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Title: Grain size softening effect in Al{sub 62.5}Cu{sub 25}Fe{sub 12.5} nanoquasicrystals

Inverse Hall-Petch (IHP) behavior in nano-quasicrystalline Al{sub 62.5}Cu{sub 25}Fe{sub 12.5} is reported. Powders with varying grain sizes were produced by mechanical milling of spray-formed quasicrystals. The hardness of the milled powders increased with decreasing grain size down to about 40 nm and decreased with further refinement, demonstrating the IHP behavior. This critical grain size was found to be larger compared to other metallic nanocrystalline alloys. This IHP behaviour has been attributed to the structural complexity in quasicrystals and to thermally activated shearing events of atoms at the grain boundaries.
Authors:
 [1] ;  [2] ; ; ;  [3] ;  [4] ;  [5] ;  [6] ;  [7] ;  [3] ;  [8]
  1. Department of Metallurgical Engineering, Indian Institute of Technology (BHU), Varanasi 221 005 (India)
  2. Pakistan Institute of Engineering and Applied Science, P.O. Nilore, Islamabad (Pakistan)
  3. IFW Dresden, Institut für Komplexe Materialien, Postfach 27 01 16, D-01171 Dresden (Germany)
  4. Metal Extraction and Forming Division, National Metallurgical Laboratory, Jamshedpur 831007 (India)
  5. Institut für Werkstofftechnik, Universität Bremen, Badgasteiner Str. 3, D-28359 Bremen (Germany)
  6. European Synchrotron Radiation Facilities ESRF, BP 220, 38043 Grenoble (France)
  7. Department of Mechanical and Aerospace Engineering, University of Central Florida, Orlando, Florida 32816-2450 (United States)
  8. (Germany)
Publication Date:
OSTI Identifier:
22254043
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 103; Journal Issue: 20; Other Information: (c) 2013 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
77 NANOSCIENCE AND NANOTECHNOLOGY; ALLOYS; ATOMS; CRYSTALS; GRAIN BOUNDARIES; GRAIN SIZE; HARDNESS; MILLING; NANOSTRUCTURES; SPRAYS