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A grain boundary sliding creep mechanism, accommodated by “mantle” dislocation activities, is shown to allow for large strain (ε>0.08) during the creep of a ZrB2–20% SiC composite at 1800°C. We characterized the local grain deformation behavior using high-resolution electron backscatter diffraction microscopy and an indentation deformation mapping technique. Deformation gradients near grain boundaries...
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