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タイトル: | Chemical Diffusion in the Iridium-Rich A1 and L12 Phases in the Ir-Nb System |
著者: | Numakura, Hiroshi Watanabe, Tatsuru Uchida, Makoto Yamabe-Mitarai, Yoko Bannai, Eisuke |
著者名の別形: | 沼倉, 宏 |
発行日: | 2006 |
出版者: | Springer Boston |
誌名: | Journal of phase equilibria and diffusion |
巻: | 27 |
号: | 6 |
開始ページ: | 638 |
終了ページ: | 643 |
抄録: | The diffusion in iridium-rich Ir-Nb alloys has been studied by single-phase interdiffusion experiments. The chemical diffusion coefficient has been measured for the primary fcc solidsolution and the L12 ordered compound Ir3Nb in the temperature range between 1650 and 1950 °C, using Ir/Ir-8Nb and Ir-26Nb/Ir-28Nb diffusion couples, respectively (numbers indicate mol%). While the chemical diffusion coefficient in the solid-solution phase is close to the tracer self-diffusion coefficient of pure iridium, the diffusion in the compound phase is extremely slow: the chemical diffusion coefficient is 1⁄40 to 1⁄50 of that in the solid solution. The low diffusion rate in the compound must be beneficial for high-temperature performance of refractory superalloys based on the Ir-Nb system. |
著作権等: | ©ASM International |
URI: | http://hdl.handle.net/2433/48904 |
DOI(出版社版): | 10.1361/1054770306X153666 |
出現コレクション: | 学術雑誌掲載論文等 |
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