(上海交通大学 金属基复合材料国家重点实验室，上海 200240)
摘 要: 采用氢化钛粉(TiH2)和碳纳米管(CNT)为原料，通过高能球磨和真空脱氢的方法制备出具有超细晶结构的Ti粉和Ti/TiC复合材料粉，对比了晶粒细化及增强体对粉末颗粒硬度的影响。结果表明：球磨6 h后，粉末颗粒晶粒尺寸达到10 nm，CNT均匀弥散在粉末颗粒当中。经过650 ℃真空脱氢，CNT与Ti原位生成增强体TiC，粉末最终晶粒尺寸维持在50 nm左右，且粉末颗粒显微硬度较纯钛的明显提高，达到355.17 HV。最后对增强机理进行简要讨论。
关键字: 超细晶结构；高能球磨；钛；纳米复合材料；碳纳米管
（The State Key Laboratory of Metal Matrix Composites, Shanghai Jiao Tong University, Shanghai 200240, China）
Abstract:The ultrafine structured Ti powder and Ti/TiC nanocomposite powders were prepared by high-energy ball milling and dehydrogenation of TiH2 and carbon nanotube (CNT) powders. The influence of grain refinement and reinforcement on the hardness of the powder particles was also studied. The results reveal that the grain size of the powders reaches 10 nm after milling for 6 h and the CNTs are homogenously dispersed in the TiH2 powders. In situ TiC emerges after the as-milled powder was dehydrogenated at 650 ℃, and the ultimate grain size of the powder maintains around 50 nm. The microhardness of Ti/TiC powder reaches 355.17 HV, which is much higher than pure Ti powder. And the strengthening mechanism was briefly discussed.
Key words: ultrafine structure; high-energy ball milling; titanium; nanocomposite; CNT
