Severe plastic deformation of metals

Abstract

This paper provides an introduction in the field of severe plastic deformation (SPD). First of all the main methods to produce SPD materials are discussed. In the following section, the mechanisms leading to the formation of fine grains are reviewed and the influence of changes in strain path is highlighted. During post-SPD thermal annealing, some typical microstructural changes take place. The influence of SPD and subsequent annealing on strength, ductility and superplastic properties are reviewed. Finally the paper provides a short overview of fatigue resistance and corrosion properties of those materials.

Formation of nanocrystalline β structure in metastable beta Ti alloy during high pressure torsion: The role played by stress induced martensitic transformation

“…Superior mechanical properties offered by ultrafine grained (UFG) materials such as high strength, good fatigue resistance and superplasticity at low temperatures [3] make SPD processes attractive. In particular, UFG titanium alloys have received considerable attention for potential aerospace and biomedical applications, including pure titanium [4][5][6][7] and a/b alloys [8,9].…”

Ultrahigh strength steel wires processed by severe plastic deformation for ultrafine grained microstructure

“…To provide an understanding for the case of steels, the experimentally determined process window for producing an ultrafine 2 Schematic of accumulative roll bonding 10 3 Typical EBSD microstructure in low carbon ferritic steel after six ARB cycles 21 Li and Virta Ultrahigh strength steel wires processed by SPD Materials Science and Technology 2011 VOL 27 NO 5 grain structure in Al-2Mg alloy is given in Fig. 4.…”

Mechanism of Superplastic Deformation of Alloy of the Zn-Cd-Mn System

“…• C andέ = 5 × 10 −1 s −1 , δ = 320% -start of neck formation [4]. Забелязва се блокиране на отделните дислокации от частиците на ζ-фазата.…”