Transformation Pathway From Alpha To Omega And Texture Evolution In Zr Via High-Pressure Torsion

Using high energy X-ray diffraction, we study the phase transition from alpha to omega in Zr via high-pressure torsion. We examine the evolution of the texture and establish the crystallographic orientation relationship between the alpha and omega phases. The orientation relationship supports the Silcock/Rabinkim direct transformation pathway and excludes the possibility of transition through the intermediate beta phase, the Usikov/Zilbershtein pathway. The texture development in both alpha and omega phases of Zr during high-pressure torsion is quantified and explained in terms of the dominant slip system and the orientation relationship during martensitic transformation. Published under license by AIP Publishing.