Mathematical Models to Predict Flow Stress and Dynamically Recrystallized Grain Size of Deformed AA7150-5 wt% B4C Composite Fabricated Using Ultrasonic-Probe Assisted Stir Casting Process

Seetharam, R.; Madhukar, Pagidi; Yoganjaneyulu, G.; Subbu, S. Kanmani; Davidson, M. J.

doi:10.1007/s12540-021-00967-y

Cited by 8 publications

(5 citation statements)

References 40 publications

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“…Initially, the flow stress rises sharply with strain because of the work hardening of the material brought on by the increased density of the dislocations and the retardation of the dislocations’ movement. 26 Additionally, there is a decrease in porosity at lower strain levels. As the process of deformation continues, the flow stress is unable to keep pace with the steadily increasing strain and, as a result, gradually reaches a steady state.…”

Section: Resultsmentioning

confidence: 99%

“…When the temperature of the deformation rises, the grain size of preform increases as well. 26 However, because the material fabrication process was PM, small microscopic changes such as changes in the grain size and the density of dislocations don't affect corrosion significantly. This is because the material is already 96% dense in its final form.…”

Section: Potentiodynamic Polarization Measurementmentioning

confidence: 99%

“…There were some research works by authors focused on the mathematical modeling of flow behavior, considering the deformation parameters such as deformation degree (strain), temperature, and strain rate is available. 26,27 For the hot upsetting of Al-Zn-Mg alloy using the PM method, only a limited amount of literature is available. The hot forging temperature range for aluminum is 260 to 510 °C; therefore, in this investigation, temperatures of 300, 400, and 500 °C were used.…”

Section: Introductionmentioning

confidence: 99%

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Investigating the effects of deformation-induced densification on the constitutive behavior and corrosion resistance of Al–Zn–Mg powder metallurgy alloy during hot deformation

Harikrishna,

Davidson,

Seetharam

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part L:

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The electrochemical behavior is most strongly influenced by deformation, which may either accelerate or decelerate failure during service. Therefore, in the present study, the Al–5.6Zn–2Mg alloy fabricated by powder metallurgy was subjected to hot deformation at various temperatures (300–500 °C) and strain rates (0.5–0.005 s−1) on a hydraulic press, and then, the effect of deformation-induced densification on corrosion behavior was studied using electrochemical corrosion tests. Flow stress is mathematically modeled using the strain-compensated Arrhenius model. The model developed was reliable to predict, with an average absolute relative error (AARE) of 3.16% and an R2 value of 0.98. The potentiodynamic polarization results showed that as the degree of porosity in a sintered sample is reduced, there was a decrease in the corrosion current density and an increase in the pitting potential. Al–5.6Zn–2Mg corrosion resistance significantly improved with deformation temperature, whereas strain rates decrease it, due to a decrease in pore content. Icorr of 2.4982 µA/cm2 and Epit of 0.876 V have been found for the highly deformed preforms under 500 °C and 0.005 s−1 strain rate condition. EIS results showed a high contact resistance of 2659 Ohm·cm2 and high hardness value of 113.12 Hv for the preform deformed under 500 °C and 0.005 s−1 strain rate. The reduction in porosity, decrease in active surface area after the deformation process, densification behavior, and hardness are all related to the electrochemical behavior. Pitting corrosion was observed in deformed preforms as a corrosion mechanism; the dynamic recovery feature is observed from the flow behavior.

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Section: Resultsmentioning

confidence: 99%

Section: Potentiodynamic Polarization Measurementmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Investigating the effects of deformation-induced densification on the constitutive behavior and corrosion resistance of Al–Zn–Mg powder metallurgy alloy during hot deformation

Harikrishna,

Davidson,

Seetharam

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part L:

Self Cite

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show abstract

“…An evaluation of the microstructure has been done to understand the grain size changes with increasing strain and temperature. It can be observed from figure 15 that as the temperature of the deformation rises, the grain size of the sample increases as well [23]. There have been reports in the literature [25,26] that when the size of the grains decreases, there are more grain boundaries, and these have more energy than the rest of the material.…”

Section: Morphologies Of Deformed Samples Before and After Corrosion ...mentioning

confidence: 91%

“…Two distinct types of structural alterations occurred in PM preforms as a direct consequence of high temperatures upsetting. One is an increase in grain size another is pore closure (densification) [17,23]. According to the results of the SEM investigation, pore closure predominates in the interaction that takes place.…”

Section: Morphologies Of Deformed Samples Before and After Corrosion ...mentioning

confidence: 99%

The effect of plastic strain and temperature on the corrosion resistance of the Al-5.6Zn-2Mg powder metallurgy alloy during hot upsetting

Harikrishna,

Davidson,

Rajmohan

2023

Eng. Res. Express

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Failure may be expedited or slowed down depending on the way the plastic strain interacts with the corrosive media. Therefore, in the present study, the Al-5.6Zn-2Mg alloy produced by the powder metallurgy process was subjected to hot deformation at different plastic strain levels and temperatures (300 0C-500 0C) on a hydraulic press, and then the impact on Corrosion susceptibility was studied using electrochemical corrosion tests in a 3.5% NaCl solution at room temperature. The results of potentiodynamic polarization showed that as deformation levels increased, the corrosion current density decreased and the pitting potential increased. The corrosion resistance of Al-5.6Zn-2Mg increased considerably with an increase in upsetting temperature, due to increasing grain size and a decrease in pore content. Icorr of 2.4982 (µA/cm2) and Epit -0.876 V have been found for the highly deformed preforms under 500 0C condition. EIS results showed a high contact resistance of 2659 Ohm.cm2 for the sample deformed under 500 0C. After the deformation process, densification behaviour is related to the electrochemical behaviour. Pitting corrosion occurred in all deformed samples, while intergranular corrosion was found only in the severely deformed samples.

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New Method for Microstructure Segmentation and Automatic Grain Size Determination Using Computer Vision Technology during the Hot Deformation of an Al-Zn-Mg Powder Metallurgy Alloy

Harikrishna,

Davidson,

Reddy

2023

J. of Materi Eng and Perform

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Mathematical Models to Predict Flow Stress and Dynamically Recrystallized Grain Size of Deformed AA7150-5 wt% B4C Composite Fabricated Using Ultrasonic-Probe Assisted Stir Casting Process

Cited by 8 publications

References 40 publications

Investigating the effects of deformation-induced densification on the constitutive behavior and corrosion resistance of Al–Zn–Mg powder metallurgy alloy during hot deformation

Investigating the effects of deformation-induced densification on the constitutive behavior and corrosion resistance of Al–Zn–Mg powder metallurgy alloy during hot deformation

The effect of plastic strain and temperature on the corrosion resistance of the Al-5.6Zn-2Mg powder metallurgy alloy during hot upsetting

New Method for Microstructure Segmentation and Automatic Grain Size Determination Using Computer Vision Technology during the Hot Deformation of an Al-Zn-Mg Powder Metallurgy Alloy

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