摘要
采用自蔓延和熔模精铸相结合方法制备了原位TiB晶须增强的钛基复合材料,采用X射线衍射、扫描电子显微镜对复合材料的相组成和显微组织进行了研究,并且采用销-盘式摩擦磨损试验机对该复合材料的耐磨损性能进行了评价。结果表明,TiB晶须在基体中分布均匀,尺寸细小,具有高的长径比;与基体合金相比较,钛基复合材料具有良好的抗磨损性能,且增强相长径比高的钛基复合材料的耐磨性能更好。并且根据磨损表面、磨屑形貌以及剖面显微组织特点,提出了表面"MML"区、次表层"滑移区"相结合的磨损机制。受磨损过程影响,磨屑的内部形貌呈"皱褶状"。
Combined SHS with investment casting, in-situ TiB whisker-reinforced titanium-matrix composite is fabricated. The phase composition and microstructure are studied using XRD and SEM, and wear resistance of this composite is tested by pin-on-disc mode friction-wear tester. Results showed that TiB whiskers are distributed uniformly in the matrix with fine and in high aspect ratio. Compared with matrix alloy, titanium matrix composite possesses better wear resistance, and the higher aspect ratio of reinforcement, the better wear-resistance of the composite is. Based on the morphologies of worn surface and debris and the microstructure of cross section, the wear mechanism associating surface ＂MML＂ region and sub-surface ＂sliding region＂ is put forward. After etched, morphology of the debris is found to be ＂wrinkled＂ affected by wear.
出处
《铸造》
CAS
CSCD
北大核心
2008年第5期465-469,共5页
Foundry
基金
国家重大基础研究发展规划(973)资助项目(G2000067202-2)
关键词
原位钛基复合材料
显微组织
磨损机制
in situ titanium matrix composite
microstructure
wear mechanism
