2004 | OriginalPaper | Chapter
Localization of Plastic Flow in Nanocrystalline Materials
Authors : Dr. Mikhail Yu. Gutkin, Prof. Ilya A. Ovid’ko
Published in: Plastic Deformation in Nanocrystalline Materials
Publisher: Springer Berlin Heidelberg
Included in: Professional Book Archive
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In general, plastic deformation in NCMs can be spatially homogeneous or localized in narrow shear bands. Evidence of plastic flow localization has been observed in NCMs tested in tension [244], compression [257], fatigue [323], and microhardness [324, 325]. For instance, during microhardness testing, nanostructured TiB2 films have exhibited plastic flow which has been realized in either the homogeneous or inhomogeneous regime [324, 325]. In the latter case, their plastic behaviour has been very similar to the well-known phenomena of superplasticity which is quite common for fine-grained metals, intermetallics and ceramics under certain specific temperature and strain rate conditions [326–332]. The effect of superplasticity in NCMs has also been detected experimentally [227, 228, 333–338]. It has been well established [326–332] that grain boundary sliding is mainly responsible for the superplasticity.