Change in the crystallographic structure of grain boundaries in an order-disorder phase transition in Ni3Fe alloy

Abstract

Electron diffraction microscopy and metallography are used to investigate the crystallographic structure of grain boundaries in Ni3Fe alloy with short-range and long-range atomic order. It is found that the fraction of special boundaries in alloys with short-range and long-range order is 0.3–0.4. Heat treatment, which leads to ordering, causes a reorientation of some of the grains with boundaries of a general type, boundary migration, and also faceting of some of the boundaries of general type.