(1. 河南科技大學 材料科學與工程學院，洛陽 471003；
2. 河南科技大學 河南省有色金屬材料科學與加工技術(shù)重點實驗室，洛陽 471003；
3. 中鋁洛陽銅業(yè)有限公司，洛陽 471039)
摘 要: 通過分析固溶態(tài)Cu-Ni-Si合金時效過程中導電率的變化，根據(jù)導電率與新相析出量之間的關(guān)系計算時效過程中新相的轉(zhuǎn)變比率，在此基礎(chǔ)上，確定不同溫度下描述時效析出相轉(zhuǎn)變比率與時效時間的Avrami相變動力學經(jīng)驗方程和導電率隨時間變化的導電率方程，繪制出動力學“S”曲線，并且用固態(tài)熱分解反應機理的積分方程驗證用Avrami經(jīng)驗方程來描述合金的析出過程的正確性。對Cu-Ni-Si合金在500 ℃時效8 h后的析出相進行選區(qū)電子衍射花樣標定，發(fā)現(xiàn)析出相為δ-Ni2Si和β-Ni3Si。
關(guān)鍵字: Cu-Ni-Si合金；時效；轉(zhuǎn)變比率；相變動力學
（1. School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471003, China;
2. Henan Key Laboratory of Advanced Non-Ferrous Materials, Henan University of Science and Technology,
Luoyang 471003, China;
3. CHINALCO Luoyang Copper Co., Ltd., Luoyang 471039, China）
Abstract:The transformation ratio of new phase in Cu-Ni-Si alloy was calculated in terms of analyzing the electrical conductivity variations and the relationship between the electrical conductivity and the quantity of new phase. Both the Avrami phase transformation kinetics equation and the electrical conductivity equation changing with the aging time were derived at different temperatures, the transformation kinetics “S” curve was drawn. Then, though integral functions of the reactive mechanism of thermal decomposition of solid solution, the Avrami formulation for describing the kinetics of the phase transformation is proved to be correct. The precipitates are δ-Ni2Si and β-Ni3Si phases by indexing the selected field diffraction pattern of precipitates of Cu-Ni-Si alloy aging at 500 ℃ for 8 h.
Key words: Cu-Ni-Si alloy; aging; transformation ratio; phase transformation kinetics
