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High Temperature Materials and Processes

Editor-in-Chief: Fukuyama, Hiroyuki

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Volume 31, Issue 4-5 (Oct 2012)

Issues

Effective Temperature of High Pressure Torsion in Zr-Nb Alloys

Boris B. Straumal
  • Corresponding author
  • Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka
  • Karlsruher Institut für Technologie, Institut für Nanotechnologie, Eggenstein-Leopoldshafen
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/ Alena S. Gornakova / Olga B. Fabrichnaya / Mario J. Kriegel / Andrey A. Mazilkin
  • Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka
  • Karlsruher Institut für Technologie, Institut für Nanotechnologie, Eggenstein-Leopoldshafen
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ B. Baretzky / A. M. Gusak / S. V. Dobatkin
  • A. A. Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences, Moscow
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Published Online: 2012-11-23 | DOI: https://doi.org/10.1515/htmp-2012-0057

Abstract

Severe plastic deformation by the high pressure torsion (HPT) leads to the phase transitions and strong grain refinement. The starting α Zr-phase in Zr alloyed by 2.5 and 8 mass% Nb transforms into β + ω mixture. This β + ω phase mixture can be found in the equilibrium phase diagram at higher (effective) temperature (Teff = 620°C for Zr-2.5 mass% Nb and (Teff = 550°C for Zr-8 mass% Nb). The published papers on phase transitions during HPT are analysed and the values of effective temperature are estimated. Contrary to the increasing temperature, the increasing pressure slows down the diffusion and grain boundary migration. Therefore, the forced atomic movement during HPT produces the states equivalent to higher temperature, but not to the higher pressure.

Keywords: Nanocrystalline materials; high pressure torsion; phase transitions; Zr-Nb alloys

About the article

Institute of Solid State Physics, Russian Academy of Sciences, Ac. Ossipyan str. 2, Chernogolovka, 142432, Russia

Karlsruher Institut für Technologie, Institut für Nanotechnologie, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany


Received: 2012-06-03

Accepted: 2012-06-16

Published Online: 2012-11-23

Published in Print: 2012-10-30


Citation Information: , ISSN (Online) 2191-0324, ISSN (Print) 0334-6455, DOI: https://doi.org/10.1515/htmp-2012-0057.

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©[2012] by Walter de Gruyter Berlin Boston. Copyright Clearance Center

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