-115-B01资助~~
