(中南大学 材料科学与工程学院，长沙 410083)
摘 要: 介绍双束熔体原位复合法制备Cu-TiB2弥散强化铜合金的原理，并对其反应热力学和动力学进行研究。计算结果表明：Cu-B和Cu-Ti合金熔体碰撞时最容易形成TiB2相；TiB2粒子的形核数量随反应扩散深度的降低和母合金溶质元素浓度的增加而增加；形核数量的增加有利于获得纳米级的TiB2粒子，但增加母合金溶质元素浓度容易出现粒子团聚长大现象。据此分析了如何设计反应器形状以及反应条件的选择。
关键字: Cu-TiB2合金；原位反应；热力学；动力学
double-beam melts for preparing Cu-TiB2 alloys
（School of Materials Science and Engineering, Central South University, Changsha 410083, China）
Abstract:The principle of preparing TiB2 dispersion strengthened copper alloys by the method of in-situ reaction of double-beam melts was introduced. The thermodynamics and kinetics of in-situ reaction were also investigated. The results show that, it is easy to form TiB2 phase as Cu-B and Cu-Ti alloy melts impact each other; with the decrease of reaction diffusion depth and increase of solute element concentration of master alloy, the number of nucleation will be raised; the increase of nucleation number is favorable to the formation of nano TiB2 particles, however, the increase of solute element concentration of master alloy is very likely to cause the aggregation of TiB2 particles. Accordingly, the design of reactor and the selection of reaction conditions were analyzed.
Key words: Cu-TiB2 alloy; in-situ reaction; thermodynamics; kinetics
