DIFFUSION OF Ni⁶³ IN IRON, COBALT, NICKEL, AND TWO IRON–NICKEL ALLOYS

Abstract

The self-diffusion of nickel and the diffusion of NiG3 into iron, cobalt, and two iro11-nickel alloys was studied using the technique of decrease in surface activity, T l~e nickel selfdiffusion results arc compared to previo~rsly reported values. Nickel is found to diffuse more slowly than iron in the iron-rich portion of the iron-nicltel system. The rate of niclcel diffusion increases with increasing nickel content. . A comparison is made between the present results for diffusion of Nim into iron, cobalt, and niclcel \vith reported values for diffusion of Co60 and Fe" iin the same metals. In each sollent, the magnitudesof theactivation energies, Q, are such that Q N , > Qco > Q F~.

Diffusion in the intermetallic compound NiAl

“…The low energy of nickel-63 makes the isotope most suitable for the residual activity method, the validity of which has been discussed by Mackliet (1958) in connection with his study of nickel diffusion in copper. Although MacEwan et al (1959) employed the surface decrease method with nickel-63 they showed that the radiation from the surface of the Fe-Ni alloys originated from depths no greater than +p. This figure lends weight to the suggestion of Leymonie (1963) that no corrections are necessary for absorption if the layers removed are greater than 2p.…”

Computational Study of Atomic Mobility for fcc Phase of Co-Fe and Co-Ni Binaries

“…2, the calculated Co impurity diffusion in fcc-Ni compares favorably with all available experimental data. [23,25,27,28] The experimental data for the impurity diffusivity of Ni in fcc-Co lie within a narrow band, [23,25,[29][30][31] as shown by the Arrhenius plot of the Ni diffusion in fcc-Co in Fig. 3.…”

“…3) was mainly based on the work of Million and Kucera [31] and a recommended value at 1100°C, supplemented with a compromise made among three measurements. [25,29,30] The recommended value is 1.0 Â 10 -15 (m 2 /s), and was derived from a wide variety of experimental measurements either by extrapolating or eye guide. [30][31][32][33][34][35] The calculated tracer diffusivity of Co in the Co-Ni binary alloys is shown to be dependent on the Ni content in Fig.…”

The Contribution of Multiple Vacancies to Self‐Diffusion

“…MacEwan e t al. [14] t C i.T 3, Prom the thermodynamic relations AY = --and C = €1 -TI9 we obtain r H trivacancies. The mathematical problem is then to find a least square approximation to the measured diffusion coefficients by a function…”

“…= 10, Sy = 0.84 k , and ' ' = 0.6 into(14), we obtain v2, exp S f l k vl0 exp S y / k exp AS2jk = 1 . 7 6 .A.…”