Effect of processing temperature on microstructure development during ECAP of Al-Mg-Sc alloy

O. Sitdikov, E. Avtokratova, T. Sakai, K. Tsuzaki, R. Kaibyshev, Y. Watanabe

Research output: Chapter in Book/Report/Conference proceedingConference contribution

8 Citations (Scopus)

Abstract

Microstructural evolution taking place during equal channel angular pressing (ECAP) was studied in a commercial coarse-grained Al-6%Mg-0.4%Mn-0.3%Sc alloy in a temperature interval 200-450°C (∼0.5-0.8 Tm). Samples were pressed using route A to a total strain of 12 and quenched in water after each ECAP pass. Uniform fine-grained microstructures with the average grain sizes of 0.7 and 2.5 μm, are almost fully evolved at high ECAP strains at 250°C and 450°C, respectively, while ECAP at 300°C (∼0.6 Tm) leads to the formation of bimodal grain structure with fine grains of around 1 μm and relatively coarse grains of around 8 μm. The latter are developed due to the occurrence of static recrystallization during "keeping" time in the ECAP channel and/or reheating between ECAP passes. The microstructural development under warm-to-hot ECAP conditions is discussed in terms of the large potential for grain boundary migration resulted from an overlapping of accelerated grain boundary mobility at high pressing temperatures and enhanced driving force for recrystallization, which is caused by a strong inhibition of dynamic recovery in a heavily-alloyed Al alloy.

Original languageEnglish
Title of host publicationMaterials Science Forum - Nanomaterials by Severe Plastic Deformation 4 - 4th International Conference on Nanomaterials by Severe Plastic Deformation
EditorsYuri Estrin, Yuri Estrin, Hans Jurgen Maier
PublisherTrans Tech Publications Ltd
Pages481-486
Number of pages6
ISBN (Electronic)978-0-87849-360-9
DOIs
Publication statusPublished - 2008
Externally publishedYes
Event4th International Conference on Nanomaterials by Severe Plastic Deformation - Goslar, Germany
Duration: Aug 18 2008Aug 22 2008

Publication series

NameMaterials Science Forum
Volume584-586 PART 1
ISSN (Print)0255-5476
ISSN (Electronic)1662-9752

Other

Other4th International Conference on Nanomaterials by Severe Plastic Deformation
CountryGermany
CityGoslar
Period8/18/088/22/08

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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