(1. 中南大學(xué) 材料科學(xué)與工程學(xué)院, 長(zhǎng)沙 410083;
2. 合肥工業(yè)大學(xué) 材料科學(xué)與工程學(xué)院, 合肥 230009)
摘 要: 利用力學(xué)性能、 電學(xué)性能測(cè)試, 金相、 電鏡觀察及電子衍射分析研究了不同形變熱處理?xiàng)l件下Cu-1.5Ni-0.27Si合金性能與顯微組織的關(guān)系。 結(jié)果表明： 該合金經(jīng)850℃快速熱軋淬火后表現(xiàn)為明顯的變形組織， 無(wú)動(dòng)態(tài)再結(jié)晶現(xiàn)象, 只有極少量的第二相析出。 450℃時(shí)效4h處理后, 其顯微硬度達(dá)到峰值 （HV158）, 相對(duì)電導(dǎo)率達(dá)44%（IACS）。 δ-Ni2Si析出相粒子的平均尺寸約為15nm, 間距約為10～30nm， 與銅基體存在確定的位向關(guān)系： （110）m∥(211)ppt, ［11-0］m∥［3-24］ppt。 合金經(jīng)80%的冷軋變形后， σb、 σ0.2、 顯微硬度、 延伸率和相對(duì)電導(dǎo)率（IACS）分別達(dá)578MPa、 573MPa、 HV173、 3%和41.5%。 合金的強(qiáng)化機(jī)制為Orowan位錯(cuò)繞過(guò)機(jī)制。
關(guān)鍵字: Cu-1.5Ni-0.27Si； 性能； 顯微組織； 形變熱處理
Cu-1.5Ni-0.27Si alloy
XU Gen-ying2, WANG Yan-hui1, HONG Bin1, XIAO Cong-wen1
（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
