Abstract
Silicon carbide is, like many other candidate ceramics for high temperature applications, brittle when tested macroscopically. However, little is known about its deformation at a microscopic scale. This contribution reports the observation of limited plasticity and microscopic cracking produced during fracture of silicon carbide.The material used in this work was a dense sub-micron grain size silicon carbide produced by hot pressing with the addition of a small quantity of boron. Disc specimens suitable for examination in a Philips EM 301 microscope were prepared by mechanical grinding and subsequent ion thinning. Deformation was then introduced by the simple expedient of breaking the specimen after mounting it on an electron microscope grid. The material has the cubic structure (β).
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