(1. 湖北汽車工業(yè)學(xué)院 材料系，十堰 442002;
2. 北京工業(yè)大學(xué) 材料系，北京 100022;
3. Department of Mechanical Engineering，University of Waterloo， Waterloo, Ontario N2l 3G1，Canada)
摘 要: 利用XRD，SEM和DTA等方法分析了Cu-Al-B2O3-TiO2粉末在機械合金化過程中的結(jié)構(gòu)變化。結(jié)果表明：Cu-Al-B2O3-TiO2粉末通過機械合金化可以形成Cu(Ti， B)及Al2O3和少量的TiCu3粉末，Al2O3是通過機械合金化過程中局部的自維持反應(yīng)形成的，并且有6～12h的孕育期。在所研究的體系中，先產(chǎn)生4Al+3TiO2=3Ti+2Al2O3的自維持反應(yīng)， 此反應(yīng)誘發(fā)了隨后的2Al+B2O3=2B+Al2O3自維持反應(yīng)。球磨過程中局部的自維持反應(yīng)與普通的自蔓延反應(yīng)有相似的一面，其不同點主要是點燃溫度低，點燃位置多。
關(guān)鍵字: 機械合金化；銅合金；自維持反應(yīng)；復(fù)合材料
mixed powders
（1. Department of Materials Engineering，Hubei Automobile Industrial Institute，
Shiyan 442002，China;
2. Department of Materials Engineering，Beijing Polytechnic University，
Beijing 100022，China；
3. Department of Mechanical Engineering，University of Waterloo，
Waterloo，Ontario N2l 3G1, Canada）
Abstract:The structural transformation of Cu-Al-TiO2-B2O3 mixed powders during mechanical alloying process was investigated by XRD，SEM and differential thermal analysis (DTA). The results show that Al2O3，Cu(B，Ti) powders and a little of TiCu3 can be formed from Cu-Al-TiO2-B2O3 mixed powders through ball milling process. The Al2O3 is formed by a local self-sustained reaction during mechanical alloying，and a premilling period of 6～12h exits. In the system studied，the self-sustained reaction 4Al+3TiO2=3Ti+2Al2O3 occurs at first，which induce s the following self-sustained reaction 2Al+B2O3=2B+Al2O3. The self-sustained re action in mechanical alloying is similar with the self-propagating high-temperature synthesis (SHS) in some respects，the main difference of them is that the ignition temperature is low and the ignition sites are many.
Key words: mechanical alloying; copper alloy; self-sustaining reaction; composite
