Abstract
The square root diffusivity matrix [r] and diffusivity matrix [D] have been measured for a Ni-4.0 at. pct Cr-6.3 at. pct Al-3.5 at. pct Mo quaternary alloy at 1100 °C. Using a constant diffusivity analysis, the diffusivities were obtained from three diffusion couples having small initial concentration differences of 5 at. pct or less. When elements of [r] were substituted into the error function solution of the diffusion equation, it was found that the predicted concentration profiles were accurate to within ±0.1 at. pct of measured values. Also, it was found that Mo tends to reduce the diffusion kinetics of Cr and Al in Ni-base alloys. These results suggest that these methods of analyzing diffusion data and predicting interdiffusion data can be applied to alloys containing more than four components.
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Formerly Graduate Student, University of Connecticut.
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Stalker, M.K., Morral, J.E. & Romig, A.D. Application of the square root diffusivity to diffusion in Ni-Cr-Al-Mo alloys. Metall Trans A 23, 3245–3249 (1992). https://doi.org/10.1007/BF02663433
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DOI: https://doi.org/10.1007/BF02663433