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研究了连续纤维晶纯铜线材860℃短时退火的显微组织、织构和CSL晶界以及力学性能和导电性能的变化规律。结果表明:退火15 s,抗拉强度由406.13 MPa降到235.15 MPa,降幅达42.10%,断后伸长率由2%升到峰值40.80%。退火30 s,完成再结晶,导电率达到峰值103.29%IACS,相对拉拔态的98.93%IACS提高4.41%。随后孪晶相对量先增加后降低,60 s时达到峰值1.531,抗拉强度出现小幅波动;Σ3晶界由48%降低至39%,导电率也逐步下降;<111>晶粒消耗周围<100>晶粒而长大,断后伸长率下降显著;退火120 s,形成强的{112}<111>铜型织构,断后伸长率仅为7.14%。因此连续纤维晶纯铜线材,860℃短时退火能够优化线材性能,同时提高工业生产效率。
The microstructures, texture and CSL grain boundaries as well as the mechanical properties and electrical conductivity of continuous-fiber pure copper wires annealed at 860 ℃ were investigated. The results show that after annealing for 15 s, the tensile strength decreases from 406.13 MPa to 235.15 MPa, decreasing by 42.10%. The elongation after breaking increases from 2% to 40.80%. Annealing 30 s, complete recrystallization, the conductivity reached the peak 103.29% IACS, relative drawing state 98.93% IACS increased 4.41%. The relative amount of twins first increased and then decreased, reaching a peak value of 1.531 at 60 s, showing a slight fluctuation in tensile strength; the Σ3 grain boundary decreased from 48% to 39%, and the conductivity decreased gradually; > Grain growth, the elongation decreased significantly after cutting; annealing 120 s, forming a strong {112} <111> copper texture, the elongation after fracture was only 7.14%. Therefore, continuous fiber crystalline copper wire, 860 ℃ short-term annealing can optimize the wire performance, while improving industrial production efficiency.