severe plastic deformation
(rus. интенсивная пластическая деформация abbr., ИПД)
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method of producing porous metals and alloys with grain sizes of ca. 100 nm that consists in formation highly fragmented and disoriented structure by means of large strains; the resulting structure retains residual signs of recrystallised amorphous state.
Description
SPD is applicable mainly to plastically deformable materials. The large strains are achieved through torsion under quasi-hydrostatic pressure, equal channel angular pressing, rolling, and comprehensive forging. The essence of these methods consists in repeated severe plastic shear deformation of the processed materials. The severe plastic deformation, along with decreasing the mean grain size, allows one to obtain massive samples with a virtually non-porous structure of the material, which is not achievable by the compaction of nanopowders.
Author
- Gusev Alexander I.
Sources
- Gusev A. I. Nanomaterials, Nanostructures, and Nanotechnologies (in Russian) // Fizmatlit, Moscow (2007) - 416 pp.
- Valiev R. Z., Aleksandrov I. V. Nanostructured materials produced by severe plastic deformation (in Russian). — Moscow: Logos, 2000. — 272 p.
- Segal V.M., Reznikov V.I., Kopylov V.I. et al. The processes of structure formation of plastic metals (in Russian). — Minsk: Nauka i tekhnika, 1994. — 232 p.