Microstructure and mechanical properties of the ZrC-added Mo-Si-B alloys prepared by arc-melting

Shunichi Nakayama, Kyosuke Yoshimi

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2 Citations (Scopus)


ZrC-added Mo-Si-B alloys were prepared by arc-melting. After heat-treatment at 1800°C for 24 h, their density and elastic moduli were measured, and their microstructure was evaluated. Moreover, high-temperature compression tests at 1400°C and four-point bending tests with a Chevron notch at room temperature were conducted to investigate their mechanical properties. The primary phase was Mo solid solution (Moss) or ZrC depending on Mo/ZrC compositional ratio. After the primary phase crystallization, Mo2B, Mo5SiB2(T2), Moss+ ZrC eutectic, Moss+ T2eutectic and/or Moss+ Mo3Si + T2eutectic were crystallized out during solidification. Mo2B and/or Mo3Si dissolved during the heat treatment in some alloys. The ZrC-added Mo-Si-B alloys had higher high-temperature strength compared with the ternary Mo-Si-B alloys even though ZrC-added Mo-Si-B alloys contained less volume fraction of the T2. Besides, the ZrC-added Mo-Si-B alloys exhibited better fracture toughness than that of ternary Mo-Si-B alloys, reaching 20.2 MPa(m)1/2. Therefore, this study found that ZrC plays a significant role in improving high-temperature strength and fracture toughness in Mo-Si-B alloys.

Original languageEnglish
Pages (from-to)92-101
Number of pages10
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Issue number1
Publication statusPublished - 2016


  • Density
  • High-temperature strength
  • Microstructure
  • Molybdenum
  • Molybdenum-silicon-boron alloys
  • Roomtemperature fracture toughness
  • Zirconium carbide


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