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Thermal stress relaxation in magnesium matrix composites studied by mechanical spectroscopy
Author(s) -
Chowdhury A. S. M. F.,
Mari D.,
Schaller R.
Publication year - 2008
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.200723316
Subject(s) - materials science , composite material , dislocation , stress relaxation , stress (linguistics) , matrix (chemical analysis) , thermal , relaxation (psychology) , magnesium , metallurgy , thermodynamics , creep , psychology , social psychology , philosophy , linguistics , physics
Thermal stress relaxation at the interfaces in magnesium matrix composites has been studied by mechanical spectroscopy. Two specimens were processed by a gas pressure infiltration method. In one sample, the metallic matrix was unidirectionally oriented with respect to the matrix‐reinforcement interface by a Bridgman technique, while the other was kept as infiltrated. The results show a strong dependence of the damping on the orientation of the matrix. The results are compared with a model of thermal stress relaxation by dislocation motion controlled by a solid friction mechanism. A fitting parameter proportional to the mobile dislocation density is obtained showing the entire evolution of the mobile dislocation density with respect to the temperature. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)