RESIDUAL STRESS ANALYSIS BY NEUTRON AND X-RAY DIFFRACTION APPLIED TO THE STUDY OF TWO PHASE MATERIALS: METAL MATRIX COMPOSITES

In recent years metal matrix composites (MMCs) became important in their application to structural components as materials with improved specific strength and creep properties at elevated temperatures compared to conventional alloys. When MMCs are fabricated or annealed at a high temperature and coo...

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Veröffentlicht in:Experimental techniques (Westport, Conn.) Conn.), 1996-05, Vol.20 (3), p.14-18
Hauptverfasser: Ceretti, M., Braham, C., Lebrun, J.L., Bonnafe, J.P., Perrin, M., Lodini, A.
Format: Artikel
Sprache:eng
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Zusammenfassung:In recent years metal matrix composites (MMCs) became important in their application to structural components as materials with improved specific strength and creep properties at elevated temperatures compared to conventional alloys. When MMCs are fabricated or annealed at a high temperature and cooled down to room temperature, residual stresses are induced into the matrix and the reinforcement, essentially because of the significant difference between the thermal expansion coefficients of the two constituents. These residual stresses may have undesirable effects on the mechanical properties and the fatigue damage of the materials and thus their evaluation is of fundamental importance. Residual stresses are also introduced during plastic deformation of metal matrix composites. The presence of hard reinforcement particles promotes nonhomogeneous flow in the material, resulting in residual stress when the applied load is removed. Average residual elastic strains in composites have been measured both by x-ray and neutron diffraction methods. Diffraction techniques are, in fact, powerful tools to investigate residual stresses in MMCs, since it is possible to analyze both the matrix and the reinforcement as they give separate diffraction patterns. The main objective of the present investigation is to determine thermally- and mechanically-induced residual stresses in an Al alloy reinforced by silicon carbide particulates. Both the neutron and x-ray diffraction techniques are used.
ISSN:0732-8818
1747-1567
DOI:10.1111/j.1747-1567.1996.tb00893.x