Formation of titanium hydride in dilute Cu-Ti alloy by aging in hydrogen atmosphere and its effects on electrical and mechanical properties

Satoshi Semboshi, Satoshi Yamauchi, Hiroshi Numakura

Research output: Contribution to journalArticlepeer-review

Abstract

We have investigated the specific contributions of titanium-hydride precipitates to the improvement of electrical conductivity and strength for Cu-0.36 mol% Ti alloys aged in a hydrogen atmosphere at 773 K, where Cu 4Ti phase is not to appear. During the aging, titanium-hydride particles, which have a composition of H/Ti = 2, are formed by reaction of solute titanium with hydrogen diffused into the alloy. The particles have an octahedral shape with facets parallel to {111} of the matrix. The size and volume fraction of the hydride particles increase with aging time, and then level off after aging for 100 h, while the number density exhibits a maximum at 24 h. The precipitation reduces the concentration of solute titanium in the matrix and leads to significant improvement of the electrical conductivity, to the level comparable to pure copper. The dispersed TiH 2 particles gives rise to strengthening with the Orowan mechanism, of approximately 40 MPa at a maximum in yield strength.

Original languageEnglish
Pages (from-to)496-503
Number of pages8
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume76
Issue number8
DOIs
Publication statusPublished - 2012 Aug

Keywords

  • Age-hardening
  • Copper-titanium alloy
  • Electrical conductivity
  • Precipitation
  • Titanium hydride

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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