通过制备Nb30Hf35Ni35–xCox (x = 0, 5, · · · , 35) 合金, 利用X 射线衍射仪、扫描电子显微镜等设备研究合金相组成和铸态组织随Co 含量的变化规律. 通过在不同温度、压力差条件下进行渗氢实验, 测定各成分合金的渗氢性能, 并分析合金成分和渗氢性能之间的关系. 研究结果表明, 随着Co 含量的增加, 合金中杂质化合物相的含量逐渐降低, 初生bcc-Nb 相的体积分数逐渐减小, 共晶相中的bcc-Nb 相的体积分数逐渐增大, 合金的共晶形态由棒状共晶形态逐渐演变为层片状共晶形态, 且合金的渗氢性能逐渐提高.
Nb30Hf35Ni35–xCox (x = 0, 5, · · · , 35) alloys were prepared through tungsten arc-melting. The composition and structure of the alloys was analyzed with scanning electron microscope (SEM) and X-ray diffraction (XRD). Evolution of as-cast structures with the Co content was studied. Hydrogen permeation experiments were conducted at various temperatures and pressure differentials. Relationship between hydrogen permeability and composition of Nb-Hf-Ni (Co) alloys was built. It has been shown that, as the Co content increases, the content of impurities of intermetallic phase in the alloy and volume fraction of the primary bcc-Nb phase gradually reduce, while volume fraction of the bcc-Nb in the eutectic gradually increases. Eutectic morphology changes from rods to lamellas. Hydrogen permeability of the alloys increases with increasing Co content.
[1] 肖海婷. NbHfNiV三元合金的微观结构和氢透过性研究[D]. 济南: 山东师范大学, 2012: 5-6.
[2] Ishikawa K, Seki Y, Kita K, et al. Hydrogen permeation in rapidly quenched amorphous and crystallized Nb20Ti40Ni40 alloy ribbons [J]. International Journal of Hydrogen Energy, 2011, 36: 1784-1792.
[3] Hashi K, Ishikawa K, Matsuda T, et al. Hydrogen permeation characteristics of multi-phase Ni-Ti-Nb alloys [J]. Journal of Alloys and Compounds, 2004, 368: 215-220.
[4] Hashi K, Ishikawa K, Matsuda T, et al. Microstructure and hydrogen permeability in Nb-Ti-Co multiphase alloys [J]. Journal of Alloys and Compounds, 2006, 425: 284-290.
[5] Shi F. Microstructure and hydrogen permeability of Nb40Hf30Ni30 ternary alloy [J]. International Journal of Hydrogen Energy, 2010, 35: 10556-10559.
[6] Shi F, Song X P. Effect of niobium on the microstructure, hydrogen embrittlement, and hydrogen permeability of NbxHf(1−x)/2Ni(1−x)/2 ternary alloys [J]. International Journal of Hydrogen Energy, 2010, 35: 10620-10623.
[7] Ishikawa K, Takano T, Matsuda T, et al. High hydrogen permeability in the Nb-Zr-Ni eutectic alloy containing the primary body-centered-cubic (Nb, Zr) phase [J]. Applied Physics
Letters, 2005, 87: 819061-819063.
[8] Yang J Y, Nishimura C, Komaki M. Effect of overlayer composition on hydrogen permeation of Pd-Cu alloy coated V-15Ni composite membrane [J]. Journal of Membrane Science, 2006, 282: 337-341.
[9] Yuna S, Oyama S T. Correlations in palladium membranes for hydrogen separation: a review [J]. Journal of Membrane Science, 2011, 375: 28-55.
[10] Li X Z, Yan E H, Rettenmayr M, et al. Hydrogen permeation behavior of Nb30Ti35Ni35−xCox (x = 0· · ·35) alloys containing high fractions of eutectic [J]. International Journal of Hydrogen Energy, 2014, 39: 9366-9374.
[11] Aboud S, Wilcox J. A density functional theory study of the charge state of hydrogen in metal hydrides [J]. J Phys Chem C, 2010, 114: 10978-10985.
[12] Grossbeck M L, Birnbaum H K. Low temperature hydrogen embrittlement of niobium Ⅱ—microscopic observations [J]. Acta Metallurgica, 1977, 25: 135-147.
[13] 李庆春. 铸件形成理论基础[M]. 北京: 机械工业出版社, 1982.
[14] Wang J F, Carson J K, North M F, et al. A new approach to modeling the effective thermal conductivity of heterogeneous materials [J]. Int J Heat Mass Transf, 2006, 49: 3075-3083.
[15] Wang W, Shikawa K, Aoki K. Microstructural change-induced lowering of hydrogen permeability in eutectic Nb-TiNi alloy [J]. Journal of Membrane Science, 2010, 351: 65-68.
[16] Ishikawa K, Tokui S, Aoki K. Microstructure and hydrogen permeation of cold rolled and annealed Nb40Ti30Ni30 alloy [J]. Intermetallics, 2009, 17: 109-114.
