Abstract
MoSi 2 single crystals in the soft 〈201〉 orientation and polycrystals were deformed in constant strain rate tests in compression between 300 and 1200°C for single crystals, and between 495 and 1250°C for polycrystals. Stress relaxation and temperature change tests were performed to determine the activation parameters of the deformation. In addition to conventional transmission electron microscopy in a high-voltage electron microscope, in situ straining experiments were carried out in this instrument to observe the deformation processes directly. A new model is proposed to interpret the flow stress anomaly in MoSi 2 single crystals. In polycrystals, the deformation is controlled by dislocation glide below about 1050°C, however, by decohesion of a grain boundary phase above this temperature.
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