Hydrogen permeation and structural features of melt-spun Ni–Nb–Zr amorphous alloys
Hydrogen permeation and structural features of melt-spun Ni–Nb–Zr amorphous alloys
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DOI：
10.1016/j.actamat.2005.04.023
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发表时间：
2005-08
期刊：
影响因子：
9.4
通讯作者：
S. Yamaura;M. Sakurai;M. Hasegawa;K. Wakoh;Y. Shimpo;M. Nishida;H. Kimura;E. Matsubara;A. Inoue
中科院分区：
文献类型：
--
作者：
S. Yamaura;M. Sakurai;M. Hasegawa;K. Wakoh;Y. Shimpo;M. Nishida;H. Kimura;E. Matsubara;A. Inoue
采用熔体旋压技术制备了非晶态(Ni0.6Nb0.4)100−xZrx(x=0、20、30、40和50at.%)合金，并检测了通过这些合金膜的氢渗透情况。还通过径向分布函数（RDF）分析研究了这些合金中的局部原子结构。此外，还测量了氢的溶解度和扩散率，以讨论氢渗透的机理。 Ni-Nb-Zr非晶合金的磁导率随着Zr含量和温度的增加而增加。 (Ni0.6Nb0.4)50Zr50非晶合金在673K时的最大氢渗透率为1.59×10−8molm−1s−1Pa−1/2。 (Ni0.6Nb0.4)50Zr50非晶合金表现出比(Ni0.6Nb0.4)70Zr30非晶合金更大的氢溶解度和扩散率。结果，(Ni0.6Nb0.4)50Zr50非晶合金在673K时表现出比(Ni0.6Nb0.4)70Zr30非晶合金更高的氢渗透率。 RDF分析表明Zr原子之间的原子距离因氢化而增加。在(Ni0.6Nb0.4)70Zr30和(Ni0.6Nb0.4)50Zr50非晶合金中发现Zr坐标数量远高于Ni和Nb坐标数量的化学有序性。详细讨论了非晶局部结构与渗透之间的关系。
Amorphous (Ni0.6Nb0.4)100−xZrx(x=0, 20, 30, 40 and 50at.%) alloys were prepared by the melt-spinning technique, and the hydrogen permeation through those alloy membranes was examined. The local atomic structure in these alloys was also investigated by radial distribution function (RDF) analysis. Moreover, hydrogen solubility and diffusivity were also measured in order to discuss the mechanism for hydrogen permeation. The permeability of the Ni–Nb–Zr amorphous alloys increases with Zr content and temperature. The maximum hydrogen permeability is 1.59×10−8molm−1s−1Pa−1/2at 673K for the (Ni0.6Nb0.4)50Zr50amorphous alloy. The (Ni0.6Nb0.4)50Zr50amorphous alloy showed larger hydrogen solubility and diffusivity than the (Ni0.6Nb0.4)70Zr30amorphous alloy. As the result, the (Ni0.6Nb0.4)50Zr50amorphous alloy showed higher hydrogen permeability than the (Ni0.6Nb0.4)70Zr30amorphous alloy at 673K. The RDF analysis shows that the atomic distance between the Zr atoms increases by hydrogenation. The chemical ordering such that the number of Zr coordinates is much higher than that of Ni and Nb coordinates was found in the (Ni0.6Nb0.4)70Zr30and (Ni0.6Nb0.4)50Zr50amorphous alloys. The relation between the amorphous local structure and the permeation was discussed in detail.