Internal friction of Fe/Cu laminated composite metal

Recently, the demand for higher damping materials with higher strength has been requested mostly from the fine machine industries. The objective of th is study is to clarify the mechanism of higher damping as well as higher st rength by using Fe/Cu laminated composites as the model alloy. Fe/Cu lamina ted composites were made by hot rolling pure iron and oxygen-free copper la minated plates. Internal friction measurements were performed for cold roll ed 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 c apacitance detecting system. In Cu, a grain boundary peak was observed at 8 00K 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 a nd annealed specimen, respectively. In the cold rolled Fe/Cu, a rise in int ernal friction was observed between 300K and 600K. This must be due to disl ocation-solute atom interaction or the recovery process of dislocations. Al so, two further peaks were observed at 830K and 1000K. In the annealed Fe/C u, two peaks were also observed at 870K and 1050K. In both cases, these pea ks are similar to the grain boundary peaks in Cu and Fe, respectively.