B4C/Al复合材料的相及其显微组织的研究
Study on Phase and Microstructure of B4C/Al Composite
彭可武1, 马贺利1, 陈 韧1, 吴文远2
点击：3504次 下载：0次
作者单位：1. 辽宁科技学院 冶金工程系, 辽宁 本溪 117004; 2. 东北大学 材料与冶金学院, 辽宁 沈阳 110004
中文关键字：无压浸渗法； B4C/Al复合材料； 相； 显微组织
英文关键字：pressureless infiltration; B4C/Al composite; phase; microstructure
中文摘要：用无压浸渗法制备了B4C/Al复合材料。采用X射线衍射仪、能谱仪、扫描电镜、透射电镜以及光学显微镜对复合材料的相及其微观组织进行了观察及分析。结果表明，在B4C/Al复合材料中，Al3BC相沿碳化硼和铝的界面生长，增加了碳化硼和铝的界面结合强度；AlB2是类似棒状的长条晶体，嵌于碳化硼和铝之间，当材料受外力冲击时起增韧作用。该复合材料中碳化硼以连续的骨架结构存在，而渗入的铝相也以连续基体的形式存在， 形成了双连续骨架结构。该复合材料的断裂方式是沿陶瓷骨架的穿晶断裂和金属铝的桥接断裂。
英文摘要：B4C/Al composite was fabricated by pressureless infiltration. The phase and microstructure of the composite were studied by XRD, EDS, SEM, TEM and optical microscopy. The results show that, Al3BC forms on the interface of B4C and Al, connecting aluminum with ceramic toughly. AlB2 as strip crystal forms between B4C and Al, which has higher fracture toughness. The boron carbide exists in the form of continuous skeleton structure, and the infiltrated aluminum exists in the form of continuous matrix. The fracture ways of B4C/Al composite are transcrystalline rupture of ceramics skeleton and crack bridging of Al.