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On the serrated yielding in AlMg6.5 alloy sheet

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1998
JSCS1998-Serratedflow.pdf (5.492Mb)
Authors
Romhanji, Endre
Popović, Miljana
Radmilović, V.
Article (Published version)
Metadata
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Abstract
Room temperature tensile tests were performed on AlMg6.5 alloy sheet, with Initial strain rates of 6.7x10(4) s(1), 6.7x10(-3) s(-1) and 6.7x10(-2) s(-1), after imposing 70% cold rolling reductions, and annealing at 320 degrees C/3 h. The Portevin-Le Chatelier effect is the main mechanism of unstable plastic flow, caused by Mg solute-dislocation interactions. Although, a comprehensive comparison of the energies of activation, relevant for serrated yielding, revealed a wide range of values, calculations based on the used strain rates, retained vacancy concentration and the Mg solute diffusion coefficient at room temperature, indicate that serrations are expected to appear from the start of plastic deformation. In other wolds, under the performed test conditions, the Mg solute atoms are mobile enough for the majority of dislocations to travel in conjunction with the Mg atmospheres. After deformation at a strain rate of 6.7x10(-2) s(-1) the "D" type serration observed, as a series of succe...ssive not completely flat stress plateaus, indicates a complex deformation process, affected by strain hardening, coused by dislocation reactions and the propagation of a kind of non-hardening deformation bands.

Keywords:
AlMg alloy / serrated yielding / diffusion / activation energy / deformation behaviour
Source:
Journal of the Serbian Chemical Society, 1998, 63, 10, 823-832
Publisher:
  • Serbian Chemical Society, Belgrade

ISSN: 0352-5139

PubMed:

WoS: 000076247200008

Scopus: 2-s2.0-0032278754
[ Google Scholar ]
Handle
https://hdl.handle.net/21.15107/rcub_technorep_170
URI
http://TechnoRep.tmf.bg.ac.rs/handle/123456789/170
Collections
  • Radovi istraživača / Researchers’ publications (TMF)
Institution/Community
Tehnološko-metalurški fakultet
TY  - JOUR
AU  - Romhanji, Endre
AU  - Popović, Miljana
AU  - Radmilović, V.
PY  - 1998
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/170
AB  - Room temperature tensile tests were performed on AlMg6.5 alloy sheet, with Initial strain rates of 6.7x10(4) s(1), 6.7x10(-3) s(-1) and 6.7x10(-2) s(-1), after imposing 70% cold rolling reductions, and annealing at 320 degrees C/3 h. The Portevin-Le Chatelier effect is the main mechanism of unstable plastic flow, caused by Mg solute-dislocation interactions. Although, a comprehensive comparison of the energies of activation, relevant for serrated yielding, revealed a wide range of values, calculations based on the used strain rates, retained vacancy concentration and the Mg solute diffusion coefficient at room temperature, indicate that serrations are expected to appear from the start of plastic deformation. In other wolds, under the performed test conditions, the Mg solute atoms are mobile enough for the majority of dislocations to travel in conjunction with the Mg atmospheres. After deformation at a strain rate of 6.7x10(-2) s(-1) the "D" type serration observed, as a series of successive not completely flat stress plateaus, indicates a complex deformation process, affected by strain hardening, coused by dislocation reactions and the propagation of a kind of non-hardening deformation bands.
PB  - Serbian Chemical Society, Belgrade
T2  - Journal of the Serbian Chemical Society
T1  - On the serrated yielding in AlMg6.5 alloy sheet
EP  - 832
IS  - 10
SP  - 823
VL  - 63
UR  - https://hdl.handle.net/21.15107/rcub_technorep_170
ER  - 
@article{
author = "Romhanji, Endre and Popović, Miljana and Radmilović, V.",
year = "1998",
abstract = "Room temperature tensile tests were performed on AlMg6.5 alloy sheet, with Initial strain rates of 6.7x10(4) s(1), 6.7x10(-3) s(-1) and 6.7x10(-2) s(-1), after imposing 70% cold rolling reductions, and annealing at 320 degrees C/3 h. The Portevin-Le Chatelier effect is the main mechanism of unstable plastic flow, caused by Mg solute-dislocation interactions. Although, a comprehensive comparison of the energies of activation, relevant for serrated yielding, revealed a wide range of values, calculations based on the used strain rates, retained vacancy concentration and the Mg solute diffusion coefficient at room temperature, indicate that serrations are expected to appear from the start of plastic deformation. In other wolds, under the performed test conditions, the Mg solute atoms are mobile enough for the majority of dislocations to travel in conjunction with the Mg atmospheres. After deformation at a strain rate of 6.7x10(-2) s(-1) the "D" type serration observed, as a series of successive not completely flat stress plateaus, indicates a complex deformation process, affected by strain hardening, coused by dislocation reactions and the propagation of a kind of non-hardening deformation bands.",
publisher = "Serbian Chemical Society, Belgrade",
journal = "Journal of the Serbian Chemical Society",
title = "On the serrated yielding in AlMg6.5 alloy sheet",
pages = "832-823",
number = "10",
volume = "63",
url = "https://hdl.handle.net/21.15107/rcub_technorep_170"
}
Romhanji, E., Popović, M.,& Radmilović, V.. (1998). On the serrated yielding in AlMg6.5 alloy sheet. in Journal of the Serbian Chemical Society
Serbian Chemical Society, Belgrade., 63(10), 823-832.
https://hdl.handle.net/21.15107/rcub_technorep_170
Romhanji E, Popović M, Radmilović V. On the serrated yielding in AlMg6.5 alloy sheet. in Journal of the Serbian Chemical Society. 1998;63(10):823-832.
https://hdl.handle.net/21.15107/rcub_technorep_170 .
Romhanji, Endre, Popović, Miljana, Radmilović, V., "On the serrated yielding in AlMg6.5 alloy sheet" in Journal of the Serbian Chemical Society, 63, no. 10 (1998):823-832,
https://hdl.handle.net/21.15107/rcub_technorep_170 .

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