(1. 中南大学 材料科学与工程学院，长沙 410083；
2. 中南大学 有色金属材料科学与工程教育部重点实验室，长沙 410083)
摘 要: 利用在线热轧−淬火工艺和随后的形变热处理工艺制备Cu-Cr系列合金带材，并采用硬度、电导率测试与光学显微镜、透射电子显微镜观察的方法，研究合金在制备加工过程中的性能和组织演变。结果表明：在线热轧−淬火和后续的形变热处理工艺可成功地制备高硬度、高导电和抗软化性能优异的Cu-Cr系合金带材。具有有序FCC结构、与基体呈立方−立方位向关系的Cr相从过饱和固溶体中分解出来是时效过程中合金硬度和电导率提高的原因。Cu-Cr系合金的高硬度是细晶强化、应变强化和析出强化共同作用的结果，而高电导率是由于时效析出极大地降低了基体中溶质原子浓度。
关键字: Cu-Cr系合金；热轧−淬火；析出相；强化；抗软化性能
（1. School of Materials Science and Engineering, Central South University, Changsha 410083, China;
2. Key Laboratory of Nonferrous Metal Materials Science and Engineering, Ministry of Education,
Central South University, Changsha 410083, China）
Abstract:The strips of Cu-Cr system alloys were manufactured by online hot rolling-quenching (HR-Q) and subsequent thermomechanical treatments process. The properties and microstructure evolution of alloys were investigated by measurements of microhardness and electrical conductivity, and observations of optical microscopy (OM) and analytical transmission electron microscopy (TEM). The results show that the HR-Q and thermomechanical treatments process can successfully manufacture the strips of Cu-Cr system alloys with high hardness, high conductivity and excellent softening resistance. The Cr precipitates with ordered FCC structure, which are decomposed from the thermomechanically treated alloys, are responsible for the improvement of properties during near peak aging. The high hardness of the alloys is ascribed to the interactions of grain boundary strengthening, strain hardening and precipitation hardening, and the high electrical conductivity results from the reduction of the solute atoms concentration in the matrix during aging treatment.
Key words: Cu-Cr system alloy; hot rolling-quenching; precipitate; hardening; softening resistance
