Texture evolution during recrystallization in a boron-doped Ni76Al24 alloy

Abstract

The evolution of recrystallization texture in the intermetallic compound Ni76Al24(B) has been investigated using the conventional pole figure as well as orientation distribution function (ODF) methods. The initial L12 structure which transforms to DO22 on cold rolling reverts back to the L12 during annealing. The annealing process can be divided into three stages: recovery, reordering and recrystallization. The moderately strong deformation texture resulting from cold rolling becomes very weak during the recovery and reordering processes by an ‘in-situ’ orientation change due to reordering that precedes recrystallization. The texture remains weak throughout recrystallization and grain growth stages. TEM investigations show evidence of twin like features during the reverse DO22→L12 transformation. This is expected to lead to fragmentation of the matrix grains resulting in a weak texture. The prominent recrystallization texture components are {025}<100> and {011}<100>, of which the latter component survives best with continued annealing.