4.7 Article

Surface modification and twinning behavior in gradient graphene-based TiC/Ti6Al4V composite

Journal

APPLIED SURFACE SCIENCE
Volume 583, Issue -, Pages -

Publisher

ELSEVIER
DOI: 10.1016/j.apsusc.2022.152495

Keywords

Graphene; Friction stir process; Surface modification; Twinning

Funding

  1. National Natural Science Foundation of China [52011530181, 51901165]
  2. Materials Genome Initiative Centre of Shanghai Jiao Tong University
  3. Guangxi Science and Technology Pro-gram: The central government guides the local science and technology development science and technology innovation base project [198]
  4. Shanghai Science and Technology Commission [20S31900100]

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This study investigates the microstructure evolution and deformation behavior of graphene-based TiC/Ti6Al4V composites processed by friction stir processing. The results reveal uniform microstructure in the stir zone and distinct microstructures at different depths from the processed surface. Special crystallographic orientation relation is observed, and the hardness distribution is found to vary with depth.
Gradient materials have significant potential to break strong plastic tradeoffs. Graphene with a strong affinity for titanium alloys has an influential application value for material modification. In this study, microstructure evolution and deformation behavior of graphene-based TiC/Ti6Al4V composites processed by friction stir processing (FSP) have been investigated. Electron backscattered diffraction (EBSD) reveals uniform microstructure in the stir zone (SZ). Transmission electron microscopy (TEM) observations reveal distinct microstructures at different depths from the processed surface. The SZ includes nano/micro grains and TiC nanoplates. Twin structure exists in both alpha matrix and TiC. Stress-induced martensitic transformation is suppressed. As depth increases, TiC gradually disappears and the FSP-induced texture {-2116} <2-1-11> becomes slightly stronger. Moreover, there exists special crystallographic orientation relation: (11 1)TiC//(0001)Ti. In the base metal (BM), larger grains are observed, and dislocation structure becomes the dominant defect feature. Nanoindentation results show that hardness decreases first and then increases from the processed surface to the bulk metal. The distribution of hardness is the result of combined action of strengthening effect of TiC twins and deformation adaptation effect of alpha twins.

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