Phase Transformations in Ti–Fe Alloys Induced by High‐Pressure Torsion1. Issue 12 (23rd June 2015)

• Record Type: Journal Article
• Authors: Straumal, B. B.; Kilmametov, A. R.; Ivanisenko, Yu.; Gornakova, A. S.; Mazilkin, A. A.; Kriegel, M .J.; Fabrichnaya, O. B.; Baretzky, B.; Hahn, H.
• Is Part Of: Advanced engineering materials. Volume 17:Issue 12(2015:Dec.)
• Page Start: 1835
• Page End: 1841
• Publication Date: 2015-06-23
• Subjects: Materials -- Periodicals; 620.11
• DOI: 10.1002/adem.201500143
• Languages: English
• ISSNs: 1438-1656

Abstract

Abstract : The Ti–Fe alloys are quite important among various Ti‐based alloys doped with β‐stabilisers. Severe plastic deformation by the high pressure torsion (HPT) leads to the strong grain refinement in Ti–Fe alloys. The high‐pressure ωTi‐phase appears during HPT of the Ti–1 wt.% Fe alloy. However, the ωTi does not appear after uniaxial compression at the same pressure, without torsion. ωTi remains quenched after pressure release and disappears by heating around 140–150 °C. However, the further alloying with iron suppresses the formation of ωTi‐phase. As a result, ωTi does not appear after HPT in the Ti–10 wt.% Fe alloy. Abstract : Severe plastic deformation by high‐pressure torsion (HPT) leads to the strong grain refinement in Ti‐based alloys and to the formation of high‐pressure ω‐Ti‐phase. However, the ω‐Ti‐phase disappears in the Ti–Fe alloys with increasing contain of iron, and only the α+β mixture remains (see the dark field TEM micrograph of the Ti–10 wt% Fe alloy after HPT).