Tracer Diffusion of P in Iron and Iron Alloys

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The lattice and grain boundary tracer diffusion coefficients DPL* and PP* of P in bcc iron, Fe–P binary alloys and Fe-0.1 at%P-M (M: Cr, Si, Mn, Mo and Ni) alloys were measured. There was a break in each of the DPL*−1⁄T and PP*−1⁄T lines at temperatures near and below the Curie temperature, respectively. It is considered that the anomalous breaks were caused by magnetic transformation in the bulk and grain boundary. The effects of Cr, Si and Ni on DPL* and PP* were small. Alloying with Mn increased DPL* and PP*, but alloying with Mo decreased them.

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