Abstract
The elevated-temperature deformation behavior of polycrystalline molybdenum disilicide (MoSi2), in the range of 1000 °C to 1350 °C at the strain rates of 10−3, 5×10−4, or 10−4 s−1, has been studied. The yield strength, post-yield flow behavior comprising strain hardening and serrations, as well as some of the deformation microstructures of reaction-hot-pressed (RHP) MoSi2 samples, processed by hot pressing an elemental Mo + Si powder mixture and having a grain size of 5 µm and oxygen content of 0.06 wt pct, have been compared with those of samples prepared by hot pressing of commercial-grade Starck MoSi2 powder, with a grain size of 27 µm and oxygen content of 0.89 wt pct. While the fine-grained RHP MoSi2 samples have shown higher yield strength at relatively lower temperatures and higher strain rates, the coarse-grained Starck MoSi2 has a higher yield at decreasing strain rates and higher temperatures. The work-hardening or softening characteristics are dependent on grain size, temperature, and strain rate. Enhanced dislocation activity and dynamic recovery, accomplished by arrangement of dislocations in low-angle boundaries, characterize the deformation behavior of fine-grained RHP MoSi2 at a temperature of 1200 °C and above and are responsible for increased uniform plastic strain with increasing temperature. The silica content appears to be less effective in degrading the high-temperature yield strength if the grain size is coarse, but leads to plastic-flow localization and strain softening in Starck MoSi2. Serrated plastic flow has also been observed in a large number of samples, mostly when deformed at specific combinations of strain rates and temperatures.
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Mitra, R., Prasad, N.E., Kumari, S. et al. High-temperature deformation behavior of coarse- and fine-grained MoSi2 with different silica contents. Metall Mater Trans A 34, 1069–1088 (2003). https://doi.org/10.1007/s11661-003-0127-8
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DOI: https://doi.org/10.1007/s11661-003-0127-8