Dynamic and static softening behaviors of aluminum alloys during multistage hot deformation

Zhang, Hui; Lin, Guo; Peng, Da; Yang, Lei; Lin, Qiquan

doi:10.1016/j.jmatprotec.2003.12.020

Cited by 61 publications

(15 citation statements)

References 15 publications

(16 reference statements)

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“…[41] The application of any of these methods to the current results is not straightforward, because stress-strain curves exhibit (1) a higher yield stress during initial loading than upon reloading and (2) an increase in the yield stress upon reloading with an increasing interruption time. These characteristics, which oppose conventional behavior reported for steel [31] and aluminum alloys, [32] could be attributable to a combination of experimental error and material flow characteristics. Observation (1) is due to a short transient prior to elastic deformation exhibited in stress-strain curves during initial loading, as shown in Figure 16, which has been previously attributed to friction effects.…”

Section: Fractional Softeningcontrasting

confidence: 72%

“…However, the technique is resource intensive (time and equipment) and requires highly specialized postprocessing routines. Another alternative employed previously for steel [31] and aluminum alloys [32] is the interrupted, or double-hit, compression test. Softening kinetics are determined through the softening observed in the yield strength upon reloading after load interruption.…”

Section: Introductionmentioning

confidence: 99%

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Recrystallization during Thermomechanical Processing of IMI834

Jahazi

Yue

2008

Metall Mater Trans A

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The microstructure development of the near-a titanium alloy IMI834 displaying an initial bimodal a + b microstructure has been characterized with respect to dynamic and static b recrystallization, through quantitative metallography. The investigation was supplemented by interrupted compression testing, to evaluate the applicability of fractional softening in the determination of static recrystallization kinetics for titanium alloys. Micrographs are presented that indicate that dynamic recrystallization occurred under test conditions (temperatures of 975°C, 1000°C, 1025°C, 1060°C, and 1100°C and strain rates of 0.01, 0.1, and 1 s -1 ), although complete grain refinement and homogeneity were only achieved following static recrystallization. Measurement obtained via image analysis revealed recrystallization kinetics that increased with temperature, for single-phase b predeformation microstructures (1060°C to 1100°C). However, bimodal a + b microstructures (1000°C to 1025°C) displayed more rapid recrystallization rates with decreasing temperature, which was attributed to a corresponding increase in a phase fraction. This increase yielded a more refined initial b grain size and an increase in favorable nucleation sites. In two-phase a + b microstructures (975°C) with secondary a in the b matrix, recrystallized grains could not be directly observed with optical microscopy. However, interrupted compression testing indicated that static recrystallization may be comparable to that observed at 1000°C. At all temperatures, an increasing strain rate accelerated recrystallization kinetics.

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Section: Fractional Softeningcontrasting

confidence: 72%

Section: Introductionmentioning

confidence: 99%

Recrystallization during Thermomechanical Processing of IMI834

Jahazi

Yue

2008

Metall Mater Trans A

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“…Flow softening is a common characteristic of true stress-true strain curves for many hot deformed alloys. Causes for this can be deformation heating and microstructural instabilities in the material, such as dynamic recrystallization, texture formation, dynamic precipitation, and precipitate dissolution [18]. The peak flow stresses measured for all temperature/strain rate combinations are summarized in Tables 3 and 4.…”

Section: Hot Compression Testsmentioning

confidence: 99%

Hot deformation of an Al–Cu–Mg powder metallurgy alloy

Mann

Hexemer²,

Donaldson³

et al. 2011

Materials Science and Engineering: A

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“…Softening mechanisms including static recovery, static recrystallization, and metadynamic recrystallization normally occur during inter-pass periods [25]. The degree of softening depend on the deformation temperature, strain rate, and holding time.…”

Section: Modeling the Kinetics Of Metadynamic Recrystallizationmentioning

confidence: 99%

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

Deng

Wang

Liu

2017

Metals

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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.

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Dynamic and static softening behaviors of aluminum alloys during multistage hot deformation

Cited by 61 publications

References 15 publications

Recrystallization during Thermomechanical Processing of IMI834

Recrystallization during Thermomechanical Processing of IMI834

Hot deformation of an Al–Cu–Mg powder metallurgy alloy

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

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