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Title: Pressure-induced amorphous-to-amorphous reversible transformation in Pr{sub 75}Al{sub 25}

A pressure-induced amorphous-to-amorphous reversible transformation was revealed in Pr{sub 75}Al{sub 25} metallic glass (MG) using in situ high-pressure synchrotron x-ray diffraction technique. The transition began at about 21 GPa with a ∼ 5% volume collapse and ended at about 35 GPa. This transition is reversible with hysteresis. Based on the high-pressure behaviors of Ce-based metallic glasses and Pr metal here, we suggest that the pressure-induced polyamorphic transition in Pr{sub 75}Al{sub 25} MG stems from 4f-electron delocalization of Pr metal which leads to abrupt change in bond shortening. These results obtained here provide new insights into the underlying mechanism of the amorphous-to-amorphous phase transition in metallic glasses and will trigger more theoretical and experimental investigations for such transition.
Authors:
; ; ; ; ;  [1] ; ; ;  [2] ;  [3]
  1. International Center for New-Structured Materials and Laboratory of New-Structured Materials, Department of Materials Science and Engineering, Zhejiang University, Hangzhou 310027 (China)
  2. Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049 (China)
  3. State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou 310027 (China)
Publication Date:
OSTI Identifier:
22258688
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 114; Journal Issue: 21; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; AMORPHOUS STATE; HYSTERESIS; LEAD; METALLIC GLASSES; SYNCHROTRONS; TRANSFORMATIONS; X-RAY DIFFRACTION