STABILITY OF ROLLING TEXTURE DURING HEAT TREATMENT IN A TWO-PHASE Ti_3Al BASE INTERMETALLIC ALLOY

摘要

The stability of hot rolling texture developed in the α_2 phase of a two-phase Ti_3Al base interme- tallic alloy, during subsequent heat treatment, has been systematically investigated. The basal hot rolling texture remains rather stable during recrystallization annealing at temperatures within the single phase α_2 range. Grain growth after recrystallization produces extra orientations other than the basal. For the ma- terial with a starting basal texture, heat treatment in the upper α_2, (α_2 + β) or β phase fields does not change the basic character of the texture, although the sharpness and especially the width of the basal com- ponent increase to some extent with the increase in the heat treatment temperature. Heat treatment of ma- terial with starting non-basal texture in the upper α_2, (α _2 + β) or β phase fields does not produce any basal component irrespective of the heat treatment temperature. When the starting material is reasonably strain free and possesses a weak basal texture, heat treatment in the upper α_2, (α_2 + β) or β phase fields helps in intensifying the basal component to a certain extent.