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Mechanical Behavior of Molybdenum Disilicide-Based Alloys

  • A. Misra (a1), A.A. Sharif (a1), J. J. Petrovic (a1) and T. E. Mitchell (a1)

Abstract

We have investigated the mechanical behavior of the following single-phase polycrystalline alloys with the MoSi2 body-center tetragonal structure: MoSi2 alloyed with ∼2.5 at.% Re, MoSi2 alloyed with 2 at.% Al, MoSi2 alloyed with 1 at.% Nb, and MoSi2 alloyed with 1 at.% Re and 2 at.% Al. Several anomalies in the mechanical behavior of alloyed materials were observed. For example, (i) addition of only ∼2.5 at. % Re results in an order of magnitude increase in compressive strength at 1600 °C, (ii) additions of Nb and Al cause solution softening at near-ambient temperatures, and (iii) quaternary MoSi2-Re-Al alloys show strengthening at elevated temperatures and reduction in flow stress with enhanced plasticity at near-ambient temperatures in compression. The mechanisms of anomalous solution hardening and softening are discussed.

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Mechanical Behavior of Molybdenum Disilicide-Based Alloys

  • A. Misra (a1), A.A. Sharif (a1), J. J. Petrovic (a1) and T. E. Mitchell (a1)

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