Pure titanium has an HCP structure and lacks mechanical properties for many industrial purposes. The BCC phase of Ti is required to make alloys with increased strength compared to pure Ti. Iron is the most potent element for stabilising the BCC phase. However, the addition of Fe to Ti causes segregation issues during solidification, which can be avoided by diffusion-driven solid-state alloying. To predict the diffusion kinetics, the interaction mobility parameters of Ti and Fe in the disordered BCC phase of Ti are necessary. In this work, these parameters are optimised based on new experimental data from Ti-Fe diffusion couples produced by the Field Assisted Sintering Technology (FAST). Diffusion couples were held at 1173K and 1273K for one hour. High-resolution Fe concentration profiles are obtained from Electron Probe Micro Analyser (EPMA). Ternary mobility interaction parameters are assessed based on binary endmembers with a DICTRA sub-module, and results are compared to earlier assessments of mobilities of the disordered BCC TiFe system.

纯钛具有 HCP 结构，缺乏许多工业用途的机械性能。与纯钛相比，需要钛的 BCC 相来制造强度更高的合金。铁是稳定 BCC 相的最有效元素。然而，将 Fe 添加到 Ti 会导致凝固过程中出现偏析问题，这可以通过扩散驱动的固态合金化来避免。为了预测扩散动力学，Ti 的无序 BCC 相中 Ti 和 Fe 的相互作用迁移率参数是必要的。在这项工作中，这些参数根据来自场辅助烧结技术 (FAST) 产生的 Ti-Fe 扩散偶的新实验数据进行了优化。扩散偶在 1173K 和 1273K 下保持一小时。高分辨率 Fe 浓度分布从电子探针微分析仪 (EPMA) 获得。