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Structural size effects of intermetallic compounds on the mechanical properties of Mo-Si-B alloy: An experimental investigation

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Abstract

In general, size, shape and dispersion of phases in alloys significantly affect mechanical properties. In this study, the mechanical properties of Mo-Si-B alloys were experimentally investigated with regards to the refinement of intermetallic compound. To confirm the size effect of the intermetallic compound phases on mechanical properties, two differently sized intermetallic compound powders consisting Mo5SiB2 and Mo3Si were fabricated by mechano-chemical process and high-energy ball milling. A modified powder metallurgy method was used with core-shell intermetallic powders where the intermetallic compound particles were the core and nano-sized Mo particles which formed by the hydrogen reduction of Mo oxide were the shells, leading to the microstructures with uniformly distributed intermetallic compound phases within a continuous α-Mo matrix phase. Vickers hardness and fracture toughness were measured to examine the mechanical properties of sintered bodies. Vickers hardness was 472 Hv for the fine intermetallic compound powder and 415 Hv for the coarse intermetallic compound powder. The fracture toughness was 12.4 MPa·√m for the fine IMC powders and 13.5 MPa·√m for the coarse intermetallic compound powder.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Hanyang University, Seoul, 04763, Republic of Korea

    Jong Min Byun, Su-Ryong Bang, Chun Woong Park & Young Do Kim

  2. Department of Materials and Metallurgical Engineering, Kangwon National University, Samcheok, 25913, Republic of Korea

    Myung-Jin Suk

Authors
  1. Jong Min Byun
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  2. Su-Ryong Bang
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  3. Chun Woong Park
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  4. Myung-Jin Suk
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  5. Young Do Kim
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Correspondence to Young Do Kim.

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Byun, J.M., Bang, SR., Park, C.W. et al. Structural size effects of intermetallic compounds on the mechanical properties of Mo-Si-B alloy: An experimental investigation. Met. Mater. Int. 22, 81–86 (2016). https://doi.org/10.1007/s12540-015-5497-0

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  • DOI: https://doi.org/10.1007/s12540-015-5497-0

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