Microstructure and mechanical properties of Mo-Si-Al alloy and Mo-Si-Al/SiC composite

Yoshikazu Suzuki, Atsushi Nakahira, Tohru Sekino, Koichi Niihara

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

Mo-Si-Al alloy and Mo-Si-Al/SiC composite were fabricated by the powder metallurgical process from a novel Mo-Si-Al prealloyed powder, and their microstructure and mechanical properties were evaluated. The Mo-Si-Al and Mo-Si-Al/15 vol%SiC mixed powders were hot-pressed in an argon atmosphere. XRD analyses revealed that Mo-Si-Al/SiC composites were composed of MoSi2 (tetragonal, C11b structure), Mo(Si,Al)2 (hexagonal, C40 structure), α-Al2O3, Mo≤5Si3C≤1 and Β-SiC. Almost no glassy SiO2 phase was found in Mo-Si-Al and Mo-Si-Al/SiC systems contrary to MoSi2 and MoSi2/SiC. The formation of α-Al2O3 was attributed to the predominant oxidation of aluminum at the surface of the Mo-Si-Al prealloyed powder. Mo-Si-Al based systems showed the better high-temperature strength mainly due to the elimination of glassy SiO2 and the crystallographical change from t-MoSi2 to h-Mo(Si,Al)2. Incorporation of fine SiC particles enabled to control microstructure and then to enhance mechanical properties.

Original languageEnglish
Pages (from-to)272-277
Number of pages6
JournalFuntai Oyobi Fummatsu Yakin/Journal of the Japan Society of Powder and Powder Metallurgy
Volume43
Issue number3
DOIs
Publication statusPublished - 1996 Mar

Keywords

  • AlO formation
  • Mechanical properties
  • Mo(Si,Al)
  • Mo-Si-Al/SiC composite
  • MoSi

ASJC Scopus subject areas

  • Mechanical Engineering
  • Industrial and Manufacturing Engineering
  • Metals and Alloys
  • Materials Chemistry

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