The Stability of γ ’-Co3(Al,W) Phase in Co-Al-W Ternary System
| Periodical | Materials Science Forum (Volumes 654 - 656) |
|---|---|
| Main Theme | PRICM7 |
| Edited by | Jian-Feng Nie and Allan Morton |
| Pages | 448-451 |
| DOI | 10.4028/www.scientific.net/MSF.654-656.448 |
| Citation | Yuki Tsukamoto et al., 2010, Materials Science Forum, 654-656, 448 |
| Online since | June, 2010 |
| Authors | Yuki Tsukamoto, Satoru Kobayashi, Takayuki Takasugi |
| Keywords | Co-Al-Wternary System, Diffusion Couple, Phase Diagram |
| Price | US$ 28,- |
The thermodynamic stability ’- Co3(Al,W) phase (L12) in the Co-Al-W ternary system at 900 ºC was investigated through microstructure and EPMA analysis on a heat-treated bulk alloy. To promote microstructural evolution, the bulk alloy was cold rolled before heat treatment. By heating at 900 ºC, the ’ phase was formed discontinuously in contact with the -Co (A1) phase. With increasing heat treatment time, however, the fraction of ’ phase decreased while that of , CoAl (B2) and Co3W (D019) phases increased. These results are consistent with our previous work with a diffusion-couple method, indicating that the ’ phase is metastable, and the three phases of, CoAl and Co3W are thermodynamically stable at 900 ºC.