Microstructures and hydrogen permeability of Nb-Ti-Ni alloys with high resistance to hydrogen embrittlement
Microstructures and hydrogen permeability of Nb-Ti-Ni alloys with high resistance to hydrogen embrittlement
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DOI：
10.2320/matertrans.46.1026
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发表时间：
2005-05-01
影响因子：
1.2
通讯作者：
Aoki, K
中科院分区：
文献类型：
--
作者：
Hashi, K;Ishikawa, K;Aoki, K
分别通过扫描、电子显微镜 (SEM) 和气体渗透技术研究了铸态 Nb-Ti-Ni 合金的微观结构和氢渗透率 (phi)。每种合金的 phi 值随着温度和 Nb 含量的增加而增加。在这些合金中，由初生bcc-(Nb，Ti)固溶体和共晶{(Nb，Ti)+TiNi}相组成的Nb39Ti31Ni30合金表现出最高的phi，与Pd相当。另一方面，由初生B2-TiNi化合物和共晶{(Nb，Ti)+TiNi}相组成的Nb10Ti50Ni40合金在可测量的合金中表现出最低的phi值。共晶微观结构抑制氢脆，而初生（Nb、Ti）相有助于这些合金中的氢渗透。目前的工作表明，含有共晶微观结构的双相合金有望用于具有高抗氢脆性的氢渗透膜。
Microstructures and hydrogen permeability (phi) of as-cast Nb-Ti-Ni alloys have been investigated by scanning, electron microscopy (SEM) and by the gas permeation technique, respectively. The phi value increases with increasing temperature and the amount of the Nb content for every alloy. In these alloys, the Nb39Ti31Ni30 alloy, consisting of the primary bcc-(Nb, Ti) solid solution and the eutectic {(Nb, Ti)+TiNi} phase, shows the highest phi, which is equivalent to that of Pd. On the other hand, the Nb10Ti50Ni40 alloy, consisting of the primary B2-TiNi compound and the eutectic {(Nb, Ti)+TiNi} phase, shows the lowest phi value among the alloys for which phi is measurable. Eutectic microstructures suppress the hydrogen embrittlement, while the primary (Nb, Ti) phase contributes to the hydrogen permeation in these alloys. The present work demonstrates that duplex alloys containing eutectic microstructures are promising for hydrogen permeation membranes with high resistance to the hydrogen embrittlement.