TiAl金属间化合物合金的激光气体合金化表面改性研究

Surface Modification of TiAl Intcrmctallic Alloys by Laser Gas Alloying

对TiAl金属间化合物合金进行激光气体合金化表面改性.在激光表面改性层中成功地制得了以高硬度氮化钛为增强相的新型快速凝固“原位”耐磨复合材料.激光表面改性层厚度及显微组织与显微硬度均受激光处理工艺参数的控制.初步试验结果表明,激光气体合金化是一种很有前途的提高TiAl金属间化合物合金耐磨性的表面改性新技术.

Laser gas alloying with nitrogen was employed to improve the wear resistance of TiAl intermetallic alloys. The rapidly solidified in-situ wear resistant composite materials reinforced by hard titanium nitride were successfully fabricated in the laser modified surface layer. The microstructure and hardness of the laser modified surface are governed by the laser processing parameters. Results demonstrate preliminarily that laser gas alloying with nitrogen is a potential promising new surface modification technique for improving the wear resistance of TiAl intermetallic alloys.