Abstract
LIGHTLY stressed polycrystalline metals may deform by the vacancy diffusion mechanism proposed by Nabarro1 and Herring2. At high temperatures, ∼0.8 of the absolute melting temperature Tm, lattice self-diffusion is rapid and an appreciable diffusion creep may take place at a rate (ε̇) given by2: where B1 is a constant, ∼ 10 for equiaxed polycrystals; Ω the atomic volume of the material; σ the small applied stress; Dl the lattice self- diffusion coefficient; d the mean grain diameter; and kT has the usual meaning.
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References
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JONES, R. Diffusion Creep in Polycrystalline Magnesium. Nature 207, 70 (1965). https://doi.org/10.1038/207070a0
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DOI: https://doi.org/10.1038/207070a0
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