Structure and Mechanical Properties of Nanostructured Metals Prepared by Severe Plastic Deformation
نویسنده
چکیده
Ultrafine-grained (UFG) nanostructured materials having grain sizes of tens and hundreds of nanometers recently have aroused interest among researchers in the materials science field. With respect to their mechanical properties, one would hope to be able to obtain the extremely strong states that can be expected in the case of strong grain refinement according to the Hall-Petch relationship (Gleiter 1989, Weertman 1993). UFG materials can also acquire superplasticity at relatively low temperatures and/or high strain rates by reducing the grain size of the materials to the nanometer range (Valiev 1997a). All this explains the interest in the mechanical properties processed in bulk samples having ultrafine-grain sizes.
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