On the serrated yielding in AlMg6.5 alloy sheet
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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.
Кључне речи:
AlMg alloy / serrated yielding / diffusion / activation energy / deformation behaviourИзвор:
Journal of the Serbian Chemical Society, 1998, 63, 10, 823-832Издавач:
- Serbian Chemical Society, Belgrade
Институција/група
Tehnološko-metalurški fakultetTY - 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 .