Hydrogenation Characteristics of the Matrix and the Second Phases of Ti-M-V Alloys

Ti-M-V 합금의 기지 및 제 2상의 수소화 특성

  • 조성욱 (한국지질자원연구원 자원활용연구부)
  • Published : 2003.06.15

Abstract

The structural transitions of the matrix and the second phases of $Ti_{1.0}Mn_{0.9}V_{1.1}$ and $Ti_{1.0}Cr_{1.5}V_{1.7}$ alloys upon hydrogenation have been investigated at 293K. The effect of hydrogen isotope on their crystal structures has been also discussed. The crystal structures, Phase abundance and lattice parameters of the hydrides were determined by the Rietveld method using X-ray diffraction data. At the experimental temperature, the $Ti_{1.0}Mn_{0.9}V_{1.1}$ alloy and $Ti_{1.0}Cr_{1.5}V_{1.7}$ alloy revealed different structural transition processes upon hydrogenation although the crystal structures of these two alloys are both BCC at room temperature. The second phases such as Ti-rich phase with $NiTi_2$ structure and $\alpha$-Ti with HCP structure absorbed hydrogen at relatively low hydrogen pressures and the phase abundance remained almost constant. This means that it is desirable to decrease the amount of the second phases as far as possible in order to increase the effective hydrogen storage capacities of the alloys. The crystal structures of corresponding isotope hydrides, the phase abundance and the lattice parameters did not depend on the kind of hydrogen isotope, but only on the hydrogen content.

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References

  1. E Akiha and H. Iba : "Hydrogen Absorption by Laves Phase Related BCC Solid Solution", Intermetallics, Vol. 6, 1998, pp. 461-470 https://doi.org/10.1016/S0966-9795(97)00088-5
  2. R.H. Wiswall Jr. and J.J. Reilly : "Inverse Hydrogen Isotope Effects in Some Metal Hydride Systems", Inorg. Chem., Vol. 11, No. 7, 1972, pp. 1691-1696 https://doi.org/10.1021/ic50113a050
  3. J.J. Reilly and R.H. Wiswall Jr. : "The Higher Hydrides of Vanadium and Niobium", Inorg. Chem., Vol. 9, No. 7, 1970, pp. 1678-1682 https://doi.org/10.1021/ic50089a013
  4. J.F. Lynch, J.J. Reilly and F. Millot : "The Absorption of Hydrogen by BinaryVanadium-Chromium Alloys", J. Phys. Chem. Solids, Vol. 39. 1978, pp. 883-890 https://doi.org/10.1016/0022-3697(78)90150-6
  5. G.G. Libov.itz and A.J. Maeland : "Hydride formation by B.C.C. Solid Solution Alloys". Material Science Forum, Vol. 31, 1988, pp. 177-196 https://doi.org/10.4028/www.scientific.net/MSF.31.177
  6. M.A. Pick and D.O. Welch : "Hydrogen Absorption in the Niobium-Vanadium System", Z. Phys. Chem., Vol. 114, 1979. pp. 37-43 https://doi.org/10.1524/zpch.1979.114.114.037
  7. W. Fenzl and J. Peisl : "Hydrogen in Metallic Alloys as an Example of Lattice Gas with Random Field and Random Bonds", Phys. Rev. Lett., Vol. 54. No. 19. 1985. pp. 2064-2067 https://doi.org/10.1103/PhysRevLett.54.2064
  8. L. Lichty, J. Shinar, R.G. Bames, D.R. Torgeson, and D.T. Peterson : "Composition-Dependent Hydrogen Motion in a Random Alloy, VxNb1-xH0.2: From Localized Motion at V Atoms to Long-Range Hydrogen Diffusion". Phys. Rev. Lett., Vol. 55, No. 26, 1985, pp.2895-2898 https://doi.org/10.1103/PhysRevLett.55.2895
  9. G.G. Libowitz, A.J. Maeland and J.F. Lynch : "Advanced Hydrogen Storage: Modified Vanadium Hydrides", BNL 37866, 1985, pp. 1-26
  10. F. Izumi : "Rietveld Analysis Programs RIETAN and PREMOS and Special Applications". in R.A. Young(Edi,). "The Rietveld Method", Oxford University Press, UK, 1993. pp. 236-253
  11. Y. Nakamura and E. Akiba : "New Hydride Phase with a Deformed FCC Structure in the Ti-V-Mn Solid Solution-Hydrogen System", J. Alloys Comp.. Vol. 311. 2000. pp. 317-321 https://doi.org/10.1016/S0925-8388(00)01148-8