Abstract
In this work, ternary interdiffusivities in the bcc Ti–rich Ti–Cr–Mn alloys at 1273 K were determined by using the combination of the diffusion couple technique and the Matano–Kirkaldy method. Subsequently, on the basis of the presently obtained interdiffusivities along with the diffusivity and mobility parameters of binary sub–systems within the Ti–Cr–Mn system and thermodynamic descriptions for the bcc Ti–Cr–Mn system, the atomic mobilities of Ti, Cr and Mn in the bcc Ti–Cr–Mn alloys were assessed using the optimization module within the Thermo-Calc software package. Moreover, the comprehensive comparisons between the experimental diffusion properties (i.e., interdiffusivities, composition profiles, and diffusion paths) and the calculated/model–predicted data due to the present atomic mobilities were conducted in order to verify the reliability of the mobilities. At present, the atomic mobilities for the bcc Ti–Cr–Mn system can provide an accurate interdiffusivity matrix over a wide composition range.
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