Determination of parent orientation maps in advanced titanium-based alloys.

In the past few years, reconstruction methods have been developed and applied successfully to restore the beta microtexture in titanium alloys. This contribution shows how these methods are extended to other transformations often encountered in advanced titanium alloys: the alpha (hcp)-->gamma (tetragonal) and the beta (bcc)-->O (orthorhombic) transformation. The efficiency of the restitution depends on specific crystallographic features of the investigated phase transformations. Therefore, the paper outlines these crystallographic specificities for some advanced titanium alloys. To illustrate the capability of the method to reconstruct the parent phase, different restored parent microtextures of these alloys are presented. The results show that the reconstruction methods are an efficient tool to study the microstructure and texture modifications induced by these phase transformations.