Effects of tungsten addition on hydrogen absorption and permeation properties of Nb40Ti30Ni30 alloy
Effects of tungsten addition on hydrogen absorption and permeation properties of Nb40Ti30Ni30 alloy
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DOI：
10.1016/j.jallcom.2018.03.146
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发表时间：
2018-06-15
影响因子：
6.2
通讯作者：
Yonehara, Kazuho
中科院分区：
文献类型：
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作者：
Ishikawa, Kazuhiro;Yonehara, Kazuho
在Nb40Ti30Ni30合金中加入钨，研究钨对合金组织、渗氢性能和吸氢性能的影响。加钨合金主要由初生相（Nb, Ti）和TiNi+(Nb, Ti)共晶组织组成，但钨主要集中在初生相的中心。钨的加入对其氢渗透性没有影响。氢容量随钨含量的增加而降低，加入5%的钨可使氢容量降低20%。退火后，钨在初生相中均匀溶解，偏析消失。与无钨合金相比，经退火处理的合金的氢渗透率和氢容量分别提高50%和降低10%。因此，钨可以在不降低氢渗透率的情况下降低氢容量，这有望提高抗氢脆的能力。(C) 2018 Elsevier B.V.版权所有
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. (C) 2018 Elsevier B.V. All rights reserved.