Hostname: page-component-8448b6f56d-jr42d Total loading time: 0 Render date: 2024-04-24T15:40:53.173Z Has data issue: false hasContentIssue false
  • English
  • Français

Influence Of Hydrogen On The Thermal Stability Of Zr-Based Quasicrystals

Published online by Cambridge University Press:  10 February 2011

D. Zander ,
U. Köster ,
N. Eliaz ,
D. Eliezer  and
D. Plachke
D. Zander
Affiliation:
Dept. Chem. Eng., University of Dortmund, D-44221 Dortmund, Germany
U. Köster
Affiliation:
Dept. Chem. Eng., University of Dortmund, D-44221 Dortmund, Germany
N. Eliaz
Affiliation:
Dept. Mat. Eng., Ben Gurion University of the Negev, Beer-Sheva 84105, Israel
D. Eliezer
Affiliation:
Dept. Mat. Eng., Ben Gurion University of the Negev, Beer-Sheva 84105, Israel
D. Plachke
Affiliation:
MPI fir Metallforschung, D-70569 Stuttgart, Germany
Get access

Abstract

The high number of tetrahedrally coordinated sites for interstitial hydrogen and the favorable hydrogen-metal chemistry make quasicrystalline Zr-Cu-Ni-Al alloys a candidate for hydrogen storage applications. The icosahedral phase in Zr69.5Cu12Ni11Al7.5 has been shown to absorb electrochemically hydrogen up to H/M = 1.6. Only partially desorption of hydrogen was observed by TDA at about 500°C. Since hydrogen desorption seems to be hindered by a surface barrier, the hydrogen remains in the quasicrystal thus influencing their thermal stability. Such effects of hydrogen were studied by DSC and microstructural investigations. With increasing hydrogen content the decomposition of icosahedral Zr69.5. Cu12Ni11A17.5 is shifted to lower temperatures. Quasicrystals decompose by a discontinous transformation into the tetragonal Zr2Cu phase, the tetragonal Zr2Ni and the hexagonal Zr6NiAl2. Hydrogenation does not influence the phases formed during decomposition, but leds to the formation of a finer microstructure. We assume that the defects formed during the hydrogenation accelerate the nucleation of the stable crystalline phase.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 553: Symposium LL – Quasicrystals , 1998 , 49
Copyright
Copyright © Materials Research Society 1999

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

1. Köster, U., Zander, D., Meinhardt, J., Eliaz, N., Eliezer, D., in Proc. 6th International Conference on Quasicrystals, Tokyo1997, edited by Takeuchi, S., Fujiwara, T., (World Scientific, Singapore 1996), p.313.Google Scholar
2. Viano, A.M., Stroud, R.M., Gibson, P.C., McDowell, A.F., Conradi, M.S., Kelton, K.F., Phys. Rev. B 51, 12026 (1995).Google Scholar
3. Bancel, P.A., Heiney, P.A., Phys. Rev. B 33, 7917 (1986).Google Scholar
4. Köster, U., Meinhardt, J., Roos, S., Liebertz, H., Appl. Phys. Lett. 69, 179 (1996).Google Scholar
5. Zander, D., Leptien, H., U. Köster, Eliaz, N., Eliezer, D., in press.Google Scholar
6. Menzel, D., Niklas, A., Köster, U., Mat.Sci.Eng. A 133, 312 (1991).Google Scholar