摘要
本文主要讨论了Al TiO2 B系XD合成铝基复合材料的力学性能及其增强机理。研究结果表明 :当B TiO2 摩尔比从 0增加到 2时 ,棒状物Al3Ti增强相逐渐减少直至消失 ,Al2 O3颗粒分布的均匀性提高 ,TiB2 粒状弥散分布在合金基体中 ,材料的抗拉强度明显增强 ,由 2 2 4 .5MPa上升到 35 4 .5MPa,延伸率也由 3.2 %增加到 5 .6 %。Al2 O3和TiB2主要以奥罗万机制强化基体 ,而Al3Ti则以位错塞积强化基体。
The mechanical properties and strengthing mechanism of the composites fabricated by XD(Exothermic Dispersion) method in Al-TiO_2-B system were studied. It has been found that the amount of Al_3Ti phase decreased and finally disappeared, and that the ultimate strength and elongation rate of the composites increased from 224.5MPa to 354.5MPa and from 3.2% to 5.6% respectively with growth of mole rates of B/TiO_2 from 0 to 2. At same time, the distribution of the particulates Al_2O_3 in matrix was also improved. The strengthening mechanism of the particulates TiB_2 and Al_2O_3 was inorowan mode but the Al_3Ti was in dislocation plug.
出处
《材料科学与工程学报》
CAS
CSCD
北大核心
2005年第1期8-11,共4页
Journal of Materials Science and Engineering
关键词
复合材料
力学性能
摩尔比
抗拉强度
composites
mechanical properties
mole ratio
ultimate strength
