Abstract
For the γ peak [the kink pair formation (KPF) on screw dislocations] in high-purity Nb, the stress (σ) dependence of the activation enthalpy (HKPF) and the pre-exponential factor (ν0) of the reciprocal of the relaxation time was investigated using anelastic creep. HKPF at σ = 0, i.e. 2Hk (Hk = the enthalpy of an isolated single kink), was found as 0.63 ± 0.02 eV with log[ν0 (s−1)] = 13.6±0.5. ν0 decreased with increasing σ as well as HKPF, by about two orders at σ ≒ 16 MPa: When 1n[ν0(σ)/ν0(σ = 0)] is plotted against (2Hk − HKPF/2Hk(∝(σ/σP)12 with σP = the Peierls stress), a good similarity can be found between the present result in Nb and the result reported in Fe. We surmise that the decrease in ν0 with increasing σ is mainly associated with a change in the entropy factor associated with KPF.
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