Effect of Heat Treatment on Microstructure and Property of Al-Sn-Pb Bearing Material

AlSn8Pb2Si2.5Cu0.8Cr0.2 is a bush material with high hardness, and the main elements tin and plumbum mainly exist along the grain boundary, resulting in bad plasticity and confectioning. It is found that the continuous tin and lead distributing along grain boundary are broken by cold-rolling, and their shape is spheroidized and uniform through annealing at constant temperature. The continuous precipitated phase composed of tin and lead doesn't exist along grain boundary. The properties of bush material are greatly increased.