Microstructure Comparison for AlSn20Cu Antifriction Alloys Prepared by Semi-Continuous Casting, Semi-Solid Die Casting, and Spray Forming

Antifriction alloys such as AlSn20Cu are key material options for sliding bearings used in machinery. Uniform distribution and a near-equiaxed granularity tin phase generally considered to be ideal characteristics of an antifriction alloy, although these properties vary by fabrication method. In this study, analyze the variation microstructure with method, prepared three methods: semi-continuous casting, semi-solid die spray forming. Bearing blanks subsequently from fabricated using different processes. Morphological information, total area ratio average particle diameter phase, quantitatively characterized. For deformation annealing involved casting leads prolate shape. The is 12.6 µm, overall state related direction. presents both nearly spherical strip shapes, 9.6 µm. forming blocking hot extrusion equilateral shape, 6.2 These results indicate that, preparation methods analyzed provides shortest process flow time, whereas finer more uniform tin-phase structure may obtained spray-forming process. method greatest potential industrial application, therefore promising possibility further optimization.