Effects of initial microstructure and deformation method on grain refinement in a Cu-Cr-Zr alloy

Iaroslava Shakhova, Andrey Belyakov, Rustam Kaibyshev

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Citation (Scopus)

Abstract

The development of submicrocrystalline structure in a Cu-0.3wt.%Cr-0.5wt.%Zr during multidirectional forging (MDF) and equal channel angular pressing (ECAP) was investigated in comparison. A large number of strain-induced subboundaries with low-angle misorientations appeared at early deformation. The subsequent straining led to an increase in the misorientations of these subboundaries, resulting in the formation of submicrocrystalline structure at sufficiently large strains. The process of microstructural evolution can be considered as continuous dynamic recrystallization. MDF provided faster kinetics of new ultrafine grain formation as compared to ECAP. The fraction of ultrafine grains with a size below 2 μm comprised 0.59 or 0.23 after MDF or ECAP to a total strain of 4, respectively. The grain refinement kinetics could be accelerated by the presence of second phase precipitates. The fraction of ultrafine grains after MDF to a strain of 4 achieved 0.36 or 0.59 in the solution treated or aged samples, respectively.

Original languageEnglish
Title of host publicationSuperplasticity in Advanced Materials, ICSAM 2015
EditorsEiichi Sato, Goroh Itoh, Junya Kobayashi, Yoshimasa Takayama, Koichi Kitazono, Koji Morita, Takaomi Itoi
PublisherTrans Tech Publications Ltd
Pages308-313
Number of pages6
ISBN (Print)9783038356721
DOIs
Publication statusPublished - 2016
Externally publishedYes
Event12th International Conference on Superplasticity in Advanced Materials, ICSAM 2015 - Tokyo, Japan
Duration: 7 Sep 201511 Sep 2015

Publication series

NameMaterials Science Forum
Volume838-839
ISSN (Print)0255-5476
ISSN (Electronic)1662-9752

Conference

Conference12th International Conference on Superplasticity in Advanced Materials, ICSAM 2015
Country/TerritoryJapan
CityTokyo
Period7/09/1511/09/15

Keywords

  • Cu-Cr-Zr alloy
  • Dynamic recrystallization
  • ECAP
  • Multidirectional forging
  • Ultra-fine grained structure

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