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High temperature creep measurements in equiatomic Ni‐Ti shape memory alloy
Author(s) -
Lexcellent C.,
Robinet P.,
Bernardini J.,
Beke D. L.,
Olier P.
Publication year - 2005
Publication title -
materialwissenschaft und werkstofftechnik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.285
H-Index - 38
eISSN - 1521-4052
pISSN - 0933-5137
DOI - 10.1002/mawe.200500922
Subject(s) - creep , activation energy , materials science , thermodynamics , alloy , diffusion , metallurgy , crystallography , chemistry , physics
High temperatures creep rates in equiatomic NiTi alloys at three different stress levels and at different temperatures have been measured. It was obtained that the creep rate can be well described by the Dorn equation with n=3. The activation energy of the effective diffusion coefficient, D c (characterizing the Herring‐Nabarro bulk creep) is Q c = 226 kJmole ‐1 . From comparison of this value with the activation energy of Ni tracer diffusion (155 kJmol ‐1 ) it was concluded that the Ti is the slower component with high diffusion activation energy close to Q c .