EVOLUTION OF HOT ROLLING TEXTURES IN A TWO- PHASE (α_2 + β) Ti_3Al BASE ALLOY

摘要

Texture development during thermomechanical processing of two-phase (α_2 + β) Ti-24Al-11Nb alloy was studied as a function of variables like initial microstructure, rolling temperature, cooling con- ditions, etc. The evolution of texture in different conditions has been critically analysed. It has been found that unrestricted rolling of primary α_2 at lower temperature leads to a good basal {0001}〈uvtw〉texture, while at higher temperatures, the α2 → β → α2 phase transformation leads to weakening of the basal tex- ture. Texture of secondary α_2 derived from rolled β is generally non-basal. However, the texture of second- ary α_2 derived from recrystallized β has a basal character.