Strain-rate effect upon the tensile behavior of CoCrFeNi high-entropy alloys

Huo, Wenyi; Zhou, Hui; Fang, Feng; Hu, Xiulin; Xie, Zonghan; Jiang, Jianqing

doi:10.1016/j.msea.2017.02.077

Cited by 80 publications

(31 citation statements)

References 29 publications

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“…While there have been studies on its mechanical behavior and microstructure [5,8,13,14,17] [14]. Also, as the temperature decreased the ductility increased.…”

Section: Cocrfeni High Entropy Alloymentioning

confidence: 99%

“…Huo et al studied the strain rate effect on CoCrFeNi's quasi-static tensile behavior and observed a shift in the dominant deformation mechanism from dislocation motion at the lower strain-rate of 1 × 10 −3 s -1 to stacking faults at higher strain-rate of 1 × 10 −2 s -1 [8].…”

Section: Cocrfeni High Entropy Alloymentioning

confidence: 99%

“…High-entropy alloys (HEAs) provide a viable replacement to conventional materials (e.g. stainless steel and nickel-base superalloy) in critical load-bearing applications because of their high strength, ductility, fracture resistance and corrosion resistance, some even down to cryogenic temperatures[6,8,9,13,14,21, 37]. Structural materials need to have both high strength and high ductility, but these two properties are usually inversely proportional to each other in conventional metal alloys.…”

mentioning

confidence: 99%

“…Structural materials need to have both high strength and high ductility, but these two properties are usually inversely proportional to each other in conventional metal alloys. This trade-off has caused challenges in the development of high performance metal alloys[8].Conventionally, metal alloys are developed by selecting the main component based on the most important property required. Then, alloying elements are added to provide other needed properties [4, 5, 9].…”

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confidence: 99%

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Effect of Strain Rate on the Tensile Behavior of CoCrFeNi and CoCrFeMnNi High-Entropy Alloys

Shabani

Indeck

Hazeli

et al. 2019

J. of Materi Eng and Perform

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High entropy alloys (HEAs) are a new class of alloys with the potential to be used in critical load bearing applications instead of conventional alloys. The HEAs studied in this research were CoCrFeNi and CoCrFeMnNi. Both were single-phase face-centered cubic materials. The focus of this study was on the tensile behavior of the two materials at quasi-static and dynamic strain-rates (10 −4 to 10 3 s −1) and the underlying microstructural phenomena driving the behaviors. Electron back-scatter diffraction was performed on both HEAs to study the microstructure before mechanical testing. To study the effect of strain rate, tensile experiments were performed at quasi-static strain rates on hydraulic MTS load frames and dynamic strain-rates on a Split-Hopkinson Pressure Bar. HEAs stressstrain curves, modulus of elasticity, yield strength, ultimate strength, strain-rate sensitivity and work hardening rates were calculated with the data from the tensile experiments. Transmission electron microscopy was performed post-mortem to study the plastic deformation mechanisms activated at different strain rates. The dominant deformation mechanism changed from dislocation slip at quasi-static strain-rates to the addition of deformation nano-twins at dynamic strain-rates. Ultimate strength and ductility both improved with the increase of strain-rate, which can be attributed to the activation of deformation nano-twins in HEAs. CoCrFeNi and CoCrFeMnNi both have low stacking fault energies which encouraged twinning at high strains to accommodate plastic deformation. The strain-rate sensitivity component increased with increasing strain-rate, beginning with negligible strain-rate sensitivity in the quasi-static range to high strain-rate sensitivity in the dynamic range. CoCrFeMnNi showed greater strain-rate sensitivity. CoCrFeNi, with the less configurational entropy, had higher iii mechanical properties and strain hardening rates at different strain-rates compared to CoCrFeMnNi.

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“…While there have been studies on its mechanical behavior and microstructure [5,8,13,14,17] [14]. Also, as the temperature decreased the ductility increased.…”

Section: Cocrfeni High Entropy Alloymentioning

confidence: 99%

Section: Cocrfeni High Entropy Alloymentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Effect of Strain Rate on the Tensile Behavior of CoCrFeNi and CoCrFeMnNi High-Entropy Alloys

Shabani

Indeck

Hazeli

et al. 2019

J. of Materi Eng and Perform

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“…The stress-strain curve, proof stress and strain-hardening exponent of the thin film on substrate can be obtained by in-situ XRD stress analysis combined with the tensile test [8] . Supported by X-ray diffraction, microstructure analysis and tensile testing, the mechanical response of high entropy alloys to varying strain rates was investigated [9] . Tensile tests on commercially pure a-titanium show a three-stage behaviour giving rise to a well on the strain dependence of the work hardening [10] .…”

Section: Introductionmentioning

confidence: 99%

The Relationship between Tensile Strain and Residual Stress of High Strength Dual Phase Steel Sheet

a¹,

Meng²,

Tian³

et al. 2018

MATEC Web Conf.

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Abstract. The relation between residual stress and tensile strain is an important factor for evaluating plastic formation grade of steel sheet. The degree of plastic deformation (Δl) and elastic recovery (δ) were obtained by measuring the length of DP600 steel sheet sample under different tensile test conditions, i.e. five tensile strains (ε). Furthermore, the average residual stress value in the surface middle (the diameter of 10 mm) region of above tensile samples was analyzed by x-ray diffraction (XRD) in the crystal plane of (211). By processing the diffraction peak angle (2θ) with half width high method (FWHM), the relationship between sin 2 (ψ) and diffraction angle is attained by least squares method. On this basis, a mathematical model was established to correlate the tensile strain with the residual stress in the present study. The results show that the residual stress decreases and the elastic recovery increases with the increase of tensile strain (ε≤0.205). The relation between residual stress and tensile strain can be described with an exponential function . Finally, a function of tensile strain, elastic recovery and surface residual stress is established, by which a reasonable forming condition, viz. ε=0.205, δ=2.65 mm is determined for achieving the smallest σψ.

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Strain‐Rate Sensitive Deformation Behavior under Tension and Compression of Al_0.3CrFeCoNiMo_0.2

et al. 2021

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Herein, the strain‐rate sensitive deformation behavior of a sintered Al‐ and Mo‐modified CrFeCoNi high‐entropy alloy (HEA) is focused. The sintered microstructure is investigated using scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), energy‐dispersive X‐ray spectroscopy (EDS), and X‐ray diffraction. It was found that after sintering, the microstructure is of very low porosity (<1%) and consists of an ultrafine Mo‐ and Cr‐rich σ phase embedded in a fine‐grained face‐centered cubic (FCC) matrix. Electron microscopy reveals another secondary phase in which Al and Ni are concentrated. For a detailed discussion of the deformation behavior under tension and compression, tensile and compression tests were conducted at strain rates of 10−3, 10, and 102 s−1. Strain‐rate sensitive deformation behavior in terms of strength is observed. The strain hardening rates show no significant strain rate sensitivity (SRS) up to strain rates of 10 s−1. However, at higher strain rates and under compressive loading, a distinctly increased strain hardening rate is found. Tension/compression asymmetry is determined since the SRS value m is twice as high under compression than under tension.

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Strain-rate effect upon the tensile behavior of CoCrFeNi high-entropy alloys

Cited by 80 publications

References 29 publications

Effect of Strain Rate on the Tensile Behavior of CoCrFeNi and CoCrFeMnNi High-Entropy Alloys

Effect of Strain Rate on the Tensile Behavior of CoCrFeNi and CoCrFeMnNi High-Entropy Alloys

The Relationship between Tensile Strain and Residual Stress of High Strength Dual Phase Steel Sheet

Strain‐Rate Sensitive Deformation Behavior under Tension and Compression of Al_0.3CrFeCoNiMo_0.2

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Strain-rate effect upon the tensile behavior of CoCrFeNi high-entropy alloys

Cited by 80 publications

References 29 publications

Effect of Strain Rate on the Tensile Behavior of CoCrFeNi and CoCrFeMnNi High-Entropy Alloys

Effect of Strain Rate on the Tensile Behavior of CoCrFeNi and CoCrFeMnNi High-Entropy Alloys

The Relationship between Tensile Strain and Residual Stress of High Strength Dual Phase Steel Sheet

Strain‐Rate Sensitive Deformation Behavior under Tension and Compression of Al0.3CrFeCoNiMo0.2

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Strain‐Rate Sensitive Deformation Behavior under Tension and Compression of Al_0.3CrFeCoNiMo_0.2