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 language | English (US) |
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Pages (from-to) | 3467-3476 |
Number of pages | 10 |
Journal | Acta Materialia |
Volume | 46 |
Issue number | 10 |
DOIs | |
State | Published - Jun 12 1998 |
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Polymers and Plastics
- Metals and Alloys