A Physically Based Constitutive Model and Continuous Dynamic Recrystallization Behavior Analysis of 2219 Aluminum Alloy during Hot Deformation Process

Liu, Lei; Wu, Yunxin; Gong, Hai; Li, Shuang; Ahmad, Abdulrahaman Shuaibu

doi:10.3390/ma11081443

Cited by 34 publications

(19 citation statements)

References 53 publications

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“…The 2219 Al alloy has been used for manufacturing various aerospace components (i.e., oxidizer and fuel tanks) attributable to its high strength, high fracture toughness, and reliable weldability [1,2]. The quality and performance of the large-sized ingots are very important in the realization of performance (high strength, lightweight, stress-corrosion resistance, and stability) and the technical target in large-scale aerospace components [3].…”

Section: Introductionmentioning

confidence: 99%

Possible Effects and Mechanisms of Ultrasonic Cavitation on Oxide Inclusions during Direct-Chill Casting of an Al Alloy

Zhang

et al. 2018

Metals

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Oxide films or inclusions can reduce the continuity and integrity of materials and they always lead to a significant reduction in the mechanical properties of an aluminum alloy. They can greatly reduce the plastic flow behavior of materials, thus affecting the subsequent processing performance. Therefore, an effective ultrasonic assisted preparation technology has been applied to industrial manufacturing of large-scale aluminum alloy ingots (with diameter: Φ = 1250 mm and height: h = 3750 mm). However, the mechanisms of ultrasonic purification on the large-scale ingots are not clear. Therefore, a number of aluminum alloy casting experiments were carried out to produce a conventional hot top semi-continuous ingot (CHTI) and an ultrasonic hot top semi-continuous ingot (UHTI) in this work. The microstructures of CHTI and UHTI were analyzed by optical microscopy (OM) and scanning electron microscopy (SEM). The results indicated that there were some oxide film defects in the CHTI but some finely dispersed inclusion particles were discovered in the UHTI. The X-ray diffraction (XRD) data showed that the component of inclusion was Al2O3. According to the different cavitation effects of the different areas of the molten aluminum, the process of ultrasonic purification was divided into three periods and the mechanisms in each period were separately studied.

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Section: Introductionmentioning

confidence: 99%

Possible Effects and Mechanisms of Ultrasonic Cavitation on Oxide Inclusions during Direct-Chill Casting of an Al Alloy

Zhang

et al. 2018

Metals

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“…Moreover, the flow curve showed a trend of gradually decreasing in each pass. According to the previous study of the author [ 31 ], this was because of the occurrence of the continuous dynamic recrystallization (CDRX) of the Al 2219 alloy, where the LAGBs gradually accumulated into the HAGBs, and the average dislocation density gradually decreased [ 32 ]. Furthermore, the step phenomenon was obvious between the two compression passes.…”

Section: Resultsmentioning

confidence: 99%

Static Softening Behavior and Modified Kinetics of Al 2219 Alloy Based on a Double-Pass Hot Compression Test

Liu

Gong

et al. 2020

Materials

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In this paper, the static softening mechanism of a 2219 aluminum alloy was studied based on a double-pass isothermal compression test. For the experiment, different temperatures (623 K, 723 K, and 773 K), strain rates (0.1/s, 1/s, and 10/s), deformation ratios (20%, 30%, and 40%), and insulation periods (5 s, 30 s, and 60 s) were used. Based on the double-pass flow stress curves obtained from the experiment, the step rate expressed by the equivalent dynamic recrystallization fraction is dependent on the deformation parameters, which increases with the increase in strain rate and insulation time, while it decreases with the increase in temperature and strain. Based on the microstructure observed using electron backscattered diffraction (EBSD), the static softening mechanism of the Al 2219 alloy is mainly static recovery and incomplete static recrystallization. A new expression for the static recrystallization fraction is proposed using the reduction rate of the sub-grain boundary. The dependent rule on the deformation parameters is consistent with the step rate, but it is of physical significance. In addition, the modified static recrystallization kinetics established by the new SRX fraction method was proven to have a good modeling and prediction performance under given deformation conditions.

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“…The key difference between CDRX and GDRX, however, is the evolution of the LAGB misorientations. During GDRX, these firstly increase and then plateau at a steady value, whereas during CDRX they continuously increase until they reach the threshold value at which the boundaries are considered to be HAGB [58,60]. The key difference between DDRX and GDRX is the shape of the original grains.…”

Section: Dynamic Recrystallisation Mechanisms and Conditions Of Occurmentioning

confidence: 99%

“…A summary of recrystallisation types under different thermomechanical conditions for (a) as-fabricated[35,37,53], (b) quenched and naturally aged[11,34,44,60], (c) as-homogenised 7xxx and T6-6xxx alloys[29,32,33]. Note: solid symbols represent torsion tests, while hollow and cross symbols represent compression tests.…”

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confidence: 99%

A Review of Microstructural Evolution and Modelling of Aluminium Alloys under Hot Forming Conditions

Zheng

Yardley

et al. 2020

Metals

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Microstructural evolution during hot forming of aluminium alloys plays a critical role in both the material flow behaviour during the deformation and the post-form mechanical properties in service. This paper presents a comprehensive review on the recrystallisation mechanisms, the interrelations between microstructures and macroscopic responses, and the associated modelling methods for aluminium alloys under hot forming conditions. Particular attention is focused on dynamic recrystallisation (DRX), which occurs during hot forming. The mechanisms, key features, and conditions of occurrence (forming temperature, strain rates, etc.) during hot forming for each type of DRX type are classified. The relationships between microstructures and macroscopic responses, including the flow behaviour, the post-form strength and ductility, are summarised based on existing experimental results. Most importantly, the associated modelling work, describing the recrystallisation and the viscoplastic behaviour under hot forming conditions, is grouped into four types, to enable a clear and concise understanding of the existing quantitative micro–macro interactions, which are particularly valuable for the future development of advanced physically based multi-scale modelling work for hot-forming processes in aluminium alloys.

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A Physically Based Constitutive Model and Continuous Dynamic Recrystallization Behavior Analysis of 2219 Aluminum Alloy during Hot Deformation Process

Cited by 34 publications

References 53 publications

Possible Effects and Mechanisms of Ultrasonic Cavitation on Oxide Inclusions during Direct-Chill Casting of an Al Alloy

Possible Effects and Mechanisms of Ultrasonic Cavitation on Oxide Inclusions during Direct-Chill Casting of an Al Alloy

Static Softening Behavior and Modified Kinetics of Al 2219 Alloy Based on a Double-Pass Hot Compression Test

A Review of Microstructural Evolution and Modelling of Aluminium Alloys under Hot Forming Conditions

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