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The impact of nanoindentation at room temperature upon the real structure of decagonal AlCoNi quasicrystals
Author(s) -
Reibold M.,
Belger A.,
Mukhopadhyay N. K.,
Gille P.,
Paufler P.
Publication year - 2005
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.200521040
Subject(s) - nanoindentation , nanocrystalline material , materials science , quasicrystal , dislocation , phase (matter) , crystallography , deformation (meteorology) , transmission electron microscopy , brittleness , condensed matter physics , modulus , composite material , nanotechnology , chemistry , physics , organic chemistry
Plastic deformation of the quasicrystalline decagonal phase Al 72 Co 9 Ni 19 , which appears macroscopically brittle at room temperature, has been performed by nanoindentation. Employing high resolution transmission electron microscopy it could be shown that near indents regions of a nanocrystalline phase appeared, which was identified as trigonal Al 3 (Ni,Co) 2 . So, for permanent deformation at room temperature no dislocation movement was needed. Instead, it seems reasonable to assume that the decagonal phase tends to decompose into a crystalline phase under stress. Values of nanohardness and elastic modulus determined during this work were found within the range of data reported so far by other authors. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)