原位TiB晶须增强钛基复合材料的磨损机制

将自蔓延和熔模精铸方法相结合,制备了原位TiB晶须增强钛基复合材料;采用X射线衍射仪和扫描电子显微镜分析了复合材料的相组成和显微组织,结合磨损表面、磨屑形貌及剖面显微组织分析结果探讨了复合材料表面的磨损机制;采用销-盘式摩擦磨损试验机评价了复合材料的耐磨性能.结果表明:TiB晶须尺寸细小、长径比大、在基体中分布均匀;与基体合金相比,钛基复合材料的耐磨性能显著提高,这是由于TiB晶须具有增强作用和承载作用所致.

Wear Mechanism of in-situ Ti-Based Composites Reinforced with TiB Whisker

Combined SHS with investment casting, in-situ TiB whisker-reinforced titanium matrix composites are fabricated. The phase composition and microstructure of the composites are studied by XRD and SEM. And based on the morphologies of wear surface and debris and the microstructure of cross section, the wear mechanism is probed. And wear resisting property of this composites is tested by pin-on disc mode. Results show that TiB whiskers are distributed uniformly in the matrix. They are fine and in high aspect ratio. The titanium matrix composites have much better wear resistance than the matrix alloy, which is attributed to the strengthening effect and the load-carrying capacity of the TiB whiskers.