Journal Published Online: 29 April 2021
Volume 10, Issue 2

Mo-Silicide Alloys for High-Temperature Structural Applications



The challenges of a high-temperature environment (T > 1,400°C) impose severe material performance constraints in terms of melting point, oxidation resistance, and structural functionality. A number of ceramic materials, intermetallic compounds, and refractory metals with high melting temperatures are available as material choices. However, in a single-component single-phase form, these materials do not satisfy all the aforementioned requirements. One clear message from the evolutionary development of high-temperature alloys is the importance of developing multicomponent alloys with multiphase microstructures and the capability to control phase fractions and morphologies to satisfy a number of mechanical property requirements. Besides the essential structural requirements, elevated temperatures often also involve aggressive environments that require a material to display an inherent oxidation protection that can be further enhanced by coating. Among the leading candidates to advance beyond the capability of the current nickel (Ni)-base superalloys, the multiphase microstructures that can be developed in the molybdenum-silicon-boron (Mo-Si-B) system involving a high melting temperature (>2,100°C) ternary-based intermetallic Mo5SiB2 (T2) offer an attractive performance. Most of the attention has been on three-phase alloys comprised of Mo(ss), T2, and Mo3Si that offer high-temperature stability and robust microstructures, but new alloy designs are in development. In this review the recent advances in the development of Mo-silicide alloys are discussed in terms of alloy design, microstructure control, structural performance, environmental resistance, and component analysis.

Author Information

Perepezko, J. H.
Department of Materials Science and Engineering, University of Wisconsin-Madison, Madison, WI, USA
Krüger, M.
Institute of Materials and Joining Technology (IWF), Otto-von-Guericke University Magdeburg, Magdeburg, Germany
Heilmaier, M.
Institut für Angewandte Materialien – Werkstoffkunde (IAM-WK), Karlsruhe Institut für Technologie (KIT), Karlsruhe, Germany
Pages: 24
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Stock #: MPC20200183
ISSN: 2379-1365
DOI: 10.1520/MPC20200183