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Amorphous alloys synthesized by interface-assisted ion beam mixing in the Ag–W system with the largest positive heat of formation

Published online by Cambridge University Press:  31 January 2011

R. F. Zhang  and
B. X. Liu
R. F. Zhang
Affiliation:
Advanced Materials Laboratory, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, People's Republic of China
B. X. Liu*
Affiliation:
Advanced Materials Laboratory, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, People's Republic of China
*
a)Address all correspondence to this author. e-mail: dmslbx@tsinghua.edu.cn
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Abstract

Amorphous alloys were synthesized by interface-assisted ion beam mixing in the W-rich portion of the Ag–W system. These alloys are characterized by the largest positive heat of formation among the transition-metal alloys and were formed through a two-step structural transition in the alternately deposited Ag–W films. First, during alternate deposition of the nano-sized Ag and W layers, the interfacial free energy drove the Ag–W interaction, which resulted in an intermediate body-centered-cubic (bcc) supersaturated solid solution. Second, the bcc solid solution transformed into an amorphous state upon irradiation at room temperature by 200-keV xenon ions. We report the experimental observations of the Ag–W amorphous alloy formation and a brief discussion concerning the effects of the interfacial free energy and ion irradiation dose on the structural transition observed in the Ag–W films.

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Type
Rapid Communications
Information
Journal of Materials Research , Volume 18 , Issue 7 , July 2003 , pp. 1499 - 1501
Copyright
Copyright © Materials Research Society 2003

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References

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