Orientation and temperature dependence of the flow stress in the intermetallic compound Ni3Ge single crystals
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Tensile tests on Ni3Ge single crystals were carried out to make clear the mechanism of the positive temperature dependence of the CRSS and the work-hardening rate as a function of the tensile axis orientation below room temperature. Both the CRSS (τ) and the maximum work hardening rate (θ M) show positive temperature dependence even below room temperature. The increments ofτ andθ M are satisfactorily expressed by the Schmid factor ratio of the cube cross slip system to the primary octahedral one,N=(010) [¯101]/(111) [¯101 ]. Then, the positive temperature dependence of both the CRSS and the maximum work-hardening rate is thought to be governed by two mechanisms. One arises from the Kear—Wilsdorf mechanism, which depends on the orientation. The other seems to arise from the orientation-independent factor, although it is obscure at present.
KeywordsCritical Resolve Shear Stress Orientation Dependence Cross Slip Ni3Ga Positive Temperature Dependence
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