Self-diffusion of60Co and72Ga in the ordered electronic compound CoGa

Constitutional and thermal point defects inB2NiAl

“…[88][89][90][91] Their formation and interaction energies are therefore valuable for understanding the kinetic processes in NiAl.…”

Analysis of isochronal calorimetric measurements of point defect elimination in a quenched Co48Ga52intermetallic compound

“…This correlation between the sum of formation and migration enthalpy of vacancies and the activation energy of self-diffusion is largely an open question (Bose, Frohberg and Wever 1979). Only the use of lattice-site-specific microscopic methods, such as y-y angular correlation, Mossbauer or positron lifetime spectroscopies, might determine these atomistic quantities accurately.…”

“…Since the annealing is thermally activated, the g(7') rate function of such a process may be expressed in the form of the Arrhenius relation g(T)=k,exp -2 ( RET)T where k, is the frequency factor, E, is the activation energy, R is the perfect gas constant and Tis the absolute temperature. This point is controversial and numerous papers have appeared on this topic (for example Brown (1988) and Chen and Spaepen (1991)).…”

“…Coats and Redfern (1965) have given an approximate expression to calculate the integral I which is a function of T and E,:…”

Diffusion mobilities for the B2-b.c.c. phase in the Ni–Al binary system

“…A quantitative knowledge of diffusivities is also attractive when predicting the lifetime of NiAl coating. It is generally much more complex than that of disordered solid solution [3,4]. The quantitative models of diffusivities are essential to perform a simulation of the diffusion-controlled phase transformations.…”