(1. 中南大學(xué) 材料科學(xué)與工程學(xué)院，長沙 410083；2. 有色金屬材料科學(xué)與工程教育部重點實驗室，長沙 410083)
摘 要: 研究不同形變熱處理條件下Cu-5.2Ni-1.2Si合金的性能與顯微組織結(jié)構(gòu)，對合金的力學(xué)性能和電學(xué)性能進行測量，并采用金相顯微鏡、透射電鏡及電子衍射分析其顯微組織。結(jié)果表明：時效前的冷變形可以加速時效析出過程，在時效初期尤為明顯；在450 ℃時效時該合金的峰時效有3種強化機制：調(diào)幅組織強化、析出的第二相粒子強化和有序強化；析出的第二相粒子主要是Ni2Si粒子；采用鑄錠—熱軋—冷軋(變形量為60%)—時效工藝處理的合金可以得到硬度和導(dǎo)電率的最優(yōu)組合。
關(guān)鍵字: Cu-5.2Ni-1.2Si合金；形變熱處理；調(diào)幅分解；有序化
（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, Changsha 410083, China ）
Abstract:Abstract: The microstructures and properties of Cu-5.2Ni-1.2Si alloy under different heat treatment conditions were examined by mechanical and electrical properties measurement, optical microscopy, transmission electron microscopy. The results show that the cold deforming before aging may accelerated the process of ageing precipitation, especially in initial period of aging. The spinodal structure, ordering and the precipitation of phase Ni2Si induce the main strengthening effects on the Cu-5.2Ni-1.2Si alloy saluted at 980 ℃ for 30 min then aged at 450 ℃ for 60 min. The optimal, synthetical properties of the Cu-5.2Ni-1.2Si alloy can be achieved by the treatment as follow: casting—hot rolling—cool rolling to 60%—aging.
Key words: Cu-5.2Ni-1.2Si alloy; thermomechanical treatment; spinodal decomposition; ordering
