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 language | English |
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Pages (from-to) | 539-549 |
Number of pages | 11 |
Journal | Intermetallics |
Volume | 15 |
Issue number | 4 |
DOIs | |
Publication status | Published - 2007 Apr 1 |
Externally published | Yes |
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