Interdiffusion and Order Fracture over Grain Boundaries in the Deformed Ni3Al Intermetallide

Abstract

The peculiarities of diffusion process and changes of long and short order parameters at an elastic and plastic deformation of compression and tension near grain boundaries with disorientation axis <111> are studied by the method of molecular dynamics. Whirl displacements of atoms destroying the order near grain boundary superdislocations are noticed at uniaxial deformation of compression. The fracture of superstructural and structural order at uniaxial deformation is accompanied by the deformation of amorphous area. Interdiffusion mechanism is changed in the dependence on deformation, temperature and boundary types.