Effect of in-situ synthesized TiB₂ on microstructure and mechanical property of Al/TiB₂-SiC interpenetrating phase composites

Figures & data

Figure 1. Fracture surface morphologies and pore size distributions for various TiB₂-SiC preforms with TiB₂ content of: (a)(b)(c) 15 vol%, (d)(e)(f) 20 vol%, (g)(h)(i) 25 vol%, and (j)(k)(l) 30 vol%, respectively.

Figure 2. Porosity and flexural strength of TiB₂-SiC preforms as a function of TiB₂ content.

Figure 3. Schematic illustration of TiB₂-SiC porous preform formation.

Figure 4. XRD patterns of (a) starting powders, (b) 20 vol% TiB₂-SiC preform and (c) 20 vol% Al/TiB₂-SiC composite.

Figure 5. Porosity and density of Al/TiB₂-SiC composites as a function of TiB₂ content.

Figure 6. (a) SEM micrographs of 25 vol% Al/TiB₂-SiC composite, (b) EDS elemental composition and (c) normalized Al, SiC, TiB₂ phase content as a function of TiB₂ content.

Figure 7. (a) SEM micrographs of 25 vol% Al/TiB₂-SiC composite with EDS line scanning analyses and (b) corresponding EDS line profiles of Al, Si, and Ti elements.

Figure 8. (a) Hardness of Al/TiB₂-SiC composites as a function of TiB₂ content and (b) SEM image of hardness indentation morphology of 25 vol% Al/TiB₂-SiC composite.

Figure 9. Flexural strength and fracture toughness of Al/TiB₂-SiC composites as a function of TiB₂ content.

Figure 10. EDS element distributions maps of 20 vol% Al/TiB₂-SiC composite for (a) SEM fractography, (b) Ti, (c) Al, and (d) Si.

Figure 11. SEM micrographs of the fracture surfaces for Al/TiB₂-SiC composites with different TiB₂ contents: (a)(b) 15 vol%, (c)(d) 20 vol%, (e)(f) 25 vol%, and (g)(h) 30 vol%, respectively.

Figure 12. Crack propagation path of 20 vol% Al/TiB₂-SiC composite in (a) low-magnification and (b) high-magnification.