(1. 貴州大學(xué) 機(jī)械工程學(xué)院，貴陽(yáng) 550025； 2. 華南理工大學(xué) 國(guó)家金屬材料近凈成形工程技術(shù)研究中心，廣州 510640)
摘 要: 通過(guò)分析機(jī)械球磨Al/TiO2/TiC復(fù)合粉末的放熱反應(yīng)及原位合成動(dòng)力學(xué)，確定Ti3AlC2/Al2O3/TiAl3復(fù)合材料的合成路徑。在此基礎(chǔ)上，結(jié)合球磨后復(fù)合粉末的微觀形貌和物相演變分析，提出復(fù)合材料的原位合成機(jī)理。結(jié)果表明：復(fù)合材料原位合成過(guò)程中存在中間產(chǎn)物TiO和TiCx；機(jī)械球磨形成的“核殼結(jié)構(gòu)”對(duì)原位合成組織細(xì)小均勻的Ti3AlC2/Al2O3/TiAl3復(fù)合材料至關(guān)重要。
關(guān)鍵字: 原位反應(yīng)；動(dòng)力學(xué)；Ti3AlC2/Al2O3/TiAl3復(fù)合材料；合成機(jī)理
（1. School of Mechanical Engineering, Guizhou University, Guiyang 550025, China; 2. National Engineering Research Center of Near-Net-Shape Forming for Metallic Materials, South China University of Technology, Guangzhou 510640, China）
Abstract:Through analyzing the exothermic reaction and in-situ synthesis kinetics of milled Al/TiO2/TiC powder mixture, the synthesis path of Ti3AlC2/Al2O3/TiAl3 composite was proposed. Furthermore, the in-situ synthesis mechanism of composite was proposed combining with investigation on morphology and phase transformation of milled powder mixture. The results show that TiO and TiCx are found to be the transitional phase, and the core/shell microstructure obtained by mechanical milling is essential for in-situ reaction synthesis of Ti3AlC2/Al2O3/TiAl3 composite with uniform fine microstructure.
Key words: in-situ reaction; kinetic; Ti3AlC2/Al2O3/TiAl3 composite; synthesis mechanism
