Abstract
The thin layer sectioning technique has been used in order to determine the solute diffusivity of 59Fe tracers in the light rare-earth metals cerium, praseodymium and neodymium. The measurements were made both in the close-packed (f.c.c. for Ce and double-h.c.p. for Pr and Nd) and in the high-temperature b.c.c. phases of the solvent metals. The diffusivities of iron are extremely high, with values exceeding 10-5 cm2/sec at temperatures above 0.7 Tm (Tm melting temperature of the solvent metal). The activation energies are much lower than the activation energy for self-diffusion, of the order of 10 kcal/mole. The results indicate that iron is a fastdiffusing solute, its diffusion in the rare-earth metals taking place probably by means of the dissociative mechanism, with a predominantly interstitial component. Several simultaneous measurements of the diffusivity of 54Mn suggest that Mn is also a fast-diffusing solute, though to a lesser extent than 59Fe.
Original language | English |
---|---|
Pages (from-to) | 473-479 |
Number of pages | 7 |
Journal | Acta Metallurgica |
Volume | 23 |
Issue number | 4 |
DOIs | |
State | Published - 1 Jan 1975 |
Externally published | Yes |
ASJC Scopus subject areas
- General Engineering