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Nan Xu,Yuzhui Xu,Boshuo Zhang,Qining Song,Jianhua Zhao,Yefeng Bao 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.11
Double-pass friction-stir processing (FSP) with different probe lengths and coolants was conducted on a 3 mm thick Cu–30%Zn alloy plate, and a heterogeneous lamella structure (HLS) was produced along the plate thickness direction. TheHLS can be divided into three layers with their volume ratio was approximately 1:1:1, i.e., ultra-fine grain layer, fine grainlayer, and coarsened grain layer which produced by cold source assisted FSP, conventional FSP, and annealing treatment,respectively. The average hardness in ultra-fine grain layer was about 123 HV, which was significantly higher than those ofcoarsened grain layer (94 HV) and fine grain layer (105 HV). In each layer, the hardness slightly decreased with distanceincreased from the surface, but the hardness value decreased sharply in the transition zones of different layers. The HLSCu–30%Zn alloy showed yield strength of 220 MPa, ultimate tensile strength of 462 MPa, and fracture elongation of 30%. The strength-ductility synergy was attributed to the back-stress strengthening between the different layers, which induceda remarkable strain hardening at the initial stage of plastic deformation. This study provided a possible way for preparingHLS copper alloys with relatively good mechanical properties, and the HLS copper alloys have an application potential inthe manufacture of bearing, propeller, and condenser.
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