Abstract
The effect of grain boundary precipitation on the stability of extrinsic grain boundary dislocations (EGBD) was studied in alloys in which the occurence of depletion of definite alloy elements in grain boundary region is well documented, namely Cr-Ni-austenitic steel and Al-Zn-Mg alloy. It was found that depletion of grain boundaries of alloying elements that occurs in the process of precipitation on grain boundaries results in substantial decrease of EGBDs stability. Results are interpreted in terms of changes in grain-boundary diffusion coefficients.
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