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–6Al–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 β phase. Statistics of plate width, thickness and inter–platelet β 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 β phase near α/β 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.
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