(中南大學(xué) 材料科學(xué)與工程學(xué)院，長(zhǎng)沙 410083)
摘 要: 介紹雙束熔體原位復(fù)合法制備Cu-TiB2彌散強(qiáng)化銅合金的原理，并對(duì)其反應(yīng)熱力學(xué)和動(dòng)力學(xué)進(jìn)行研究。計(jì)算結(jié)果表明：Cu-B和Cu-Ti合金熔體碰撞時(shí)最容易形成TiB2相；TiB2粒子的形核數(shù)量隨反應(yīng)擴(kuò)散深度的降低和母合金溶質(zhì)元素濃度的增加而增加；形核數(shù)量的增加有利于獲得納米級(jí)的TiB2粒子，但增加母合金溶質(zhì)元素濃度容易出現(xiàn)粒子團(tuán)聚長(zhǎng)大現(xiàn)象。據(jù)此分析了如何設(shè)計(jì)反應(yīng)器形狀以及反應(yīng)條件的選擇。
關(guān)鍵字: Cu-TiB2合金；原位反應(yīng)；熱力學(xué)；動(dòng)力學(xué)
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
