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Metals 2017, 7(4), 107; doi:10.3390/met7040107

An Investigation on the Softening Mechanism of 5754 Aluminum Alloy during Multistage Hot Deformation

1,2,3,* , 1,3
,
1,2
and
1,2
1
State Key Laboratory of High-performance Complicated Manufacturing, Central South University, Changsha 410083, China
2
Light Alloy Research Institute, Central South University, Changsha 410083, China
3
School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China
*
Author to whom correspondence should be addressed.
Academic Editor: Hugo F. Lopez
Received: 12 January 2017 / Revised: 1 March 2017 / Accepted: 13 March 2017 / Published: 23 March 2017
View Full-Text   |   Download PDF [4557 KB, uploaded 24 March 2017]   |  

Abstract

Isothermal interrupted hot compression tests of 5754 aluminum were conducted on a Gleeble-3500 thermo-mechanical simulator at temperatures of 350 °C and 450 °C, and strain rates of 0.1 s−1 and 1 s−1. To investigate the metadynamic recrystallization behavior, a range of inter-pass delay times (5–60 s) was employed. These tests simulated flat rolling to investigate how softening behaviors respond to controlled parameters, such as deformation temperature, strain rate, and delay times. These data allowed the parameters for the hot rolling process to be optimized. The dynamic softening at each pass and the effect of metadynamic recrystallization on flow properties and microstructural evolution were analyzed in detail. An offset yield strength of 0.2% was employed to calculate the softening fraction undergoing metadynamic recrystallization. A kinetic model was developed to describe the metadynamic recrystallization behaviors of the hot-deformed 5754 aluminum alloy. Furthermore, the time constant for 50% recrystallization was expressed as functions related to the temperature and the strain rate. The experimental and calculated results were found to be in close agreement, which verified the developed model. View Full-Text
Keywords: 5754 aluminum alloy; two-pass hot compression; dynamic softening; metadynamic recrystallization 5754 aluminum alloy; two-pass hot compression; dynamic softening; metadynamic recrystallization
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MDPI and ACS Style

Huang, C.-Q.; Deng, J.; Wang, S.-X.; Liu, L.-L. An Investigation on the Softening Mechanism of 5754 Aluminum Alloy during Multistage Hot Deformation. Metals 2017, 7, 107.

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