摘要
研究了Ａｌ－ＴｉＯ２－Ｂ反应系热扩散反应（ＸＤ）法合成铝基复合材料基体组织的细化机理．实验结果表明，在ＡＬ－ＴｉＯ２系中未加硼粉时，反应产物 Ａｌ３Ｔｉ呈细长棒状，并可贯穿基体晶粒、Ａｌ２Ｏ３为细小颗粒偏聚于基体的晶界，铝基体晶粒粗大当 Ａｌ－ＴｉＯ２系中加入硼粉后，棒状物 Ａｌ３Ｔｉ减少、当 Ｂ／ＴｉＯ２摩尔比ｒＢ／ＴｉＯ２为 ２时、Ａｌ３Ｔｉ基本消失，Ｂ与 Ａｌ３Ｔｉ反应产生的 ＴｉＢ２成为铝基体结晶时的核心，基体晶粒细化，Ａｌ２Ｏ３呈均匀分布．
The refinement mechanism of composites fabricated by exothermic dispersion method in Al-TiO2-B reaction system has been studied. The experimental results indicate that without boron, the combustion synthesized phases of the Al-TiO2 system are Al2O3 and Al3Ti, the fine Al2O3 particles exist at the interface of the matrix grains and the Al3Ti phase has the rod shape; with adding boron into the Al-TiO2 System, the amount of Al3Ti phase decreases and disappears in the system with the B/TiO2 mole ratio of 2. At that time, the TiB2 phase appears, the matrix grains are significantly refined and the distribution of Al2O3 particles is more uniform.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2002年第4期385-388,共4页
Acta Metallurgica Sinica
基金
江苏省自然科学基金资助项目BK2000003~~
关键词
热扩散反应
复合材料
显微组织
细化机理
铝基
exothermic dispersion (XD)
composite
microstructure
refinement mechanism
