• 文献标题:   Microstructure and Mechanical Properties of Graphene Oxide-Reinforced Titanium Matrix Composites Synthesized by Hot-Pressed Sintering
  • 文献类型:   Article
  • 作  者:   LIU JQ, HU N, LIU XY, LIU YL, LV XW, WEI LX, ZHENG ST
  • 作者关键词:   titanium matrix composite, graphene oxide, hotpressed sintering, tic
  • 出版物名称:   NANOSCALE RESEARCH LETTERS
  • ISSN:   1931-7573 EI 1556-276X
  • 通讯作者地址:   Chongqing Univ
  • 被引频次:   2
  • DOI:   10.1186/s11671-019-2951-9
  • 出版年:   2019

▎ 摘  要

Ti matrix composites reinforced with 1-5wt% graphene oxide (GO) were prepared by hot-pressed sintering in argon atmosphere. The effect of sintering temperature on the microstructures and mechanical properties of the composite was also evaluated. The results show that TiC nanoparticles were formed in situ as interfacial products via the reaction between Ti and GO during sintering. With increases in GO content and sintering temperature, the amount of TiC increased, improving the mechanical properties of the composites. GO was also partly retained with a lamellar structure after sintering. The composite reinforced with 5wt% GO exhibited a hardness of 457HV, 48.4% higher than that of pure Ti at 1473K. The Ti-2.5wt% GO composite sintered at 1473K achieved a maximum yield stress of 1294MPa, which was 62.7 % higher than that of pure Ti. Further increasing the GO content to 5wt% led to a slight decrease in yield stress owing to GO agglomeration. The fracture morphology of the composite reinforced with GO exhibited a quasi-cleavage fracture, whereas that of the pure Ti matrix showed a ductile fracture. The main strengthening mechanism included grain refinement, solution strengthening, and dispersion strengthening of TiC and GO.