摘要
本文用ＸＲＤ、ＳＥＭ和ＴＥＭ研究了ＴｉＣ颗粒增强钨基复合材料（ＴｉＣｐ／Ｗ，ＴｉＣｐ体积分数为３０％）的组织结构。结果表明，由于ＴｉＣｐ的加入，阻碍Ｗ晶粒在烧结时的长大；复合材料的致密度较纯Ｗ的有所提高； Ｗ向ＴｉＣ晶格发生扩散，在ＴｉＣ中形成（Ｔｉ，Ｗ） Ｃ固溶体， Ｔｉ也向Ｗ中发生少量扩散．使ＴｉＣｐ／Ｗ界面形成冶金结合。在复合材料中没有发现Ｗ２Ｃ和ＷＣ相。复合材料的韧性、弹性模量和硬度都明显比纯Ｗ的高。复合材料的韧化机制是裂纹偏转和细品动化。
The microstructures of TiC particle-reinforced tungsten matrix composite(TiCp /W, volume percent of TiC particles is 30%) were investigated by means of XRD, SEM and TEM. The incorporation of TiC particles inhabited the growth of tungsten grains during sintering. The relative density of the composite is higher than that of monolithic tungsten. W atom diffused into the lattice of TiC, resulting in formation of (Ti, W)C solid solution in TiC particle, and a little Ti diffused in W lattice, resulting in metallurgical bonding of TiC particle to W matrix. W2C and WC phases were not found in the composites. The fiacture toughness, elastic modulus and hardness of the composite were increased due to the addition of TiC particles. The toughening mechanism of TiCp /W composite is crack deflection and grains refining.
出处
《有色金属》
CSCD
2000年第1期78-82,共5页
Nonferrous Metals
基金
航天部"九五"预研项目!18.10
关键词
钨基
复合材料
组织结构
力学性能
颗粒增强
tungstenh composite, TiC microstructures, mechanical properties
toughening mechanism
