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- W2000983457 abstract "The work of Burton, Crossland, Jones and others on the creep of polycrystalline metals, of grain size about 10 – 100 μm, at intermediate temperatures (about (0.4 – 0.6)Tm) and low stresses ((10−5 - 10−4)E), is reviewed. These investigators suggest that such materials will deform by diffusional (Coble) creep accompanied by a threshold stress below which creep will not occur. Jones' observations that the creep rates of such metals are generally faster than those predicted by Coble creep and that the observed threshold stresses are unpredictably high has led us to consider alternative mechanisms for plastic flow. Our analyses indicate that the creep of such materials follows a relation of the form ϵ̇ ∝ Dgb δ2/d3, with no threshold stres, in agreement with the relation developed for describing fine-grained two-phase superplastic alloys. These correlations suggest that grain boundary sliding accommodated by slip is the principal mechanism of plastic flow. It is shown that diffusional creep (Coble) and grain boundary sliding accommodated by diffusional creep (Ashby-Verrall) are mechanisms which are not likely to contribute to plastic flow at stresses above 10−5E." @default.
- W2000983457 created "2016-06-24" @default.
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- W2000983457 date "1982-11-01" @default.
- W2000983457 modified "2023-09-25" @default.
- W2000983457 title "Low stress creep of fine-grained materials at intermediate temperatures: Diffusional creep or grain boundary sliding?" @default.
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- W2000983457 doi "https://doi.org/10.1016/0025-5416(82)90169-0" @default.
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