Synergistic improvement of ultra-high strength and ductility of Cu-15Ni-8Sn alloy induced by multi-pass rotary swaging and aging treatment
Source abstract
Abstract
The Cu-15Ni-8Sn alloy can achieve ultra-high strength through heat treatment processes, but the significant reduction in its ductility limits its wider applications. How to synergistically enhance the strength and ductility of this alloy is a hot research topic. In this study, the industrial Cu-15Ni-8Sn alloy was taken as the research object, and the changes in alloy grain characteristics and mechanical properties under different cumulative deformations were compared by multi-pass rotary swaging deformation of the solution-state Cu-15Ni-8Sn alloy followed by aging heat treatment with different holding times. The evolution of phase structures in the rotary-forged Cu-15Ni-8Sn alloy during the aging process was investigated. The synergy mechanism of rotary swaging and aging process on the strength and ductility of the alloy was revealed. The results showed that with the increase of rotary swaging deformation, the Cu-15Ni-8Sn alloy grains gradually elongates until they tended to be fibrous, and the grain texture changed from random distribution to <111> and <100> distribution. rotary swaging deformation promotes the precipitation of the D022 ordered phase but inhibits the transformation of the D022 ordered phase to the L12 ordered phase. After 75% rotary swaging deformation and aging treatment at 400°C for 60 minutes, the ultimate tensile strength and elongation of the Cu-15Ni-8Sn alloy reaches 1405 MPa and 7.1%, respectively. Deformation strengthening caused by accumulated large strain during rotary swaging and precipitation strengthening caused by the interaction between nanoscale precipitates and dislocations during aging are the dominant mechanisms for improving the strength and plasticity of Cu-15Ni-8Sn alloy. This optimization of comprehensive mechanical properties makes the alloy very suitable for use in complex environments requiring high strength and good machining capability.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Aluminum Alloys Composites Properties · Advanced materials and composites · Metallurgy and Material Science
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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