Theoretical progress in non-equilibrium grain-boundary segregation (II): Micro-mechanism of grain boundary anelastic relaxation and its analytical formula

Article

Abstract

Finding the internal-friction peak of grain boundary anelastic relaxation was one of the important breakthroughs in the study of internal friction in the last century. But the micro-mechanism of grain boundary anelastic relaxations is still obscure. Based on the observations of the grain boundary segregation or depletion of solute induced by an applied stress, the following micro-mechanism was suggested: grain-boundaries will work as sources to emit vacancies when a compressive stress is exerted on them and as sinks to absorb vacancies when a tensile stress is exerted, inducing grain-boundary depletion or segregation of solute, respectively. The equations of vacancy and solute concentrations at grain boundaries were established under the equilibrium of grain-boundary anelastic relaxation. With these the kinetic equations were established for grain boundary segregation and depletion during the grain boundary relaxation progress.

Keywords

grain boundary segregation anelastic relaxation kinetics 

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Copyright information

© Science in China Press and Springer-Verlag GmbH 2009

Authors and Affiliations

  1. 1.Superalloy DepartmentCentral Iron and Steel Research InstituteBeijingChina
  2. 2.Department of Materials Science and Engineering, Shenzhen Graduate SchoolHarbin Institute of TechnologyShenzhenChina

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