Abstract
It is shown that measurements of the rate of grain boundary sliding using internal friction can be used for calculating an upper bound in strain-rate, above which wedge type of intergranular fracture will not occur. A transition in mode of fracture, from ductile-transgranular at high strain-rate to wedge-intergranular at a lower strain-rate, in Ni is adequately predicted by internal friction measurements. At a still lower strain-rate, a shift from wedge type to “r” type of intergranular fracture occurs. This transition apparently agrees well with the change in the overall creep mechanism from power-law creep to diffusional creep.
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C. GANDHI, formerly Research Associate, Department of Materials Science and Engineering, Cornell University, Ithaca, NY.
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Gandhi, C., Raj, R. An upper bound on strain rate for wedge type fracture in nickel during creep. Metall Trans A 12, 515–520 (1981). https://doi.org/10.1007/BF02648550
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DOI: https://doi.org/10.1007/BF02648550