Tentative de correlation entre le fluage et la diffusion des solutions solides fortement concentrees [type CuZn(β)]

Towards a Correlation between High-Temperature Creep and Volume Diffusion for Equiatomic NiTi Alloys

“…Ni between 103 K and 1073 K. They obtained that G increases with temperature between 273 K and 773 K from 19.8 GPa to 25.7 GPa and, decreases between 773 K and 1073 K from 25.7 GPa to 20.6 GPa. The thermodynamic of irreversible process used for binary solid solution allows to write some possible diffusion coefficients [7]. If N L and D L are the vacancies concentration and their diffusion coefficients respectively,…”

“…Obviously, the high temperature creep is associated with vacancy diffusion or movement of atoms A and B during alloy deformation. In 1989, Lexcellent [7] has done a tentative of correlation between diffusion and creep for high concentrated solid solutions type AB. On the one hand, he investigated five β phases (Ag-50 at.% Cd, Ag-50 at.% Zn, Cu-25 at.% Al, Cu-14,4 at.% Sn and Cu-42.7 to 52 at.% Zn) by creep tests over temperature ranges higher than 0.6 T m (T m , melting temperature).…”