Interdiffusion of refractory elements in Fe-Cr-X (X-Mo, W) and Fe-Mo-W ternary iron alloys

Abstract

Interdiffusion coefficients of the refractory elements in Fe-Cr-X (X = Mo, W) and Fe-Mo-W ternary alloys were measured on the basis of the modified Boltzmann-Matano method for ternary systems. The cross interdiffusion coefficient, D̃CrWFe was positive in Fe-Cr-W ternary alloy, indicating that W accelerates interdiffusion between Fe and Cr atoms. On the other hand, the cross interdiffusion coefficient, D̃ CrMoFe was negative in Fe-Cr-Mo ternary alloys, indicating that Mo suppresses interdiffusion between Fe and Cr atoms. In addition, the cross interdiffusion coefficient, D̃WMoFe was positive in Fe-Mo-W diffusion system. This result implies that Mo addition accelerates interdiffusion between Fe and W. © 2008 The Japan Institute of Metals.