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HomeMaterials Science ForumMaterials Science Forum Vols. 706-709Simulation of Hot Rolling Processing of an...

Simulation of Hot Rolling Processing of an Al-Cu-Mg Alloy by Torsion Tests

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Abstract:

Hot torsion tests to fracture to simulate thermomechanical processing were carried out on a solution-treated Al-Cu-Mg alloy (Al 2024-T351) at constant temperature. Torsion tests were conducted to failure in the range 270 to 470°C, between 2 and 26 s^-1. A peak ductility of the 2024 alloy was found at about 410°C. The high temperature data was analyzed by means of a Garofalo equation, obtaining a stress exponent of 6.1 and an activation energy for deformation of 180 kJ/mol. These high temperature deformation parameters correspond to an underlying deformation mechanism of constant substructure (n=8) but experiencing increasing microstructure coarsening with increasing temperature. The workability of the alloy was characterized by maximum energy efficiency and stability maps constructed from the torsion tests data to determine optimal conditions for the forming process, which depend on applied strain rate. A forming temperature of about 400°C is recommended.

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THERMEC 2011

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Periodical:

Materials Science Forum (Volumes 706-709)

Pages:

277-282

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.706-709.277

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Online since:

January 2012

Authors:

Fernando Carreno, Carmen Cepeda-Jimenez, Felix Peñalba, Manuel Carsí, Oscar Ruano

Keywords:

Aluminium Alloy, Efficiency Maps, Modeling, Thermomechanical Processing (TMP)

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© 2012 Trans Tech Publications Ltd. All Rights Reserved

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[19] J. Lasalle and L. Solomon: Stability by Lyapunov's Direct Method (Academic Press, New York, 1961). Fig. 1. Stress vs. strain curves for the Al 2024-T351 alloy deformed in torsion at ε=4. 5 s-1. Fig. 2. Zener parameter, Z = exp(Q/RT), as a function of sinh (ασ). Table I. Torsion tests to failure with m=0. 13 and θ=0. T0 (ºC) T0 (K) έ (s-1) G peak (Nm) s peak (MPa) e max 276 270 284 284 549 543 557 557.

[2] 1.

[4] 5.

[9] 6.

[25] 6.

[6] 4.

[6] 9.

[6] 8.

[6] 7 205 221 217 214.

[2] 9.

[2] 3.

[1] 3.

[1] 9 307 313 322 318 580 586 595 591.

[2] 1.

[4] 5.

[9] 6.

[25] 6.

[5] 7.

[6] 0.

[6] 0.

[6] 3 182 192 192 201.

[4] 6.

[3] 0.

[1] 9.

[1] 8 361 365 356 362 634 638 629 635.

[2] 1.

[4] 5.

[9] 6.

[25] 6.

[4] 1.

[4] 3.

[4] 7.

[5] 1 131 137 150 163.

[6] 4.

[4] 8.

[3] 3.

[2] 6 409 407 407 410 682 680 680 683.

[2] 1.

[4] 5.

[9] 6.

[25] 6.

[2] 9.

[3] 3.

[3] 6.

[4] 0 93 105 115 128.

[8] 3.

[5] 5.

[3] 5.

[2] 8 467 469 468 466 740 742 741 739.

[2] 1.

[4] 5.

[9] 6.

[25] 6.

[2] 2.

[2] 5.

[2] 8.

[3] 2 70 80 89 102.

[5] 1.

[3] 1.

[2] 8.

[2] 7 Fig. 3. Two-dimensional map of constant forming efficiency contours corresponding to a projection on a ε, T plane. Fig. 4. Two-dimensional representation of the 1st Lyapunov criterion as a function of strain rate and temperature. Fig. 5. Two-dimensional representation of the 2nd Lyapunov criterion as a function of strain rate and temperature.

DOI: 10.17816/kazmj90942-51576