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Thermal stress relaxation in magnesium matrix composites studied by mechanical spectroscopy

✍ Scribed by Chowdhury, A. S. M. F. ;Mari, D. ;Schaller, R.

Book ID
105364492
Publisher
John Wiley and Sons
Year
2008
Tongue
English
Weight
683 KB
Volume
205
Category
Article
ISSN
0031-8965

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✦ Synopsis

Abstract

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. (Β© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)

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