Change in grain-boundary ensemble upon the A1 → L12 phase transition in Ni3Mn alloy
The grain structure of Ni3Mn alloy is investigated in the states with short-range and long-range atomic orders that arise at the A1 → L12 phase transition. It is found that in ordering annealing, new boundaries of a general type form, the fraction of special-type boundaries (including twin boundaries) is reduced, the share of high-energy special boundaries with Σ > 11 increases, and the alloy’s texture is transformed into a “gray” texture.