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Anisotropy of fracture toughness of nanostructured materials controlled by grain boundary design

Thursday (27.09.2018)
15:00 - 15:15 S1/01 - A03
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Structurally heterogeneous nanostructured materials may exhibit strong anisotropy of fracture toughness if they are composed of directionally arranged microstructural features with various fracture resistance. In this work, we applied an approach of selective micromechanical testing to probe fracture toughness of structurally heterogenous sculptured TiN film with repeatedly tilted columnar grains to show the correlation between directionally arranged structural elements of which the material is composed and subsequent anisotropy of fracture toughness. The fracture toughness along grain boundaries of repeatedly tilted columnar grains being ~30% higher than that measured in the stacked direction, where the columnar grains are separated by uniform interfaces, reveals the importance of structural composition of heterogeneous materials determining the crack path and demonstrates the potential of grain boundary design as a tool to control fracture toughness of nanocrystalline materials and study anisotropic fracture behaviour.

Prof. Dr. Rostislav Daniel
Montanuniversität Leoben
Additional Authors:
  • Michael Meindlhumer
    Montanuniversität Leoben
  • Dr. Juraj Todt
    Montanuniversität Leoben
  • Walter Baumegger
    Montanuniversität Leoben
  • Prof. Dr. Christian Mitterer
    Montanuniversität Leoben
  • Prof. Dr. Jozef Keckes
    Montanuniversität Leoben