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Enhanced fracture toughness of boron carbide from microalloying and nanotwinning

Scripta Materialia, ISSN: 1359-6462, Vol: 162, Page: 306-310
2019
  • 26
    Citations
  • 0
    Usage
  • 23
    Captures
  • 0
    Mentions
  • 0
    Social Media
Metric Options:   Counts1 Year3 Year

Metrics Details

  • Citations
    26
    • Citation Indexes
      26
  • Captures
    23

Article Description

Fracture toughness is one of the most important mechanical properties of structural materials. Particularly, enhancing the fracture toughness of super-hard materials is essential for their applications. Here, we applied density functional theory to examine how the microalloying and nanotwinning affect the fracture toughness of superhard boron carbide (B 4 C). We find that replacing C-B-C chains with two-atom chains especially weakly coupled O atoms can significantly improve the fracture toughness of B 4 C. In addition, inserting nanotwins can significantly enhance the fracture toughness of B 4 C and boron phases. Our results provide useful information to design boron based superhard materials with enhanced fracture toughness.

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