Quantitative evaluation of microstructure in Mo-Si-B-TiC alloy produced by melting and tilt casting method

Sojiro Uemura, Takateru Yamamuro, Joung Wook Kim, Yasuhiro Morizono, Sadahiro Tsurekawa, Kyosuke Yoshimi

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Mo-Si-B-TiC alloys have been produced as candidates for a ultrahigh-temperature materials to replace Ni-base superalloys. We have quantitatively investigated the microstructure of a Mo-Si-B-TiC alloy composition. Mo-5Si-10B-10TiC (65Mo alloy) (at%) produced via arc-melting and tilt casting techniques. The starting material was composed of four constituent phases: Mo solid solution (Moss), Mo5SiB2, (Ti, Mo)Cx, (Mo, Ti)2C, and their eutectic (or peritecteutectic) phases. The compositions of these constituent phases were determined by EPMA. SEM-EBSD measurements revealed that T2 and (Ti, Mo)Cx phases have orientation relationships with Mo phase: {11-0}Mo//(001)T2, 〈111〉Mo//〈100〉T2 and {11-0}Mo//{11-1}(Ti, Mo)Cx, 〈111〉Mo//〈110〉 (Ti, Mo)Cx. Furthermore, 3-dimensional SEM examination combined with the FIB serial sectioning technique demonstrated that the T2 phase had a thin plate shape of orientation (001) for the plate surfaces and {100} for side ones.

Original languageEnglish
Pages (from-to)529-538
Number of pages10
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Volume80
Issue number8
DOIs
Publication statusPublished - 2016

Keywords

  • Microstructure
  • Molybdenum
  • Molybdenum-silicon-boron alloys
  • Three-dimensional analysis
  • Titanium carbide

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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