Tracer Diffusion of P in Iron and Iron Alloys

Abstract

The lattice and grain boundary tracer diffusion coefficients D_PL^* and P_P^* 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 D_PL^*−1⁄T and P_P^*−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 D_PL^* and P_P^* were small. Alloying with Mn increased D_PL^* and P_P^*, but alloying with Mo decreased them.