Hot deformation behavior of CoCrFeMnNi FCC high entropy alloy

Eleti, Rajeshwar R.; Bhattacharjee, Tilak; Zhao, Lijia; Bhattacharjee, P.P.; Tsuji, Nobuhiro

doi:10.1016/j.matchemphys.2017.06.062

Cited by 133 publications

(55 citation statements)

References 44 publications

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“…Temperature and strain rate play important roles on the mechanical behavior of the CoCrFeMnNi high-entropy alloy and of materials in general [2,3,5]. Otto et al [2] studied the effect of temperature on the tensile properties of a CoCrF-eMnNi high-entropy alloy and reported that this alloy exhibits a strong increase in ductility and mechanical strength with decreasing temperature.…”

Section: Introductionmentioning

confidence: 99%

Effects of Adiabatic Heating and Strain Rate on the Dynamic Response of a CoCrFeMnNi High-Entropy Alloy

Soares

Patnamsetty

Peura

et al. 2019

J. dynamic behavior mater.

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This work presents a comprehensive analysis of the effects of strain and strain rate on the adiabatic heating and the mechanical behavior of a CoCrFeMnNi high-entropy alloy (HEA). In this investigation, compression tests were carried out at quasi-static and dynamic strain rates. The temperature of the specimens was measured using high speed infrared thermography. The high strain rate tests were conducted with a Split Hopkinson Pressure Bar, and the tests at lower strain rates were performed using a universal testing machine. The material exhibited a positive strain rate sensitivity, as true stress-strain plots were shifted upwards with the increase in strain rate. With exception of the isothermal tests, temperature rise and the Taylor-Quinney coefficient (β) were noticeably similar for the investigated strain rates. This study shows that the common assumption that β can be considered 0.9 and constant is possibly not very accurate for the CoCrFeMnNi alloy. The β is influenced by at least strain and strain rate.

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Section: Introductionmentioning

confidence: 99%

Effects of Adiabatic Heating and Strain Rate on the Dynamic Response of a CoCrFeMnNi High-Entropy Alloy

Soares

Patnamsetty

Peura

et al. 2019

J. dynamic behavior mater.

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“…Jeong et al [33] have reported high-temperature hot deformation behaviour of a cast and homogenized CoCrFeMnNi HEA (average grain size 419 µm) in the temperature and strain rate regimes of 1023-1323 K and 10 −3 s −1 to 10 s −1 , respectively, and developed processing maps. Eleti et al [34], on the other hand, have reported high-temperature deformation characteristics of a hot forged (1023 K) CoCrFeMnNi HEA compressed at different temperatures (1073 K, 1173 K and 1273 K) and strain rates (10 −3 s −1 , 10 −2 s −1 and 1 s −1 ). While Jeong et al [33] determined the activation energy of deformation (Q) to be about 312 kJ/mol for CoCrFeMnNi HEA, the corresponding calculations by Eleti et al [34] based on a narrow temperature range gave a higher value of 350kJ/mol.…”

Section: Introductionmentioning

confidence: 99%

Constitutive modelling of hot deformation behaviour of a CoCrFeMnNi high-entropy alloy

Patnamsetty

Saastamoinen

Somani

et al. 2020

Science and Technology of Advanced Materials

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Models describing the constitutive flow behaviour of a metallic material are desired for appropriate process design and realization of defect-free components. In this study, constitutive equations based on the hyperbolic-sinusoidal Arrhenius-type model have been developed to define the hot deformation characteristics of a CoCrFeMnNi high-entropy alloy. The experimental true stress-true strain data were generated over a wide temperature (1023-1423 K) and strain rates (10 −3-10 s −1) ranges. The impact of strain rate and temperature on deformation behaviour was further characterized through a temperature compensated strain rate parameter, i.e. Zener-Hollomon parameter. Additionally, a mathematical relation was employed to express the influence of various material constants on true-strain ranging from 0.2 to 0.75. Typical third order polynomial relations were found to be appropriate to fit the true-strain dependency of these material constants. The accuracy of the developed constitutive equations was evaluated by using the average absolute relative error (AARE) and correlation coefficient (R); the obtained values were 7.63% and 0.9858, respectively, suggesting reasonable predictions. These results demonstrate that the developed constitutive equations can predict the flow stress behaviour of the alloy with a good accuracy over a wide range of temperature and strain rate conditions and for large strains.

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“…Huang et al 16 found that higher Z-values correspond to work hardening and dynamic precipitation mechanisms in the hot deformation of 2026 aluminum alloy. Rajeshwar et al 17 reported that the fraction and size of DRX grains were dependent on Z-value. In general, the Z parameter is closely related to the micro-evolution mechanisms during the thermal deformation process of alloys.…”

Section: Introductionmentioning

confidence: 99%

Double Identification of the Optimal Hot Deformation Parameter Windows for AlCu4SiMg Alloy

Tong¹,

Quan

Zhao

et al. 2019

Mat. Res.

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In order to achieve hot processing products with expected microstructures, the construction of corresponding relationships between micro-evolution mechanisms and hot processing parameters is essential. In this study, such corresponding relationships of as-cast AlCu4SiMg alloy were constructed by double evaluating processing maps and Zener-Holloman (Z) parameter maps. Based on the stressstrain data obtained from a series of isothermal compression experiments, the processing maps of AlCu4SiMg alloy were constructed at the strain of 0.3, 0.5, 0.7 and 0.9 s-1. The processing maps revealed that the optimal hot deformation parameter windows corresponding to dynamic recrystallization (DRX) micro-evolution mechanism mainly appear at high temperature and moderate strain rate. On the other hand, the response maps of Z parameter at discrete strains were constructed, and the ideal processing windows were calibrated at the domains with relatively low lnZ-value. A phenomenon was found that the optimal deformation parameter windows identified by Z parameter are more conservative than those identified by processing map. By integrating processing maps and Z parameter maps, the optimal processing parameter windows corresponding to DRX micro-evolution mechanism for AlCu4SiMg alloy were finally obtained.

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Hot deformation behavior of CoCrFeMnNi FCC high entropy alloy

Cited by 133 publications

References 44 publications

Effects of Adiabatic Heating and Strain Rate on the Dynamic Response of a CoCrFeMnNi High-Entropy Alloy

Effects of Adiabatic Heating and Strain Rate on the Dynamic Response of a CoCrFeMnNi High-Entropy Alloy

Constitutive modelling of hot deformation behaviour of a CoCrFeMnNi high-entropy alloy

Double Identification of the Optimal Hot Deformation Parameter Windows for AlCu4SiMg Alloy

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