TY - GEN

T1 - Effect of reloading on dynamic recrystallization in shock deformed aluminum alloy

AU - Atroshenko, Svetlana

AU - Divakov, Aleksandr

AU - Meshcheyakov, Yuri

AU - Naumova, Natalia

N1 - Copyright: Copyright 2020 Elsevier B.V., All rights reserved.

PY - 2014

Y1 - 2014

N2 - 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.

AB - 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.

KW - D16 Al alloy

KW - Dynamic recrystallization (DRX)

KW - Particle velocity profile and particle velocity variation

KW - Single and double shock loading (reloading)

UR - http://www.scopus.com/inward/record.url?scp=84904400281&partnerID=8YFLogxK

U2 - 10.4028/www.scientific.net/MSF.794-796.755

DO - 10.4028/www.scientific.net/MSF.794-796.755

M3 - Conference contribution

AN - SCOPUS:84904400281

SN - 9783038351207

T3 - Materials Science Forum

SP - 755

EP - 760

BT - Aluminium Alloys, ICAA 2014

A2 - Marthinsen, Knut

A2 - Holmedal, Bjørn

A2 - Li, Yanjun

PB - Trans Tech Publications Ltd

T2 - 14th International Conference on Aluminium Alloys, ICAA 2014

Y2 - 15 June 2014 through 19 June 2014

ER -