Characteristics of high strength extruded BS40CrFeSn alloy prepared by spark plasma sintering and hot pressing

The microstructure, mechanical properties and fracture behavior of a high strength, novel copper alloy BS40CrFeSn were studied, which are prepared by hot pressing, spark plasma sintering and casting, respectively. Duplex α/β phase structures are formed by using the β-phase raw powder, resulted from the phase transformation of the parent β-phase experienced different thermal histories combined with the extrusion deformation. The ultrafine metastable phase particles precipitated during powder pressing and consequent extrusion, serving as precipitation hardening which could elevate the mechanical strength distinctly. In the sample sintered at 1053 K, CrFe rich metastable phase coalesces and resulted in the formation of spherical coarser particles, the ductility elevated obviously.