Cold rolling and recrystallization textures in L1₂-type Co₃Ti ordered alloys

Abstract

The texture development during cold rolling and recrystallization of L1₂-type Co₃Ti alloys was investigated as functions of alloy composition and rolling reduction. Two kinds of fully annealed Co₃Ti alloys with different alloy compositions (Co₇₇Ti₂₃ and Co₇₈Ti₂₂), whose initial textures and grain sizes were almost identical, were used. After 70% reduction, the cold-rolling textures of both alloys were composed of strong α-fiber and weak β-fiber textures, in which the intensity of {011}〈211〉 orientation was higher than those of {112}〈111〉 and {123}〈634〉 orientations, indicating that texture transition from copper type to brass type occurred in cold-rolled Co₃Ti alloys. This texture transition was more prominently recognized in the Co₇₈Ti₂₂ alloy, whose chemical composition was more off-stoichiometric. On the other hand, the recrystallization textures of both alloys were considerably weak, and their orientation spreads were more significant with increasing rolling reduction. Also, the recrystallization textures were basically independent of alloy composition in contrast to the rolling textures.