摘要
利用原位法制备了TiB2/Al复合材料。根据X-射线衍射图探讨了增强相形成机制,测定了材料凝固动态曲线并分析了影响凝固的3个主要因素,采用扫描电镜研究了材料的拉伸性能。结果表明,当B2O3与TiO2的摩尔比为1.0时,反应式为:3TiO2+10Al+3B2O3→5Al2O3+3TiB2。影响材料凝固的3个主要因素是颗粒在母相中的分布,B2O3与TiO2的摩尔比以及反应温度。材料的强化主要是TiB2颗粒的弥散强化(即奥罗万机制)和TiB2为形核核心作用所导致的晶粒细化,材料的断裂属于TiB2颗粒被拔出而形成的微孔聚集型韧性断裂。
TiB2 particle reinforced aluminum matrix composites were synthesized by in-situ reaction,and the formation mechanism of reinforcement in the composites was analyzed by XRD(X-ray diffraction),and three key factors influencing solidification process were analyzed by measuring solidified dynamic curves of the composites,meanwhile,tensile behavior of the composites was observed by the SEM(scanning electron microscope).The chemical reactive formula is described as 3TiO2 +10Al+3B2O3→5Al2O3 +3TiB2 with molar ratio of 1 of TiO2 via B2O3.The solidification process is mainly controlled by distribution of particles in the matrix,molar ratio of TiO2 via B2O3 and reactive temperature.The strengthening mechanism is characterized by dispersed enhancing from TiB2 particle and fine-grain enhancing resulting form TiB2 as nuclei substrate.Fracture mechanism of the composites is characterized by micro-hole concentrating toughening failure from TiB2 particle pulled out.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2010年第3期206-209,共4页
Special Casting & Nonferrous Alloys
关键词
原位内生
铝基复合材料
制备工艺
凝固动态曲线
拉伸性能
In-situ Synthesis,Aluminum Matrix Composites,Fabrication Process,Solidified Dynamic Curves,Tensile Behavior
