热轧淬火Cu-Cr系合金的性能和组织演变

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。

Properties and microstructure evolution of hot rolled-quenched Cu-Cr system alloys

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.