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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.

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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