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Title: Change in atomic coordination in a heavily deformed metallic glass

The local structure around Ni and La atoms in Al{sub 85}Ni{sub 10}La{sub 5} amorphous powder after ball milling was investigated by X-ray absorption spectroscopy. A continuous decrease in coordination number of Ni and La as a function of milling time was observed, while the nearest neighbour distance and the mean square atomic displacement did not change, pointing at the creation of free volume around the Ni and La atoms. These structural changes resemble those of a liquid upon temperature increase. The results are described by a shear band model in which the coordination numbers of Ni and La are different within and outside a shear band.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [3] ;  [2]
  1. Key Laboratory for Liquid-Solid Structural Evolution and Processing of Materials, Ministry of Education, Shandong University, Jinan 250061 (China)
  2. (Germany)
  3. Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Hahn-Meitner Platz 1, D-14109 Berlin (Germany)
  4. Bundesanstalt für Materialforschung und-prüfung, Unter den Eichen 87, D-12205 Berlin (Germany)
Publication Date:
OSTI Identifier:
22304318
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 20; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ABSORPTION SPECTROSCOPY; ALUMINIUM COMPOUNDS; AMORPHOUS STATE; ATOMIC DISPLACEMENTS; ATOMS; LANTHANUM COMPOUNDS; METALLIC GLASSES; MILLING; NICKEL COMPOUNDS; POWDERS; X-RAY SPECTROSCOPY