Theory of vacancy-controlled grain boundary motion
作者： Y. Estrin , K. Lücke
DOI: 10.1016/0001-6160(82)90206-1
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摘要: Abstract The effect of vacancy production/annihilation within a grain boundary (GB) as well that diffusion on motion (GBM) has been theoretically considered. A formalism based discrete description the process developed. treatment permits self-consistent calculation both rate GBM and concentration profile around moving GB. Two complementary models have analyzed in framework this unified way: displacement by direct atomic jumps across GB resulting from boundary. While former case vacancies play secondary role ‘extrinsic’ defects affecting only through their elastic or Coulomb interaction with [mechanism (a)] an increased jump proximity to (a′)], very occurrence latter (b)] is inherently associated operation sinks/sources, thus being governed kinetics. mobility left behind predicted competing analyzed. Qualitative differences these predictions (vacancy enrichment for mechanisms (a) (a′) vs slight deficit mechanism (b): different shapes curves) provide basis experimental identification operative GBM. existing theories critically
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