Microstructure, oxidation resistance and high-temperature strength of γ′ hardened Pt-base alloys

M. Wenderoth, R. Völkl, S. Vorberg, Y. Yamabe-Mitarai, H. Harada, U. Glatzel

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)

Abstract

Starting from the base composition with 12 at.% Al, 6 at.% Cr, 5 at.% Ni and Pt balance, precipitation hardened Pt-Al-Cr-Ni alloys with additions of 2 at.% Mo, Re, Ru and W, respectively, were investigated. After homogenization heat treatment and air cooling, all five-component alloys show a bimodal distribution of γ′ precipitates. Along with a fraction of fine γ′ precipitates embedded in a Pt-rich matrix, some coarse primary γ′ particles are observed. Mo, Re and W additions increase strength above 1000 °C, whereas Ru has no beneficial effect on strength. W increases the γ′ volume fraction most effectively, however, the oxidation resistance is worsened dramatically by W additions. The Re-containing alloy shows the best resistance against γ′ growth and coarsening during long-term ageing.

Original languageEnglish
Pages (from-to)539-549
Number of pages11
JournalIntermetallics
Volume15
Issue number4
DOIs
Publication statusPublished - 2007 Apr 1
Externally publishedYes

Keywords

  • A. Intermetallics, miscellaneous
  • B. Alloy design
  • B. Mechanical properties at high temperatures
  • B. Oxidation
  • B. Precipitation

ASJC Scopus subject areas

  • Chemistry(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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