Microstructural Design for Improved Mechanical Behaviour of Advanced Materials
J. Phys. IV France 10 (2000) Pr6-113-Pr6-117
Internal friction of Fe/Cu laminated composite metalN. Igata1, M. Sasaki2, Y. Kogo1 and K. Hishitani1
1 Department of Materials Science and Technology, Science University of Tokyo, 2641 Yamazaki, Noda, Chiba 278-8510, Japan
2 Nippon Metal Industry Co. Ltd., 1-30 Ohyama, Sagamihara, Kanagawa 229-1184, Japan
Recently, the demand for higher damping materials with higher strength has been requested mostly from the fine machine industries. The objective of this study is to clarify the mechanism of higher damping as well as higher strength by using Fe/Cu laminated composites as the model alloy. Fe/Cu laminated composites were made by hot rolling pure iron and oxygen-free copper laminated plates. Internal friction measurements were performed for cold rolled and annealed Fe/Cu laminated samples as well as Fe and Cu samples, using a transverse vibration method with an electrostatic driving system and a capacitance detecting system. In Cu, a grain boundary peak was observed at 800K and 870K in the cold rolled and annealed specimen, respectively. In Fe, a grain boundary peak was observed at 1030K and 1050K in the cold rolled and annealed specimen, respectively. In the cold rolled Fe/Cu, a rise in internal friction was observed between 300K and 600K. This must be due to dislocation-solute atom interaction or the recovery process of dislocations. Also, two further peaks were observed at 830K and 1000K. In the annealed Fe/Cu, two peaks were also observed at 870K and 1050K. In both cases, these peaks are similar to the grain boundary peaks in Cu and Fe, respectively.
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