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,
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.
Paper ID: CTR10482J