原位合成TiC/Ti基复合材料增强体的生长机制  

GROWTH MECHANISM OF REINFORCEMENT IN IN SITU PROCESSED TiC/Ti COMPOSITES

作　　者：吕维洁[1] 张小农[1] 张荻[1] 吴人洁[1] 卞玉群 方平伟[2] 

机构地区：[1]上海交通大学金属基复合材料国家重点实验室,上海200030 [2]上海钢铁研究所钛合金分所,上海200940

出　　处：《金属学报》1999年第5期536-540,共5页Acta Metallurgica Sinica

基　　金：国家自然科学基金!59631080;金属基复合材料国家重点实验室资助项目

摘　　要：利用Ｔｉ与Ｃ之间的自蔓延高温合成反应，经非自耗电弧熔炼工艺制备了ＴｉＣ增强的Ｔｉ基复合材料借助Ｘ射线衍射（ＸＲＤ）和光学金相显微镜分析了复合材料的物相和增强体的形态结果表明：复合材料由ＴＩＣ增强体和基体Ｔｉ合金组成．而原位合成增强体的形貌与凝固过程密切相关，ＴｉＣ增强体易长成树枝晶和等轴颗粒形状．Ａｌ元素的加入不仅固溶强化了Ｔｉ合金基体，同时通过对凝固过程的影响，使ＴｉＣ增强体更为细小，并趋向于长成等轴状粒子．TiC reinforced titanium matrix composites have been produced by non-consumablearc-melting technology utilizing the self-propagation high--temperature synthesis reaction between tita-nium and carbon. Phase identification and reinforcements morphologies observation have been performedby XRD and optical microscopy. The results show that there only exist two phases in the composites,namely TiC reinforcement and titanium matrix alloy. Reinforcements' morphologies are closely relate tothe solidification paths, TiC reinforcements airs liable to grow as dendritic and equiaxed particles. The ad-dition of aluminum element not only strengthens the titanium matrix alloy by solid solution strengthening,but also exercises effects on solidification paths which result in more fine TiC reinforcements and make TiCreinforcements grow as equiaxed particles easily.

关 键 词：复合材料 原位反应 生长机制 碳化硅 钛合金 

分 类 号：TB333[一般工业技术—材料科学与工程]