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Metastable Crystalline Phases Synthesized by Ion Beam Mixing in Some Nb-Based Binary Metal Systems

Published online by Cambridge University Press:  22 February 2011

B.X. Liu  and
Z.J. Zhang
B.X. Liu
Affiliation:
Department of Materials Science and Engineering, Tsinghua University. Beijing 100084, CHINA. Center of Condensed Matter and Radiation Physics, CCAST(World Laboratory), Beijing 100080, CHINA.
Z.J. Zhang
Affiliation:
Department of Materials Science and Engineering, Tsinghua University. Beijing 100084, CHINA. Center of Condensed Matter and Radiation Physics, CCAST(World Laboratory), Beijing 100080, CHINA.
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Abstract

In the Nb-rich Nb-Fe(Co,Ni) multilayered films, two metastable crystalline (MX) phases of hep and fee structures were formed by room temperature 200 keV xenon ion mixing. The phase formation was through a two-step transition, Le. a first shearing of bcc—>hcp and then a sliding of hep—>fcc. The free energy curves of the observed MX phases were calculated and included into the free energy diagram together with those of the terminal solid solutions, the amorphous phase and the equilibrium intermetaШc compounds. An independent comparative thermal annealing experiment was conducted with the corresponding as-deposited multilayers and the results certified the emerging sequence of the MX phases being exactly the same as the calculated diagram predicted. Moreover, a crystallographic model was figured out for the bec—>hcp—>fcc transition and the resultant lattice parameters agreed well with the experimental ones.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 316: Symposium A – Materials Synthesis and Processing Using Ion Beams , 1993 , 283
Copyright
Copyright © Materials Research Society 1994

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References

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