Ti-45%Al合金界面形态及微观结构演化的相场模拟

来源期刊：中南大学学报(自然科学版)2006年第5期

论文作者：李新中 苏彦庆 郭景杰 吴士平 傅恒志

文章页码：856 - 861

关键词：Ti-45%Al合金;定向凝固;微观结构;相场;模拟

Key words：Ti-45%Al alloy; directional solidification; microstructure; phase field; simulation

摘    要：用相场法对Ti-45%Al合金在近绝对稳定高速定向凝固条件下的液固相变界面形态和微观结构演化进行模拟。结果表明:初始平界面失稳后形成许多细胞晶,在生长速度进一步增大至近绝对稳定平界面过程中,存在细胞晶向高速平界面的转变;体系溶质分布模拟的研究结果表明,由于固液界面处发生溶质截流,体系出现低微观偏析的凝固结构。模拟结果与快速凝固理论相吻合

Abstract: The phase-field model was used to simulate the evolution of interfacial morphologies and microstructures for Ti-45%Al alloy during directional solidification at high speed close to absolute stability. The simulating results show that the fine cells are formed through the destabilization of the initial planar interface. As the growth velocity increases to the growth rate of absolute stability interface, the interface morphology transforms from fine cells to a high-speed planar interface.The investigation of solute distribution pattern indicates the appearance of microstructure of low microsegregation due to solute trapping at the interface. The simulating results are in good agreement with the theory results of rapid solidification.