Effect of germanium and silicon additions on the mechanical properties of a near-α titanium alloy

T. Kitashima, K. S. Suresh, Y. Yamabe-Mitarai

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

Abstract

The effect of Germanium (Ge) addition and simultaneous addition of Ge and Silicon (Si) on the tensile properties, impact toughness, and fracture behavior of the near-α alloy Ti-5Al-2Sn-4Zr-2Mo has been investigated at room temperature and at 650. °C. Addition of Ge monotonically increases the 0.2% yield stress (YS) and ultimate tensile stress (UTS) at both temperatures, and increases the rupture elongation at 650. °C; however, the Charpy impact toughness at both temperatures decreased. At 650. °C, this alloy ruptured in a hybrid manner, showing cracking at the germanide precipitates and plastic deformation in the surrounding matrix forming equiaxed dimples. The effect of simultaneous addition of 1. wt% Ge and 0.1. wt% Si on the mechanical properties is also discussed in relation to the effect of precipitate volume fraction and solid solution strengthening.

Original languageEnglish
Pages (from-to)212-218
Number of pages7
JournalMaterials Science and Engineering A
Volume597
DOIs
Publication statusPublished - 2014 Mar 12
Externally publishedYes

Keywords

  • Germanium
  • Mechanical property
  • Phase transformation
  • Precipitation
  • Titanium alloys

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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