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Nanostructured Alloys Processed by Severe Straining Under High Pressure

Vladimir V. Stolyarov 

Institute of Physics of Advanced Materials, Ufa State Aviation Technical University, K.Marks St.12, Ufa 450000, Russian Federation


By now it is well established that severe plastic deformation (SPD),
i.e intense straining under high imposed pressure has an ability in
either strongly refine microstructure till up nanometer range and
change essentially a phase composition forming highly metastable
states in bulk samples of various alloys. Therefore, there is a
potential to achieve a new and extraordinay properties. However,
attaining such properties is complex problem, which depends on
different processing and microstructural parameters. This paper
focuses on SPD processing by severe torsion straining of several Ti,
Al and hard magnetic Pr2Fe14B based alloys. It is shown that for SPD
microstructures it is typical to have a presence of not only a very
small grain size, but also specific defect structures, high internal
stresses and often a formation of supersaturated solid solutions and
amorphyzation of intermetallics phases in these alloys. During further
heating ageing effects and reordening take place and processed alloys
demonstrate unique mechanical (strength and superplasticity) and
magnetic properties.


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Presentation: oral at High Pressure School 1999 (3rd), by Vladimir V. Stolyarov
See On-line Journal of High Pressure School 1999 (3rd)

Submitted: 2003-02-16 17:33
Revised:   2009-06-08 12:55