抄録
The lattice diffusion and the grain boundary diffusion of copper in γ-iron were measured in the temperature range from 1105 to 1210°C by the residual activity method with radio-active tracer 64Cu. The experimental penetration profiles were analysed by the instantaneous source model of grain boundary diffusion proposed by Suzuoka. The temperature dependence of the lattice diffusion coefficient Dl and the grain boundary diffusion coefficient Dgb are expressed by the following equations:
Dl=4.16×10−4exp(−305.0kJ·mol−1⁄RT)m2s−1
Dgb·δ=4.27×10−13exp(−167.8kJ·mol−1⁄RT)m3s−1.
