Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
7992117 | Journal of Alloys and Compounds | 2018 | 6 Pages |
Abstract
Tungsten was added to Nb40Ti30Ni30 alloys to investigate its effects on microstructure, hydrogen permeability and hydrogen absorption properties. Tungsten-added alloys consisted of a primary (Nb, Ti) phase and TiNi+(Nb, Ti) eutectic structure, although tungsten concentrated at the center of the primary phase. Tungsten addition did not change their hydrogen permeability. However, the hydrogen capacity decreased with increasing tungsten content, and 20% reduction of hydrogen capacity was attained by adding 5% tungsten. After annealing, tungsten was dissolved homogeneously in the primary phase, and segregation disappeared. The hydrogen permeability and capacity of the annealed alloy were 50% higher and 10% lower, respectively, than those of tungsten-free alloy. Thus, tungsten can reduce hydrogen capacity without degrading hydrogen permeability, which is expected to improve the resistance to hydrogen embrittlement.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Kazuhiro Ishikawa, Kazuho Yonehara,