A new beta titanium alloy system reinforced with superlattice intermetallic precipitates

Research output: Contribution to journalArticlepeer-review

Authors

  • Tea Sung Jun
  • Ayan Bhowmik
  • Nicholas G. Jones
  • T. Ben Britton
  • Finn Giuliani
  • Howard J. Stone
  • David Dye

Colleges, School and Institutes

Abstract

Titanium alloys traditionally lack a nm-scale intermetallic precipitate that can be exploited for age-hardening from solid solution. Here such a strengthening concept is developed in the Ti-Fe-Mo system, with it being found that a high temperature β (bcc A2) single-phase field for homogenisation can be obtained, which following ageing (750 °C/80 h) precipitated B2 TiFe  <100 nm in size. The orientation relationship was found to be ⟨100⟩A2//⟨100⟩B2, {100}A2//{100}B2, with a misfit of −6.1%. The alloy was found to be very hard (HV0.5 = 6.4 GPa) and strong (σy, 0.2 = 1.9 GPa) with a density of 6.68 g cm−3. TEM observation and micropillar deformation showed that the precipitates resist dislocation cutting.

Details

Original languageEnglish
Pages (from-to)71-75
Number of pages5
JournalScripta Materialia
Volume140
Early online date14 Jul 2017
Publication statusPublished - 1 Nov 2017

Keywords

  • Dislocations, Mechanical properties, Microstructure, Precipitation, Titanium alloys