Abstract
The Cu-15Ni-8Sn alloy (UNS C72900) is a vital material for the manufacturing of precision instrument components. Employing the conventional process of “solution treatment + large cold deformation + isothermal aging” can result in a tensile strength exceeding 1200 MPa but a mere elongation of approximately 2.0 %. To enhance the reliability and service life of the Cu-15Ni-8Sn alloy, this study proposed an optimized process involving “solution treatment + large cold deformation + recrystallization heat treatment + small cold deformation + heating aging” to obtain low dislocation density, fine grains and precipitates, and uniform element distribution, thereby significantly enhancing the ductility while maintaining high strength. Compared to the conventional process, the total elongation under the optimized process was increased from 2.0 % to 11.7 %, while the tensile strength was slightly decreased from 1214 MPa to 1191 MPa. This study could offer optimized insights into the comprehensive mechanical property improvement of spinodal decomposition strengthened copper alloys.
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