Segregation structures of melt-spun Cu-Si-B alloys and their high temperature deformation behaviour

Abstract

Rapidly-solidified microcrystalline alloys typically possess a fine-grained matrix with solute distributed in a cellular arrangement, either in the form of enriched cell-wall regions or as second-phase particles at the original cell walls. It is unclear whether optimal strength would be achieved when a second phase is distributed as discrete particles or as a continuous film. The microstructures and mechanical properties of a series of CuSiB alloys were examined both at room temperature and at high temperature. Depending on the alloy considered, fairly stable amorphous films, or discrete particles, arranged in a cell structure, are formed by rapid solidification. The continuous second-phase film is shown to lead to higher average internal stresses and material deformation process, during hot testing, appears to be the same as that controlling deformation in the particle-strengthened materials