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Annealing treatments to enhance thermal and mechanical stability of ultrafine-grained metals produced by severe plastic deformation

  • H. Mughrabi EMAIL logo , H. W. Höppel , M. Kautz and R. Z. Valiev
Published/Copyright: February 7, 2022
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 94 Issue 10

Abstract

Ultrafine-grained (UFG) metals produced by techniques of severe plastic deformation, such as equal channel angular pressing (ECAP), exhibit extraordinary strength properties. However, in the as-ECAP-processed state, the heavily deformed microstructure of such UFG metals is rather unstable and is prone to undergo grain coarsening (recrystallization) at moderate temperatures. This microstructural instability is enhanced in the presence of modest mechanical stressing as, for example, in cyclic deformation. Thus, all measures to enhance the thermal stability are also considered as beneficial for the improvement of the mechanical stability.

One main objective of the present work is to analyse the thermal and mechanical stability of ECAP-processed metals during specific annealing and cyclic deformation tests. As a by-product, some conclusions relating to the separate effects of dislocation density, grain size (in the UFG regime) and internal stresses on the (micro)yielding behaviour will be drawn. Another goal is to explore the potential of different annealing treatments with respect to the stabilization of the microstructure and the optimization of the mechanical properties of ECAP-processed UFG metals in terms of an optimal combination of strength and ductility. In order to demonstrate the potential and the limitations of this approach, experimental work performed on UFG copper, aluminium and α-brass produced by ECAP will be reported and discussed. The results presented indicate strongly that a heat treatment leading to a bimodal grain size distribution provides the best compromise between strength and ductility.

Keywords: Ultrafine-grained metals; microstructural stability; low-cycle fatigue; recovery/recrystallization; annealing; strength; ductility

Dedicated to Professor Dr. Dr. h. c. Herbert Gleiter on the occasion of his 65th birthday

Prof. Dr. H. Mughrabi Martensstrasse 5, D-91058 Erlangen, Germany Tel.: +49 9131 8527 482 Fax: +49 9131 8527 504

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Received: 2003-05-14
Published Online: 2022-02-07

© 2003 Carl Hanser Verlag, München

Articles in the same Issue

  1. Frontmatter
  2. Articles/Aufsätze
  3. From atomistics to macro-behavior: structural superplasticity in micro- and nano-crystalline materials
  4. Interface stress in nanocrystalline materials
  5. Microstructure, frequency and localisation of pseudo-elastic fatigue strain in NiTi
  6. Intercrystalline defects and some properties of electrodeposited nanocrystalline nickel and its alloys
  7. Positrons as chemically sensitive probes in interfaces of multicomponent complex materials: Nanocrystalline Fe90Zr7B3
  8. Annealing treatments to enhance thermal and mechanical stability of ultrafine-grained metals produced by severe plastic deformation
  9. Nanoceramics by chemical vapour synthesis
  10. Deformation mechanism and inverse Hall – Petch behavior in nanocrystalline materials
  11. Simulations of the inert gas condensation processes
  12. Unconventional deformation mechanism in nanocrystalline metals?
  13. Alloying reactions in nanostructured multilayers during intense deformation
  14. Impact of grain boundary character on grain boundary kinetics
  15. Nanostructured (CoxFe1– x)3–yO4 spinel – mechanochemical synthesis
  16. Nanostructure formation and thermal stability of nanophase materials prepared by mechanical means
  17. Low-temperature plasma nitriding of AISI 304 stainless steel with nano-structured surface layer
  18. New materials from non-intuitive composite effects
  19. On the line defects associated with grain boundary junctions
  20. Young’s modulus in nanostructured metals
  21. The kinetics of phase formation in an ultra-thin nanoscale layer
  22. Notifications/Mitteilungen
  23. Personal/Personelles
  24. News
  25. DGM Events
https://doi.org/10.1515/ijmr-2003-0197
Keywords for this article
Ultrafine-grained metals; microstructural stability; low-cycle fatigue; recovery/recrystallization; annealing; strength; ductility

Articles in the same Issue

  1. Frontmatter
  2. Articles/Aufsätze
  3. From atomistics to macro-behavior: structural superplasticity in micro- and nano-crystalline materials
  4. Interface stress in nanocrystalline materials
  5. Microstructure, frequency and localisation of pseudo-elastic fatigue strain in NiTi
  6. Intercrystalline defects and some properties of electrodeposited nanocrystalline nickel and its alloys
  7. Positrons as chemically sensitive probes in interfaces of multicomponent complex materials: Nanocrystalline Fe90Zr7B3
  8. Annealing treatments to enhance thermal and mechanical stability of ultrafine-grained metals produced by severe plastic deformation
  9. Nanoceramics by chemical vapour synthesis
  10. Deformation mechanism and inverse Hall – Petch behavior in nanocrystalline materials
  11. Simulations of the inert gas condensation processes
  12. Unconventional deformation mechanism in nanocrystalline metals?
  13. Alloying reactions in nanostructured multilayers during intense deformation
  14. Impact of grain boundary character on grain boundary kinetics
  15. Nanostructured (CoxFe1– x)3–yO4 spinel – mechanochemical synthesis
  16. Nanostructure formation and thermal stability of nanophase materials prepared by mechanical means
  17. Low-temperature plasma nitriding of AISI 304 stainless steel with nano-structured surface layer
  18. New materials from non-intuitive composite effects
  19. On the line defects associated with grain boundary junctions
  20. Young’s modulus in nanostructured metals
  21. The kinetics of phase formation in an ultra-thin nanoscale layer
  22. Notifications/Mitteilungen
  23. Personal/Personelles
  24. News
  25. DGM Events
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