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- W42249654 abstract "It is well-established that the segregation of solute elements, either individually or in combination, may promote intergranular embrittlement in a wide range of metal alloy systems. In this paper, the nature of the solute segregation and its influence on the macroscopic mechanical properties are reviewed followed by a discussion of the micromechanisms of the embrittlement. A model for the grain boundary embrittlement by solute segregation is proposed which allows plastic flow ahead of a pre-existing crack prior to its eventual propagation in a brittle mode. The model considers the competition between the reduction in the crack tip tensile stress by plastic blunting and the modification of the stress field ahead of the crack tip by dislocation emission, which increases this stress. A reduction in the cohesive strength changes the balance in favour of brittle crack propagation. This is illustrated by recent quantitative measurements of the grain boundary fracture strength in molybdenum which provides direct evidence that oxygen segregated at boundaries results in small but significant reductions in the boundary strength thereby promoting intergranular fracture. Recent results from studies of interatomic bonding at free surfaces provide a basis for understanding how impurity segregation may reduce the grain boundary cohesive strength, and these results are briefly reviewed." @default.
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- W42249654 date "1981-01-01" @default.
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- W42249654 title "SOLUTE EFFECTS ON INTERGRANULAR FRACTURE" @default.
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- W42249654 doi "https://doi.org/10.1016/b978-0-08-026724-1.50008-x" @default.
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