(1. 湖北汽车工业学院 材料系，十堰 442002;
2. 北京工业大学 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粉末在机械合金化过程中的结构变化。结果表明：Cu-Al-B2O3-TiO2粉末通过机械合金化可以形成Cu(Ti， B)及Al2O3和少量的TiCu3粉末，Al2O3是通过机械合金化过程中局部的自维持反应形成的，并且有6～12h的孕育期。在所研究的体系中，先产生4Al+3TiO2=3Ti+2Al2O3的自维持反应， 此反应诱发了随后的2Al+B2O3=2B+Al2O3自维持反应。球磨过程中局部的自维持反应与普通的自蔓延反应有相似的一面，其不同点主要是点燃温度低，点燃位置多。
关键字: 机械合金化；铜合金；自维持反应；复合材料
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
