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Though hard and superhard ceramic nanocrystalline thin films exhibit extraordinary strength, they typically suffer from brittleness. The lack of plasticity and associated toughness in these materials is due to brittle fracture along grain boundaries of a low cohesive energy, which is favored over dislocation emission. The catastrophic intergranular fracture of ceramic films is undesirable in many...
The search for simultaneously strong and tough materials requires the development of novel design strategies and synthesis routes. In this work, it is demonstrated that a nanoscale variation in material mechanical property distributions can serve as a universal concept for improvement of fracture behavior of nanostructured brittle thin films. Mechanical tests performed on microcantilever beam specimens...
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