(1. 中南大学 材料科学与工程学院, 长沙 410083;
2. 合肥工业大学 材料科学与工程学院, 合肥 230009)
摘 要: 利用力学性能、 电学性能测试, 金相、 电镜观察及电子衍射分析研究了不同形变热处理条件下Cu-1.5Ni-0.27Si合金性能与显微组织的关系。 结果表明： 该合金经850℃快速热轧淬火后表现为明显的变形组织， 无动态再结晶现象, 只有极少量的第二相析出。 450℃时效4h处理后, 其显微硬度达到峰值 （HV158）, 相对电导率达44%（IACS）。 δ-Ni2Si析出相粒子的平均尺寸约为15nm, 间距约为10～30nm， 与铜基体存在确定的位向关系： （110）m∥(211)ppt, ［11-0］m∥［3-24］ppt。 合金经80%的冷轧变形后， σb、 σ0.2、 显微硬度、 延伸率和相对电导率（IACS）分别达578MPa、 573MPa、 HV173、 3%和41.5%。 合金的强化机制为Orowan位错绕过机制。
关键字: Cu-1.5Ni-0.27Si； 性能； 显微组织； 形变热处理
Cu-1.5Ni-0.27Si alloy
（1. School of Materials Science and Engineering,
Central South University, Changsha 410083, China;
2. College of Materials Science and Engineering,
Hefei University of Technology, Hefei 230009, China）
Abstract:The microstructures and properties of Cu-1.5Ni-0.27Si alloy under different heat treatment conditions were examined by mechanical and electrical properties measurement, optical and transmission electron microscopes observation. The results show that the obvious deformation textures present in this alloy after rapid hot-rolling and water quenching without a marked dynamic recrystallization. And only few precipitate phases can be observed by using transmission electron microscope (TEM). The microhardness (HV) and relative electrical conductivity reach HV158 (peak value) and 44%(IACS) respectively followed by aged at 450℃ for 4h. There exists a clear orientation relationship between the precipitate δ-Ni2Si and copper matrix as follows: (110)m∥(211)ppt,［11-0］m ∥［3-24］ppt. After being cold rolled with 80% deformation, its σb, σ0.2, HV, elongation and relative electrical conductivity（IACS）reach 578MPa， 573MPa， HV173， 3% and 41.5%, respectively. The alloy is strengthened by the precipitate δ-Ni2Si through Orowan looping mechanism.
Key words: Cu-1.5Ni-0.27Si alloy; property; microstructure; thermomechanical treatment
