Hydrogen Permeability in Nb–Ti–Ni Alloys Containing Much Primary (Nb,Ti) Phase
Hydrogen Permeability in Nb–Ti–Ni Alloys Containing Much Primary (Nb,Ti) Phase
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DOI：
10.2320/matertrans.46.2253
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发表时间：
2005-10
影响因子：
1.2
通讯作者：
W. Luo;K. Ishikawa;K. Aoki
中科院分区：
文献类型：
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作者：
W. Luo;K. Ishikawa;K. Aoki
为了开发高氢渗透性合金，研究了Nb-Ti-Ni三元合金相图中共晶相与初生相连线上的试样在氢化过程中的组织变化、显微组织和氢渗透率Φ。在共晶相含量较高的合金中，Φ值可测得，表明共晶组织抑制了氢脆。Φ值随Nb含量和初生（Nb，Ti）相体积分数的增加而增大。Nb含量最高的Nh 68 Ti 17 Ni 15合金的Φ最大，为4.91 × 10 - 8（molH 2 m - 1 s - 1 Pa - 0 . 5），比Nb-Ti-Ni合金中最高的Nh39 Ti 3 Ni 30合金高2.5倍。本工作表明，在Nb-Ti-Ni系中，氢渗透合金在连接共晶和初生相的直线上向富Nb侧延伸。
In order to develop high hydrogen permeability alloys, structural changes induced by hydrogenation, microstructures and hydrogen permeability Φ were investigated for samples on the straight line connecting the eutectic and the primary phase in the Nb-Ti-Ni phase diagram. Φ was measurable in the alloys containing much amount of the eutectic phase, indicating that the eutectic microstructure suppresses the hydrogen embrittlement. The value of Φ increased with increasing Nb content and the volume fraction of the primary (Nb,Ti) phase. The most Nb-rich Nh 6 8 Ti 1 7 Ni 1 5 alloy showed the highest Φ of 4.91 x 10 - 8 (mol H 2 m - 1 s - 1 Pa - 0 . 5 ) at 673 K, which is 2.5 times higher than that of the Nh 3 9 Ti 3 Ni 3 0 alloy, which has been reported to be highest in the Nb-Ti-Ni alloys. The present work demonstrated that the hydrogen permeable alloys are extended on the straight line connecting the eutectic and the primary phase to the Nb-rich side in the Nb-Ti-Ni system.