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Al-Yb Amorphous Alloys Produced by Ion Mixing or Solid State Reaction

Published online by Cambridge University Press:  28 February 2011

B. X. Liu ,
J. R. Ding ,
D. Z. Che  and
H. B. Zhang
B. X. Liu
Affiliation:
Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
J. R. Ding
Affiliation:
Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
D. Z. Che
Affiliation:
Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
H. B. Zhang
Affiliation:
Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
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Abstract

We report, in this paper, three different ways of producing amorphous alloys in the Al-Yb system, (i) Al80Yb20multilayered films were readily amorphized by 180 keV xenon ion mixing at room temperature(RT) to a dose of 3×1015 Xe/cm2. (ii) When the dose went up to 1×1016 Xe/cm2 or higher, a metastable phase of hcp structure was formed. Interestingly, the hcp phase turned into amorphous after annealing at 500°C for about 10 minutes. (iii) Amorphous alloys were also formed by steady state thermal annealing of the Al-Yb multilayered films at about 450 °C for 20 minutes. The optimum amorphization range was found out by experiments to be 17 to 30 Yb at%, i.e., within this composition range, the multilayered films could entirely be amorphized by solid state reaction.

The recrystallization behavior of the amorphous alloys formed by different methods was also studied and the difference in this aspect was thought to relate to the structures resulting from different processing methods.

Possible explanation of the observed sequence of phase transition is also discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 235: Symposium A – Phase Formation and Modification by Beam-Solid Interactions , 1991 , 521
Copyright
Copyright © Materials Research Society 1992

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References

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