Fabrication and Investigation of Large Billets of Ti-6Al-4V Alloy with Ultrafine-Grained Structure Using SPD-Processing

摘要

This report results from a contract tasking Institute of Physics of Advanced Materials, Ufa State Aviation Technical University as follows: The present project aims to produce an ultrafine-grained (UFG) structure for the first time in large Ti-6Al-4V billets, using severe plastic deformation (SPD) processing through equal-channel angular (ECA) pressing. Special attention in this project will be devoted to the formation of a homogeneous UFG structure. The investigations will include modelling of plastic flow of the material during ECA processing, determination of factors influencing the localization of plastic strain and formation of an UFG structure, characterization of microstructure and phase composition of the alloy during ECA pressing, and the study of mechanical properties of the ECA-processed Ti-6-4 alloy.