Effect of reloading on dynamic recrystallization in shock deformed aluminum alloy

Svetlana Atroshenko, Aleksandr Divakov, Yuri Meshcheyakov, Natalia Naumova

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

3 Scopus citations

Abstract

In order to verify influence of particle velocity non-uniformity on dynamic recrystallization (DRX), shock tests of D16 Al alloy were conducted under uniaxial strain conditions within strain-rate range of 105 ÷ 107 s-1. The particle velocity non-uniformity arises due to both initial heterogeneity and non-linearity of shock-wave process. Apart from the nature of DRX mechanism, migrational or rotational, the particle velocity non-uniformity facilitates growth of local strain, strain rate and temperature. To adjust a duration of the particle velocity non-uniformity degree, two limiting situations is provided by means of single and double shock loading (reloading). The experimental technique used allows to register both mean particle velocity profile and particle velocity variation which is the quantitative characteristic of velocity non-uniformity. Shock tests of D16 Al alloy in single and reloading regimes [1] show that dynamic recrystallization takes place only in the second case. The reloading regime initiates a ten-fold increase in duration of the particle velocity non-uniformity stage, which is sufficient for fulfillment of the well-known DRX conditions: γ ≥ 3, dγ/dt ≥ 104 s-1, T ≥ 0.4Tm. The regions of DRX with equal-axis grains of ~1 μm in diameter are revealed with the metallography and X-ray analysis.

Original languageEnglish
Title of host publicationAluminium Alloys, ICAA 2014
EditorsKnut Marthinsen, Bjørn Holmedal, Yanjun Li
PublisherTrans Tech Publications Ltd
Pages755-760
Number of pages6
ISBN (Print)9783038351207
DOIs
StatePublished - 2014
Event14th International Conference on Aluminium Alloys, ICAA 2014 - Trondheim, Norway
Duration: 15 Jun 201419 Jun 2014

Publication series

NameMaterials Science Forum
Volume794-796
ISSN (Print)0255-5476
ISSN (Electronic)1662-9752

Conference

Conference14th International Conference on Aluminium Alloys, ICAA 2014
CountryNorway
CityTrondheim
Period15/06/1419/06/14

Scopus subject areas

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

Keywords

  • D16 Al alloy
  • Dynamic recrystallization (DRX)
  • Particle velocity profile and particle velocity variation
  • Single and double shock loading (reloading)

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