Tracer Diffusion in Nonstoichiometric Intermetallic Compounds with Random Mixing on Each Sublattice |
| Journal |
Defect and Diffusion Forum (Volumes 247 - 248) |
| Volume |
Defects and Diffusion in Metals - An Annual Retrospective VIII - |
| Edited by |
David J. Fisher |
| Pages |
21-28 |
| DOI |
10.4028/www.scientific.net/DDF.247-248.21 |
| Online since |
December, 2005 |
| Authors |
I.S. Sandhu,
D.K. Chaturvedi,
Irina V. Belova,
Graeme E. Murch
|
| Keywords |
Correlation Factors, Intermetallic, Ordered Alloys, Tracer Diffusion |
| Abstract |
Tracer di f fusion by way of vacancies is invest igated in B2 intermetal l ics
AB by means of a kinet ic equat ion approach. The model used is one wi th four inter
sub-lat t ice frequencies where each sub-lat t ice is t reated as a random al loy.
Coupl ing is achieved between the two types of cycles, i .e. , wi th the vacancy
start ing on one sub- lat t ice and finishing on ei ther sub-lat t ice and wi th a vacancy
start ing on the other sub-lat t ice and finishing on ei ther sub-lat t ice. An expression
for the t racer cor relat ion factor is derived in terms of atom vacancy exchange
frequencies and atomic concentrat ions. Resul ts from this expression are compared
wi th Monte Car lo calculat ions and also resul ts f rom a previous Manning-type
random al loy approach to the problem. |
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