激光熔覆沉积钛基复合材料的组织及性能

Microstructure and Properties of Laser Clad Deposited Titanium Matrix Composites

通过在激光熔覆沉积过程中向熔池内送入一定比例纯Ti粉和B4C颗粒，直接制备出钛基复合材料，分析了所制备材料的微观组织、相组成及性能。结果表明，在激光熔覆沉积过程中，Ti粉和B4C颗粒发生原位反应，生成与基体界面结合良好的TiC和TiB增强相，TiC为短棒状或颗粒状，TiB为短纤维状，复合材料中同时有大量未完全反应的B4C颗粒存在，所制备钛基复合材料的抗拉强度、硬度较激光熔覆沉积的纯钛有较大幅度的提高。

Titanium matrix composites with in -situ formed reinforcements have been prepared by laser clad deposition process with feeding preset ratio of pure titanium and B4C particulates. The microstructure, phase and properties were analyzed and tested. The results show that, during laser clad deposition, TiC and TiB phases are formed due to the in - situ reaction between the fed titani- um powders and B4 C particulates. The interface between the in -situ reinforcements with the titanium matrix is clean and the bonding is quite well. The formed TiC phase tends to be short rod - like or granular in morphology, while the TiB phase tends to be short - fi- briform. Within the composites, there are many partially - reacted B4 C particulates. The deposited composites present higher hardness and tensile strength compared to laser clad deposited pure titanium.