Effect of gallium addition on the microstructure and micromechanical properties of constituents in Nb[sbnd]Si based alloys

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

Research output: Contribution to journalArticle

10 Scopus citations

Abstract

The effect of gallium addition on the solidification microstructure and micromechanical properties of constituents was investigated in two sets of Nb[sbnd]16Si(1Ga) (in at.%) and Nb[sbnd]16Si[sbnd]22Ti[sbnd]2Cr[sbnd]2Al[sbnd]2Hf(5Ga) (all in at.%) alloys. The addition of gallium was found to promote the formation of Nb5Si3 and (Nb,Ti)5Si3 phases in Nb[sbnd]16Si[sbnd]1Ga and Nb[sbnd]16Si[sbnd]22Ti[sbnd]2Cr[sbnd]2Al-2Hf[sbnd]5Ga alloys, respectively. Evaluation of micromechanical properties of constituents were done by nanoindentation and micropillar compression testing. Nanoindentation showed that gallium addition reduces hardness and Young's modulus for both Nbss and silicide phases (Nb3Si and (Nb,Ti)5Si3); while it enhances fracture toughness of silicide phases. However, micropillar compressions showed that the addition of gallium decreases the compressive strength of the Nbss phase while increasing the strength of the silicides.

Original languageEnglish (US)
Pages (from-to)89-100
Number of pages12
JournalJournal of Alloys and Compounds
Volume704
DOIs
StatePublished - May 15 2017

Keywords

  • Fracture toughness
  • Intermetallic
  • Mechanical property
  • Micropillar compression
  • Nb[sbnd]Si alloy

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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