Stability of ultra-fine 'grain structures' produced by severe deformation.

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Abstract

A review. Severe deformation techniques allow metallic alloys to be deformed to ultra-high plastic strains, without any geometrical change to the work piece. They thus offer potential for the cheap prodn. of submicron grained materials, in a bulk form. After processing severely deformed materials do not have conventional, idealized, grain structures, contain significant fractions of low angle boundaries, and are often heterogeneous. Due to their high stored energy, they are unstable on annealing and in most cases can be thought of as continuously recrystg. However, locally discontinuous behaviors are often obsd., due to the retained less mobile low angle boundaries, as well as abnormal grain growth at elevated temps. Monte-Carlo-Potts models have been used to show the sensitivity of the annealing behavior to the initial starting structure present after deformation. The effect of coarse (.apprx. 1 mm) particles and fine dispersoid particles are also discussed. [on SciFinder (R)]

Keyword(s)

Extrusion of metals (equal channel angular pressing stability of ultra-fine grain structures produced by severe plastic deformation) Plastic deformation (severe stability of ultra-fine grain structures produced by severe plastic deformation) Annealing Grain growth Grain size Microstructure (stability of ultra-fine grain structures produced by severe plastic deformation) Alloys Metals Role: PEP (Physical, engineering or chemical process), PRP (Properties), PYP (Physical process), PROC (Process) (stability of ultra-fine grain structures produced by severe plastic deformation) Potential energy (stored stability of ultra-fine grain structures produced by severe plastic deformation) Recrystallization (texture stability of ultra-fine grain structures produced by severe plastic deformation)

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