摘要
通过预制块在铸造Al-4.5%Cu合金熔体中的自蔓延反应,制备了TiCp/Al-4.5%Cu原位复合材料,分析了TiC形成的热力学及其原位生成过程。试验结果表明,TiCp/Al-4.5%Cu原位复合材料的拉伸性能比基体合金有大幅度地提高;原位反应生成的TiC颗粒呈小圆片状,平均直径0.15μm,与基体结合良好,无界面有害相。提出了一种新的TiC颗粒合成机制:Al依次与Ti、C发生反应生成Al3Ti和Al4C3,同时放出大量的热引发了TiC的生成;Al3Ti和Al4C3作为中间反应产物,由于热力学上的不稳定,最终被TiC取代。
In-situ composites of TiCp/Al-4.5%Cu were fabricated via self-propagating reaction of the pre-form in molten casting Al-4.5%Cu alloys. The thermodynamic analysis of the formation of in-situ reinforced phase TiC was also conducted. The experimental results showed that compared with the Al-4.5%Cu matrix, the tensile properties of TiCp/Al-4.5%Cu in-situ composites have been improved remarkably. TiC particles, average grain size 0.15 μm, are characterized by little round sheet and they are dispersed homogeneously in the matrix of α-Al, no harmful phases formed. A new synthesis mechanism of TiC was proposed： Al initially reacts with Ti and C to generate Al3Ti and AI4C3 in turn. Because of these two reactions, much heat is released simultaneously which induces the reaction between Ti and C to form TiC; Two intermediate products of Al3Ti and Al4C3 are unstable thermodynamically, so they are inevitably replaced by TiC.
出处
《铸造》
EI
CAS
CSCD
北大核心
2007年第1期49-52,共4页
Foundry
基金
陕西省教育厅专项科研计划资助项目(05JK233)
