原位T-B／]ri复合材料的磨损性能及磨损机制.pdfVIP

维普资讯 学兔兔 May 2008 铸 造 VoI．57 NO．5 FOUNDRY 原位T-B／]ri复合材料的磨损性能及磨损机制 尚俊玲 ，李邦盛 ，任明星 ，杨 闯 ，郭景杰 (1．华南理工大学测试中心，广东广州510641；2．哈尔~-r-,A学材料科学与工程学院，黑龙江哈尔滨150001) 捅要：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”。 关键词：原位钛基复合材料；显微组织；磨损机制 中图分类号：TB33 l；TH1 17．3 文献标识码：A 文章编号：1001—4977(2008)05—0465—05 Wear Resistance and Its Mechanism of In—Situ TiB／]ri Composites SHANG Jun—ling’· ，LI Bang—sheng ，REN Ming—xing ，YANG Chuang ，GUO Jing-jie (1．Analytical and Testing Center，School of Mechanical Engineering，South China University of Technology，Guangzhou 51 0641，Guangdong，China；2．School of Materials Science and Engineering，Harbin Institute of Technology，Harbin 1 50001，Heilongjiang，China) Abstract：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一0n—disc mode friction—wear tester． Results showed that TiB whiskers are distributed uniformIv 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 surf