Accession Number : AD0259447

Title :   SELF-DIFFUSION IN DELTA IRON

Corporate Author : DELAWARE UNIV NEWARK

Personal Author(s) : STAFFANSSON,LARS I. ; BIRCHENALL,C. ERNEST

Report Date : 09 APR 1961

Pagination or Media Count : 21

Abstract : Self-diffusion of Fe was measured in delta Fe between 1404 and 1518 C. Although the delta Fe results are adequately described by the equation D equals 0.019 exp (-42400/RT) sq cm per sec, in order to join these coefficients in a reasonable way with the self-diffusion coefficients of alpha Fe, it is necessary to introduce a curved line in the plot of logarithm of diffusivity versus reciprocal of absolute temperature. Although this curved line diminishes the magnitude of the Curie point anomalies observed for self-diffusion in alpha Fe and probably for diffusion in Fe-V alloys, it does not appear that the excess vacancy formation energy arising from spin ordering is enough to account for the whole Curie point effect. Possible ways to obtain information about changes in the activation energy for vacancy motion are discussed. (Author)

Descriptors :   *DIFFUSION, *IRON, IRON ALLOYS, MEASUREMENT, PHASE STUDIES, TRACER STUDIES, TRANSITION TEMPERATURE, VANADIUM ALLOYS

Distribution Statement : APPROVED FOR PUBLIC RELEASE