Mechanical properties of microconstituents in Nb-Si-Ti alloy by micropillar compression and nanoindentation

Enyu Guo, Sudhanshu S. Singh, Chandrashekara S. Kaira, Xianyu Meng, Yanjin Xu, Liangshun Luo, Mingyue Wang, Nikhilesh Chawla

Research output: Contribution to journalArticlepeer-review

23 Scopus citations


The micromechanical properties of both Nb solid solution (Nbss) and (Nb,Ti)3Si silicide in a ternary Nb-16Si-22Ti (in at%) alloy were evaluated by nanoindentation and micropillar compression techniques. Nanoindentation tests showed that (Nb,Ti)3Si possesses much higher hardness (15.6±0.6 GPa) and Young's modulus (253.3±8.4 GPa) than Nbss (5.2±0.4 GPa and 124.9±5.1 GPa, respectively). Stress-strain curves of each constituent were obtained by micropillar compression. The stress-strain behavior showed that (Nb,Ti)3Si exhibited a brittle fracture mode, while Nbss was able to bear large ductile deformation. The compressive failure strength of (Nb,Ti)3Si intermetallic and yield strength of Nbss were found to be 8.4±1.2 GPa and 0.9±0.1 GPa, respectively. The fracture toughness of the (Nb,Ti)3Si phase evaluated by cracks emanating from nanoindentation, was measured to be ~2.3 MPa-m1/2.

Original languageEnglish (US)
Pages (from-to)99-106
Number of pages8
JournalMaterials Science & Engineering A: Structural Materials: Properties, Microstructure and Processing
StatePublished - Feb 27 2017


  • Fracture toughness
  • High temperature alloy
  • Intermetallics
  • Mechanical properties
  • Micropillar compression

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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