TiC/2618复合材料的再结晶过程及高温性能

Recrystallization process and high temperature property of TiC/2618 composites prepapared by XD method

利用退火实验、金相观察及高温拉伸实验， 采用复合材料与基体合金对比的方法， 对ＸＤ 法（ 即原位反应法） 制备的ＴｉＣ（６ ％ ）／２６１８ 复合材料的再结晶过程和高温力学性能进行了研究。结果表明： 通过ＸＤ 法在２６１８ 合金中加入的硬度高而尺寸细小的ＴｉＣ 增强相能阻碍基体的再结晶， 使其再结晶温度至少提高了５０ ℃； 同时， 在高温拉伸时， ＴｉＣ 粒子能有效阻碍位错运动， 从而提高复合材料的高温力学性能。

By anneal experiment, microstructure observation and extension experiment at elevated temperature, and by comparing the composites with the matrix, the recrystallization process and the mechanical properties of high temperatures of TiC/2618 composites prepared by the XD method were studied. The results show that the recrystallization behavior of the 2618 alloy is hindered effectively by adding the fine and hard TiC particles, and its recrystallization temperature is increased at least 50 ℃, and because of the hindrance of the dislocation movement by the TiC particles, the mechanical properties of high temperatures have been increased.