Hydrogen permeation in anisotropic Nb-TiNi two-phase alloys formed by forging and rolling
Hydrogen permeation in anisotropic Nb-TiNi two-phase alloys formed by forging and rolling
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DOI：
10.1016/j.ijhydene.2017.03.127
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发表时间：
2017-04-20
影响因子：
7.2
通讯作者：
Aoki, Kiyoshi
中科院分区：
文献类型：
--
作者：
Ishikawa, Kazuhiro;Tokui, Sho;Aoki, Kiyoshi
研究了Nb-TiNi两相合金锻造和轧制过程中各向异性组织的形成以及方向和退火对渗氢率的影响。经过锻造和轧制后，颗粒状（Nb, Ti）相沿轧制方向（RD）被强烈拉长，沿法向方向（ND）被压缩。沿RD （ND）的氢透性显著增加（减少）。这种各向异性组织的氢渗透率可以用（Nb, Ti）和TiNi单相合金的氢渗透率混合定律来解释。沿RD和ND方向的氢渗透率分别对应于并联型和串联型氢渗透率。94 μ m厚RD样品的氢通量为0.57 mol H-2 m(-2) S-1 (77 cm(-2) cm(-2) min(-1))，无氢脆。与氢通量平行排列的（Nb, Ti）和TiNi相边界是氢渗透路径之一。(C) 2017氢能源出版有限责任公司，由爱思唯尔有限公司出版版权所有。
The formation of an anisotropic microstructure by forging and rolling of a Nb-TiNi two-phase alloy and the effects of direction and annealing on hydrogen permeability were investigated. After forging and rolling, the granular (Nb, Ti) phase was strongly elongated along the rolling direction (RD) and compressed along the normal direction (ND). Hydrogen permeability along the RD (ND) increased (decreased) dramatically. The hydrogen permeability of this anisotropic microstructure can be explained by the law of mixtures using the hydrogen permeabilities of (Nb, Ti) and TiNi single-phase alloys. The hydrogen permeabilities along RD and ND correspond to parallel-and series-type hydrogen permeability, respectively. The 94-mu m-thick RD sample shows a large hydrogen flux of 0.57 mol H-2 m(-2) S-1 (77 cm(-2) cm(-2) min(-1)) without hydrogen embrittlement. Phase boundary between (Nb, Ti) and TiNi phases, aligned parallel to the hydrogen flux, is one of the hydrogen permeation path. (C) 2017 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.