连续纤维晶纯铜高温短时退火的组织和性能  

Microstructure and properties of pure copper with continuous fibrous crystal after annealing at high temperature for short time

作　　者：吴恒[1] 张鸿[1] 吕佳峰[1] 刘建刚[1] 林超[1] 陈彦旭[1] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083

出　　处：《材料热处理学报》2017年第1期31-36,共6页Transactions of Materials and Heat Treatment

基　　金：国家自然科学基金(51274265)

摘　　要：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。Microstructure, texture, coincidence site lattice （CSL） grain boundaries, mechanical properties and electrical conductivity of pure copper with continuous fibrous crystal after annealing at 860 ~C for short-time were investigated. The results show that when annealing time is 15 s, the tensile strength of the material reduces from 406. 13 MPa to 235. 15 MPa, elongation increases from 2% to the peak of 40. 80%. When annealing time is 30 s, recrystallization is completed and the electrical conductivity reaches the peak value of 103.29 % IACS which improve by 4.41% to the drawing state. Subsequently the relative amount of twins first increases, reaches the peak value of 1. 531 when annealing time is 60 s, and then tensile strength occurs a small fluctuation; the amount of E3 grain boundaries drops from 48% to 39% and the electrical conductivity declines gradually; the 〈 111 〉 grains grow up by consuming ambient 〈 100 〉 grain and elongation decreases significantly; when annealing time is 120 s, it forms a strong { 112t 〈 111 〉 copper type texture and the elongation is only 7.14%. Therefore, Annealing at 860℃ for short time not only optimize the property of pure copper with continuous fibrous crystal, but also improve the efficiency of industrial production.

关 键 词：连续纤维晶 短时退火 孪晶相对量 Σ3晶界 织构 

分 类 号：TG146.1[一般工业技术—材料科学与工程]