Abstract
Abstract The deformation behavior of single crystals of NbSi2 with the C40 structure has been investigated as a function of crystal orientation in the temperature range from room temperature to 1500°C in compression. Plastic flow is possible only when slip along 〈 1 2 10 〉 on (0001) is operative and no other slip systems are observed in the whole temperature range investigated. While plastic flow is observed above 500°C for as-grown crystals, the onset temperature for plastic flow is lowered by 300°C when the crystal is prestrained at 1400°C and then re-deformed at low temperatures. The critical resolved shear stress (CRSS) for basal slip decreases with increasing temperature but exhibits a moderate peak around 1300°C. In the temperature range where the anomaly in the CRSS is observed, the stress-strain curve is usually accompanied by serration. The deformation mechanism of NbSi2 is discussed in comparison with that reported for isostructural CrSi2.
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