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Many surface treatment techniques are used to improve the mechanical behavior of metal matrix composites (MMC) under dynamic loading. Mill machining, shot-peening, hammering, and cold-rolling are the four techniques commonly used. In this paper, we study the effect of the surface treatment with the cold-rolled technique on the residual stresses in an aluminum alloy 7075 reinforced with 27% vol fraction SiC whiskers.
The techniques used to measure the residual stresses are X-ray and neutron diffraction methods. Neutron diffraction is a nondestructive technique that allows one to evaluate the residual stresses in both the Al matrix and the SiC whiskers. The X-ray technique was used to evaluate the residual stresses at the surface of the composite material. The results show us that the cold-rolled treatment induced a steep stress gradient near the surface. The comparison of using the two different measuring techniques will be discussed.
Maitre de Conferences and professor, Laboratoire Science des Matériaux, Université de Reims Champagne-Ardenne,
Professor, Genie System Mécanique, U.T.T., Troyes,
Research engineer and Post-Dr., Laboratoire Leon Brillouin, CEA-CNRS, CEN-Saclay, Gif sur Yvette Cedex,
Stock #: CTR10482J