Mechanical Behavior of Nanostructured Materials
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Mechanical Behavior of Nanostructured Materials Harriet Kung and Tim Foecke, Guest Editors Nanocrystalline materials have been attracting rapidly increasing interest in the last decade and have the potential of revolutionizing traditional materials design in many applications via atomic-level structural control to tailor the engineering properties. In addition to interesting physical properties in the areas of magnetics, catalysis, and optics, this class of materials exhibits a broad ränge of fascinating mechanical behavior. Superplastic deformation behavior has been observed at significantly lower temperatures in ceramic nanoscale powders. Ultrahigh hardnesses have been measured in nanoscale superlattices made of metallic and ceramic materials. Tensile and compressive strengths in nearly all material Systems studied have shown anomalously high values at the nanometer-length scale. The development of nanostructured materials is now raising the question of how the different properties change as the microstructural Scale is reduced to nanometer dimensions. Among potential applications of nanostructured materials, the design to achieve Optimum mechani cal properties is a common concern. Traditionally the mechanical strength
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