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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.55  No.1 (2014)  >  pp.13-18

MATERIALS TRANSACTIONS
<<Previous article Vol.55  No.1 (2014)   pp.13 - 18 Next article>>

Superior Strength in Ultrafine-Grained Materials Produced by SPD Processing

Ruslan Z. Valiev1) 2)
1) Institute of Physics of Advanced Materials, Ufa State Aviation Technical University 2) Laboratory for Mechanics of Bulk Nanomaterials, Saint Petersburg State University, Universitetsky prospekt

Recent studies demonstrated that the processing of metallic alloys by severe plastic deformation (SPD) can result in not only strong grain refinement but also leads to the formation of grain boundaries (GBs) with different structures, including GB segregations and precipitations. These nanostructural features of SPD-processed alloys produce considerable influence on their mechanical properties. The paper presents experimental data demonstrating a superstrength and “positive” slope of the Hall–Petch relation when passing from micro- to nanostructured state in a number of metallic materials subjected to severe plastic deformation. The nature of the superior strength is associated with new strengthening mechanisms and the difficulty of generation of dislocations from grain boundaries with segregations.
This new approach is used for achieving the enhanced strength in several commercial Al and Ti alloys as well as steels subjected to SPD processing.


Keyword:
The Hall–Petch relation, severe plastic deformation (SPD), superstrength, nanostructured metals and alloys

Received: September 04, 2013
Accepted: October 16, 2013 , Published online: December 25, 2013
Copyright © 2013 The Japan Institute of Metals and Materials

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