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High-temperature deformation behavior of coarse- and fine-grained MoSi2 with different silica contents

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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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  1. R. Mitra (Scientist “E”, Assistant Professor)

    Present address: Defence Metallurgical Research Laboratory, India

Authors and Affiliations

  1. Department of Metallurgical and Materials Engineering, Indian Institute of Technology, 721 302, Kharagpur, West Bengal, India

    R. Mitra (Scientist “E”, Assistant Professor)

  2. the Defence Metallurgical Research Laboratory, 500 058, Hyderabad, India

    N. Eswara Prasad (Scientist “E”), Sweety Kumari (Scientist “B”) & A. Venugopal Rao (Scientist “D”)

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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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