The Microstructure and strength of a V–5Cr–5Ti alloy processed by high pressure torsion

Abstract

The microstructure and the strength of high pressure torsion processed V–5Cr–5Ti alloy are investigated by X-ray line profile analysis and microhardness testing. High pressure torsion has been applied at 4 and 8 GPa with 0.25, 0.5, 1, 2, 4 and 8 rotations. The X-ray beam of the high angular resolution diffractometer, dedicated for line profile analysis, has a footprint of about 200 μm × 1.5 mm on the specimen. The diffraction patterns have been measured in the center, at half radius and close to the edge of the specimens. This technique has provided a large number of data of the microstructure and hardness as a function of strain up to about γ ≅ 300. The dislocation density determined by X-ray line broadening is correlated and discussed in terms of the strength of the alloy using the Taylor equation.