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Metastable Phase Formation in the Y-TI System by Ion Mixing

Published online by Cambridge University Press:  28 February 2011

S. L. Lai ,
Z. J. Zhang ,
J. R. Ding  and
B. X. Liu
S. L. Lai
Affiliation:
Tsinghua University, Department of Materials Science and Engineering, Beijing 100084, CHINA
Z. J. Zhang
Affiliation:
Tsinghua University, Department of Materials Science and Engineering, Beijing 100084, CHINA
J. R. Ding
Affiliation:
Tsinghua University, Department of Materials Science and Engineering, Beijing 100084, CHINA
B. X. Liu
Affiliation:
Tsinghua University, Department of Materials Science and Engineering, Beijing 100084, CHINA
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Abstract

Amorphization behavior was studied for the Y-Ti system, which has rather positive heat of formation being around + 22 kJ/mol, by room temperature 360 keV xenon ion mixing of YxTi100−xmultilayered films to various doses, ranging from 7×1014 to 1×1016 xe/cm2 Single and uniform amorphous phase was obtained in a narrow composition region, i.e. x=65 to 75, after ion mixing to the relevant doses. Moreover, a metastable fee crystalline Y-Ti phase was observed, for the first time, in this system. The crystalline lattice constant of the metastable phase was determined to be 4.012 Å. The re-crystallization temperature of the formed amorphous alloy was found out to be 600°C by in situ transmission electron microscope annealing as well as by vacuum furnace experiments. Possible interpretation is also discussed by comparing the experimental results with those proposed models for predicting glass forming ability.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 235: Symposium A – Phase Formation and Modification by Beam-Solid Interactions , 1991 , 515
Copyright
Copyright © Materials Research Society 1992

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References

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