A JMAK-microhardness model for quantifying the kinetics of restoration mechanisms in inhomogeneous microstructure

Kalu, Peter N.; Waryoba, Daudi R.

doi:10.1016/j.msea.2007.01.124

Cited by 48 publications

(30 citation statements)

References 31 publications

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“…Optical microscopy is an analysis technique that can be used to study the microstructure evolution of metals during deformation [1,2]. The scanning electron microscopy (SEM) is a good way, which is used to observe the micro-strain within the materials [2,3].…”

Section: Introductionmentioning

confidence: 99%

Microstructural Study and Recrystallization Kinetics of Deformed Commercial Copper Wires

Fellah¹,

Diha²,

Boumerzoug³

2018

Acta Metall. Slovaca

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This work aims to investigate the microstructure after cold-wiredrawing process of commercial copper and its recrystallization kinetics under isochronal annealing. In this paper, the samples studied are commercial copper wires reduced at six different reductions by a wiredrawing at room temperature. Optical microscopy, Scanning Electron Microscopy (SEM), and DSC were used as characterization techniques. The samples were annealed under Argon atmosphere with four different heating rates by using DSC. The Kissinger, Ozawa, Boswell, and Starink methods were used to determine the recrystallization kinetics. The results showed that the cold-wiredrawing had caused the elongation of grains along the main axis of the wires also showed the existence of slip bands. It has been found, on the one side, that the recrystallization temperature increased and shifted to higher temperatures as the heating rate increased, which means that this reaction is thermally actived; On the other sidethe recrystallization temperature clearly shifted to lower temperatures as the deformation increased, which indicated that recrystallization is profoundly enhanced by high deforming.We noted a decrease in the activation energy values when the reduction increases, the activation energy for the most reduced materials were lower than that in the less reduced wires.

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Section: Introductionmentioning

confidence: 99%

Microstructural Study and Recrystallization Kinetics of Deformed Commercial Copper Wires

Fellah¹,

Diha²,

Boumerzoug³

2018

Acta Metall. Slovaca

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“…The recrystallization kinetics includes the peak strain equation and dynamic recrystallization fraction equation, while the grain growth kinetics dynamic can be described by recrystallization grain size equation [7]. The Johnson-Mehl-Avrami-Kolmogorov (JMAK) microhardness model was proposed by Kalu et al to quantify the kinetics of restoration mechanisms in inhomogeneous microstructure [8]. The DRX kinetics model was proposed based on Avrami function to study the dynamic recrystallization for metal alloy [9,10].…”

Section: Introductionmentioning

confidence: 99%

Dynamic Recrystallization Behavior of TA15 Titanium Alloy under Isothermal Compression during Hot Deformation

Luo

Heng

Wang

et al. 2014

Advances in Materials Science and Engineering

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In order to improve the understanding of the dynamic recrystallization (DRX) behaviors of TA15 titanium alloy (Ti-6Al-2Zr-1Mo-1V), a series of experiments were conducted on a TMTS thermal simulator at temperatures of 1173 K, 1203 K, 1223 K, and 1273 K with the strain rates of 0.005 s−1, 0.05 s−1, 0.5 s−1, and 1 s−1. By the regression analysis for conventional hyperbolic sine equation, the activation energy of DRX inα+βtwo-phase region isQS=588.7 Kg/moland inβregion isQD=225.8 Kg/mol, and a dimensionless parameter controlling the stored energy was determined asZ/A=ε˙exp(588.7×103)/RT/6.69×1026inα+βtwo-phase region and asZ/A=ε˙exp(225.8×103)/RT/5.13×1011inβregion. The DRX behaviors of TA15 titanium alloy were proposed on the strength of the experiment results. Finally, the theoretical prediction results of DRX volume fraction were shown to be in agreement with experimental observations.

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“…The transformed volume fraction can be analyzed from the material property evolution. By assuming that the material properties vary linearly with respect to the transformed volume fraction, the transformation kinetics can be described by the Johnson-Mehl-Avrami-Kolmogorov (JMAK) equation [12,13] min max min…”

Section: Classical Qfamentioning

confidence: 99%

Prediction and Experimental of Yield Strengths of As-Quenched 7050 Aluminum Alloy Thick Plates after Continuous Quench Cooling

Chen

Liu

et al. 2019

Metals

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The aim of this study was to predict the yield strength of as-quenched aluminum alloys according to their continuous quench cooling path. Our model was established within the framework of quench factor analysis (QFA) by representing a quenching curve as a series of consecutive isothermal transformation events and adding the yield strength increments after each isothermal step to predict the yield strength after continuous quench cooling. For simplification; it was considered that the effective hardeners during quenching were the nanosized solute clusters formed at low temperatures, whereas the other coarse precipitates were neglected. In addition, quenching tests were conducted on aluminum plates with different thicknesses. The predictions were compared with the experimental measurements, and the results showed that the predictions fit the measurements well for the 40-and 80-mm-thick plates but overestimated the as-quenched yield strength at the mid-thickness of the 115-mm-thick plates.

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A JMAK-microhardness model for quantifying the kinetics of restoration mechanisms in inhomogeneous microstructure

Cited by 48 publications

References 31 publications

Microstructural Study and Recrystallization Kinetics of Deformed Commercial Copper Wires

Microstructural Study and Recrystallization Kinetics of Deformed Commercial Copper Wires

Dynamic Recrystallization Behavior of TA15 Titanium Alloy under Isothermal Compression during Hot Deformation

Prediction and Experimental of Yield Strengths of As-Quenched 7050 Aluminum Alloy Thick Plates after Continuous Quench Cooling

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