Al₂O₃/Ti₂AlN复合材料的微观组织分析

Microstructural Analysis of Al₂O₃/Ti₂AlN Composite Materials

摘要: 采用真空热压法原位形成强化相Al₂O₃，制备出Al₂O₃颗粒增强Ti₂AlN基复合材料。本文采用金相显微镜，扫描电镜，透射电镜分析了热压态复合材料的微观组织，采用x-射线衍射分析(XRD)分析了热压态复合材料的相组成。制备的Al₂O₃/Ti₂AlN复合材料由热力学稳定的α-Al₂O₃相和Ti₂AlN相组成，其中Al₂O₃颗粒弥散分布在连续的Ti₂AlN基体里。Al₂O₃相的体积分数为40% ± 5%，呈等轴状，颗粒尺寸分布在500 nm~2 μm之间，平均为1 μm左右。Ti₂AlN相晶粒为盘状，厚度大约是100 nm，长度在0.5~2 μm之间，平均几何尺寸0.3 μm左右。

Abstract: Al₂O₃ particle reinforced Ti₂AlN matrix composites were prepared by vacuum hot pressing in situ forming Al₂O₃. The microstructure of the hot-pressed composite was analyzed by metallographic microscope, scanning electron microscope and transmission electron microscope. The phase composition of the hot-pressed composite was analyzed by x-ray diffraction (XRD). The composites mainly consist of thermodynamically stable α-Al₂O₃ phase and Ti₂AlN phase. The Al₂O₃ particles are dispersed in the continuous Ti₂AlN matrix. The volume fraction of Al₂O₃ phase is 40% ± 5%. The Al₂O₃ particles that the size is between 500 nm and 2 μm with an average of about 1 μm are equiaxed. The grain of Ti₂AlN phase is disc-like, its thickness is about 100 nm, its length is between 0.5 and 2 μm, and its average geometric size is about 0.3 μm.