| Autor: |
Yamaguchi, Yuji, Kishida, Kyosuke, Tanaka, Katsushi, Inui, Haruyuki, Tokui, Sho, Ishikawa, Kazuhiro, Aoki, Kiyoshi |
| Zdroj: |
Materials Science Forum; October 2007, Vol. 561 Issue: 1 p467-470, 4p |
| Abstrakt: |
Nb-NiTi and Nb-CoTi eutectic alloys were directionally solidified in an optical floating zone furnace. Rod-type eutectic structures with Nb rods aligned parallel to the growth direction are obtained for Nb-41Ni-40Ti grown at relatively slow growth rates below 1.0mm/h, while lamellar-type eutectic structures are obtained for Nb-35Co-34Ti grown at the same condition. The hydrogen permeability for the Nb-41Ni-40Ti DS alloy with Nb rods perpendicular to the membrane surface is 2.60×10-8mol H2 m-1 Pa-1/2 at 673K, which is about 2.5 times higher than that of as-cast sample. No hydrogen embrittlement is observed between 573 and 673K, indicating that the Nb-NiTi rod-type eutectic structure effectively suppresses the hydrogen embrittlement of Nb during hydrogen permeation. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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