Thermal stress relaxation in magnesium matrix composites studied by mechanical spectroscopy | Zendy

Chowdhury A. S. M. F. | Zendy; Mari D. | Zendy; Schaller R. | Zendy

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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)

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