Grain-boundary segregation in Al-10%Mg alloys at hot working temperatures

X. Y. Liu, James Adams

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81 Scopus citations

Abstract

Monte-Carlo simulations are done to determine Mg enrichment at various grain-boundaries of Al-10%Mg alloys at hot working temperatures. The interatomic potentials used in the simulations are developed using the force-matching method. The Mg segregation levels at the grain-boundaries are found to vary from 20% to 40%. The segregation enrichment differences at different grain-boundary sites are explained in terms of atomic size and local hydrostatic stress. The segregation level varies strongly with [110] tilt boundaries from low to high angle while showing minimal variation with [100] twist boundaries. Segregation levels are found to have some correlation with grain-boundary energy. The effect on grain-boundary decohesion due to Mg segregation is found to be a modest (10-35%) reduction in fracture energy compared to the fracture energy in pure Al.

Original languageEnglish (US)
Pages (from-to)3467-3476
Number of pages10
JournalActa Materialia
Volume46
Issue number10
DOIs
StatePublished - Jun 12 1998

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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