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- W2000329191 abstract "Abstract The equilibrium creep rate of oxygen-free high-conductivity copper (99.99%) of constant grain size, subject to constant stress (σ) in vacuo in the range 400–700°C, was found to satisfy the relation e = A 0 (T) exp [ 〈- (H 〉- qσ) kT ] . Two sets of the parameters A0, H and q were however required at given temperature, one below and one above a critical tensile stress σc′(T), above which Cottrell-Lomer locking appeared to become a less effective impediment to slip than at lower stresses. Vacancies travelling along dislocations from grain boundaries to jogs are thought to assist the climb of edge dislocations, which process seems to be rate determining. The activation energies H and H′ (below σc′) are therefore reduced below the value expected for self-diffusion to 32 and 28 kcal/g atom, respectively, which are close to the activation energy for vacancy migration. Cross-slip and polygonization appear to take place in the transient stage of creep. In single crystals H was found to be equal to the activation energy for self-diffusion (49 kcal/g atom) over the same temperature range." @default.
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- W2000329191 date "1959-09-01" @default.
- W2000329191 modified "2023-10-16" @default.
- W2000329191 title "Creep in face-centred cubic metals with special reference to copper" @default.
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- W2000329191 doi "https://doi.org/10.1016/0001-6160(59)90131-2" @default.
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