Flow softening behavior and microstructure evolution of Al–5Zn–2Mg aluminum alloy during dynamic recovery

Li, Luoxing; Wang, Guan; Liu, Jie; Yao, Zaiqi

doi:10.1016/s1003-6326(14)63026-0

Cited by 24 publications

(3 citation statements)

References 24 publications

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“…The KAM obtained from EBSD can be used to estimate the geometrically necessary dislocation density, ρ GND , of the alloy. The formula (Equation ( 3)) [26] used is as follows:…”

Section: Discussionmentioning

confidence: 99%

Cryogenic Deformation Behavior and Microstructural Characteristics of 2195 Alloy

Zhang

Tan

Wang

et al. 2021

Metals

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Cryogenic deformation can improve the strength and plasticity of Al–Li alloy, although the underlying mechanism is still not yet well understood. The effects of cryogenic temperature on the tensile properties and microstructure of an Al–Cu–Li alloy were investigated by means of tensile property test, roughness measurement, scanning electron microscope (SEM), optical microscope (OM), electron backscatter diffraction (EBSD), and transmission electron microscope (TEM). The results indicated that the strength and elongation of the as-annealed (O-state) and solution-treated (W-state) alloys increased with the decrease in deformation temperature, where the increasing trend of elongation of the W-state alloy was more significant than that of the O-state alloy. In addition, a temperature range was observed at approximately 178 K that caused the strength of the W-state alloy to slightly decrease. The decrease in temperature inhibited the dynamic recovery of the Al–Cu–Li alloy, which increased the dislocation density and the degree of work hardening, thus improving the strength of the alloy. At cryogenic temperatures, the internal grain structure was more involved in the deformation and the overall deformation was more uniform, which caused the alloy to have higher plasticity. This study provides a theoretical basis for the cryogenic forming of Al–Li alloy.

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“…The KAM obtained from EBSD can be used to estimate the geometrically necessary dislocation density, ρ GND , of the alloy. The formula (Equation ( 3)) [26] used is as follows:…”

Section: Discussionmentioning

confidence: 99%

Cryogenic Deformation Behavior and Microstructural Characteristics of 2195 Alloy

Zhang

Tan

Wang

et al. 2021

Metals

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show abstract

“…22 These equations help in establishing a relationship that helps in obtaining the response of material from external stimuli. 23 These equations reveal the behaviour of processes and are capable to predict flow data beyond the processing window. For different deformation conditions, that is, phase-wise, different constitutive equations can be developed.…”

Section: Introductionmentioning

confidence: 99%

Hot deformation behaviour of Ti alloys: A review on physical simulation and deformation mechanisms

Yadav

Saxena

Sehgal³

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part E:

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Titanium and its alloys, owing to their properties like high strength, toughness, corrosion resistance and thermal stability, are employable in various engineering and medical applications. The properties of titanium alloys depend upon the processing routes and their final microstructure. Therefore, the present review paper compiles the deformation behaviour of various alloys during hot deformation using a physical simulation. Subsequently, the flow stresses are analysed and utilized to develop the processing maps and the constitutive equations that are advantageous for predicting deformation mechanisms during the hot deformation. Specific features reported in the flow stress curves include work hardening, flow softening and steady-state behaviour. In certain cases, the yield point drop and oscillatory behaviour or serrations are also observed. Softening and oscillatory behaviour is an indicator of either dynamic recrystallization or flow-instability, whereas yield discontinuity signifies locking and unlocking of dislocations. In the processing maps, high power dissipation efficiency, η, reveals safe processing conditions, and the η value higher than 40% demonstrates dynamic recrystallization or globularization in the deformed microstructure, whereas the instability domain expresses shear band, flow localization, void formation and wedge cracks in the deformed microstructure. Amongst all the constitutive equations, the Arrhenius-type hyperbolic sine equation is the most suitable for Ti alloys for calculating flow stress and predicting dominant deformation mechanism using activation energy Q and stress exponent n.

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“…The true stress-strain curves obtained from compression are used to establish the relationships between flow stress and processing parameters based on constitutive equations or dynamic softening model. The researches of hot deformation behaviors of Al-Zn-Mg-Cu(Zr) alloy all indicated that the flow stress decreases with the increase of deformation temperature and decrease of strain rate [5][6]. Zhen et.…”

Section: Introductionmentioning

confidence: 99%

Constitutive Equation and Dynamic Softening Behavior of 7A55 Aluminum Alloy during Compression at Elevated Temperatures

Feng

Zhang

Liu

2017

MSF

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The hot deformation behaviors of 7A55 aluminum alloy were investigated by compression tests at temperatures ranging from 270°C to 450°C and strain rate ranging from 0.1s−1 to 25s−1. Tha rResults show that the flow stress increased with increasing strain rate and decreasing temperature. A two-stage constitutive equation was established and the hot deformation activation energy was 140 kJ/mol. EBSD observations show that the fine and equiaxed grains with the misorientation angle above 15° nucleated at the initial grain boundaries under high temperature and low strain rate conditions. It is concluded that the softening mechanism of 7A55 aluminum alloy is dynamic recovery (DRV), together with a partial dynamic recrystallization (DRX). The nucleation mechanism of DRX could be explained by the strain induced grain boundary migration (SIBM). The DRX softening model was established based on the dislocation density theory finally.

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Flow softening behavior and microstructure evolution of Al–5Zn–2Mg aluminum alloy during dynamic recovery

Cited by 24 publications

References 24 publications

Cryogenic Deformation Behavior and Microstructural Characteristics of 2195 Alloy

Cryogenic Deformation Behavior and Microstructural Characteristics of 2195 Alloy

Hot deformation behaviour of Ti alloys: A review on physical simulation and deformation mechanisms

Constitutive Equation and Dynamic Softening Behavior of 7A55 Aluminum Alloy during Compression at Elevated Temperatures

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