Abstract:
15 years have passed since the pioneering publication of R.Z.Valiev and co-authors [1] who showed that plastic deformation under enhanced hydrostatic pressure can achieve nanostructures in bulk materials. While the first years have shown highlights in mechanical properties i.e. high strength paired with considerable ductility, as well as superplasticity at high deformation rates [2], recent research activities increasingly present outstanding SPD- functional nanomaterials [3]. Those exhibit advances in radiation damage resistance, electrical conductivity, hydrogen storage and especially thermoelectricity where even world records in both p- and n-type semiconductors were broken [4]. Very recent findings in SPD-processed magnetic and biodegradable nanomaterials prove that for functional properties low-dimensional SPD-induced lattice defects like dislocations and vacancy loops are more beneficial than high-dimensional ones like grain- or phase boundaries [4].
[1] R.Z. Valiev, I. Alexandrov, R. Islamgaliev, Bulk nanostructured materials from severe plastic deformation, Progr.Mater.Sci. 45, 103-189 (2000)
[2] M. Zehetbauer, Y.T. Zhu (eds.) Bulk nanostructured materials, 2009 WILEY-VCH Verlag GmbH & Co, Weinheim, Germany
[3] M. Zehetbauer, R. Groessinger, H. Krenn, M. Krystian, R. Pippan, P. Rogl, T. Waitz, R. Wuerschum, Bulk Nanostructured Functional Materials by Severe Plastic Deformation, Adv.Eng.Mater. 12, 692-700 (2010)
[4] R. Z. Valiev, Y. Estrin, Z. Horita, T. G. Langdon, M. J. Zehetbauer, Y. T. Zhu, Fundamentals of Superior Properties in Bulk NanoSPD Materials, Mater.Res.Lett. 4, 1-21 (2016)
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