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Modulus anomaly in magnesium matrix composites
Author(s) -
Chowdhury A. S. M. F.,
Mari D.,
Schaller R.
Publication year - 2010
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.200925441
Subject(s) - composite material , materials science , modulus , matrix (chemical analysis) , fiber , elastic modulus , magnesium , anomaly (physics) , stress (linguistics) , relaxation (psychology) , condensed matter physics , psychology , social psychology , linguistics , philosophy , physics , metallurgy
Several magnesium matrix composites were investigated by means of mechanical spectroscopy. A modulus anomaly has been observed in the composites reinforced with fibers while the phenomenon does not occur with particles. This effect is attributed to bonding and debonding of fibers to the matrix, which is due to thermal stress relaxation by motion of dislocations. The modulus anomaly depends strongly on the orientation of the glide plane of the dislocations with respect to the matrix–fiber interface and on the aspect ratio of the fibers.