(1. 北京有色金屬研究總院 有色金屬材料制備加工國(guó)家重點(diǎn)實(shí)驗(yàn)室，北京 100088；
2. 鷹潭興業(yè)電子金屬材料有限公司，鷹潭 335000)
摘 要: 采用X射線衍射(XRD)、透射電子顯微鏡(TEM)、高分辨電子顯微鏡(HRTEM)等分析手段研究C17200合金時(shí)效過(guò)程中微觀組織演變，測(cè)試不同時(shí)效工藝處理后合金的硬度和電導(dǎo)率等性能。結(jié)果表明：合金經(jīng)320 ℃時(shí)效1 h后，基體(200)主峰的左側(cè)出現(xiàn)比較明顯的低角度邊帶峰，即合金發(fā)生調(diào)幅分解，使得在基體的(100)面上形成圓盤(pán)狀結(jié)構(gòu)的GP區(qū)。合金在時(shí)效過(guò)程中存在兩種析出方式：晶界不連續(xù)析出和晶內(nèi)連續(xù)析出，且連續(xù)析出序列為α過(guò)飽和固溶體→GP區(qū)→γ′→γ。調(diào)幅分解和γ′相析出是C17200合金在時(shí)效過(guò)程中硬度升高并達(dá)到峰值的主要原因。
關(guān)鍵字: C17200合金；時(shí)效處理；調(diào)幅分解；微觀組織
（1. State Key Laboratory of Nonferrous Metals and Process, General Research Institute for Nonferrous Metals,
Beijing 100088, China;
2. Yintan Shine Electric Metal Material Co., Ltd., Yintan 335000, China）
Abstract:The microstructure evolution of C17200 alloy was studied in the precipitation process by X-ray diffractometry, transmission electron microscopy and high-resolution transmission electron microscopy. The hardness and electrical conductivity of this alloy after various aging processes were also tested. The results show that after the alloy was aged at 320 ℃ for 1 h, low angle side-band peak is observed at the left side of (200) peak of the matrix, and disk-like GP zones form on (100) planes of the matrix by spinodal decomposition. Both discontinuous precipitation and continuous precipitation are found in the aging process of the alloy and the precipitation sequence of the continuous precipitation is α supersaturated solid solution→GP zones→γ′→γ. Making the hardness increase and reach the peak value are mainly attributed to spinodal decomposition and γ′ precipitation during the aging process.
Key words: C17200 alloy; aging process; spinodal decomposition; microstructure
