放电等离子烧结合成TiC/TiB_2颗粒增强的超细晶钛基复合材料  

Ultrafine-grained Ti-based composites reinforced by TiC/TiB_2 particles fabricated by spark plasma sintering

作　　者：陈友[1] 梁甲宏[1] 杨超[1] 李元元[1] 

机构地区：[1]华南理工大学国家金属材料近净成形工程技术研究中心,广州510640

出　　处：《中国科学：物理学、力学、天文学》2011年第11期1277-1286,共10页Scientia Sinica Physica,Mechanica & Astronomica

基　　金：国家重点基础研究发展计划(编号:2010CB635104);国家自然科学基金(批准号:50801028)资助项目

摘　　要：采用放电等离子烧结技术结合非晶晶化法制备了不同体积分数的TiC/TiB2颗粒增强的超细晶钛基复合材料.运用X射线衍射分析、扫描电子显微镜和万能材料试验机等实验手段,对合成的超细晶钛基复合材料进行测试分析.结果表明:随着外加TiC/TiB2颗粒的增加,钛基复合材料试样的致密度逐渐降低.TiC颗粒与基体不发生反应,而TiB2颗粒的加入改变了TiB2颗粒与基体界面的组织形貌,但对远离界面处的基体组织形貌没有影响,其组织均由-Ti(Nb)相和(Cu,Ni)-Ti2相组成,且-Ti(Nb)相连续分布.同时,TiC颗粒的增强效果优于TiB2颗粒,35vol.%(体积分数)TiC颗粒增强的复合材料试样的断裂强度最高,达2209MPa.Ultrafine-grained Ti-based composites reinforced by TiC/TiB 2 particles with different volume fractions were fabricated by spark plasma sintering （SPS） and crystallization of amorphous phase. The fabricated ultrafine-grained composites were examined by X-ray diffraction （XRD）, scanning electron microscopy （SEM） and universal materials tester. Results show that the relative densities of the samples decrease with the increase of the TiC/TiB 2 addition. No reactions are observed to occur between the matrix and the TiC particles; the addition of TiB 2 particles greatly changes the interface between the TiB 2 particles and the matrix, but has little influence on the matrix, which is composed of continuously distributed-Ti（Nb） phase and （Cu, Ni）-Ti 2 phase. Moreover, the Ti-based composites with TiC particles have higher fracture strength than those with TiB 2 particles. The sample with 35 vol.% TiC particles has the highest fracture strength of 2209 MPa.

关 键 词：钛基复合材料 颗粒增强 放电等离子烧结 非晶晶化 

分 类 号：TB331[一般工业技术—材料科学与工程]