Simultaneous enhancement of strength and ductility in a NiCoCrFe high-entropy alloy upon dynamic tension: Micromechanism and constitutive modeling

Zhang, T.W.; Ma, Shuang; Zhao, Dan; Wu, Yucheng; Zhang, Y.; Wang, Z.H.; Qiao, J.W.

doi:10.1016/j.ijplas.2019.08.013

Cited by 196 publications

(21 citation statements)

References 149 publications

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“…Lightweight design strategies and advanced energy applications are the requirement for next-generation high-performance structural materials. Improving the strength of lightweight aluminium or other alloys via nanosized precipitates or nanoparticles is an effective and low-cost method [Kim et al, 2015;Jiang et al, 2017;Wu et al, 2017;Lei et al, 2018;Yang et al, 2018; which has received extensive attention in recent decades [Ardell, 1985;Gladman, 1999;Kendig and Miracle, 2002;Zhao et al, 2006;Fazeli et al, 2008;Hull and Bacon, 2011;Xu et al, 2019;Zhang et al, 2020]. Over the past decades, extensive research has shown that precipitates can clearly increase the strength of aluminium or other alloys [Ardell, 1985;Gladman, 1999;Kendig and Miracle, 2002;Zhao et al, 2006;Fazeli et al, 2008;Teixeira et al, 2009;Knipling et al, 2010;Hull and Bacon, 2011;Ding et al, 2018;Fan et al, 2018;Luca et al, 2019;Xu et al, 2019;Zhang et al, 2020].…”

Section: Introductionmentioning

confidence: 99%

Experimental and modelling assessment of ductility in a precipitation hardening AlMgScZr alloy

Han

Chen

et al. 2021

International Journal of Plasticity

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Precipitation hardening is the most effective strategy to enhance the mechanical properties of metals. Dislocation mechanisms to control strengthening during precipitation have been demonstrated extensively. However, owing to the complexity of different precipitates in alloys, variations in ductility caused by precipitation are complex and have not been clarified so far. In this study, the effects of precipitation on ductility in precipitation hardening aluminium alloys are investigated based on a modified dislocation-based approach and experimental characterisation. The AlMgScZr alloy with spherical Al3(Sc, Zr) precipitates is used as a model alloy system to understand the effects of precipitation on ductility. Via heat treatment, shearable and nonshearable Al3(Sc, Zr) precipitates are introduced in the AlMg matrix. The results show that the ductility of AlMgScZr alloy decreases when shearable precipitates occur, while it increases with shearable precipitates being replaced by nonshearable precipitates. The variation in ductility of AlMgScZr alloy is mainly controlled by the dynamic recovery rate of the dislocations. Finally, by analysing the different precipitate-dislocation interactions and evaluating the dislocation density evolution during deformation, the dislocation mechanisms of 2 ductility during precipitation for AlMgScZr alloy are demonstrated. This study reveals the dislocation mechanism for controlling ductility during precipitation for AlMgScZr alloy which can provide a theoretical foundation for the design of high-performance structural materials.

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Section: Introductionmentioning

confidence: 99%

Experimental and modelling assessment of ductility in a precipitation hardening AlMgScZr alloy

Han

Chen

et al. 2021

International Journal of Plasticity

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“…Green and black symbols represent tensile and compression data, respectively, from other studies. To the best of our knowledge, our CrCoNi samples show the best overall dynamic strength and ductility at RT and cryogenic temperatures among engineering materials reported so far [13,[15][16][17][18][19][20][21][22]. TWIP steels also exhibited excellent ductility at cryogenic temperatures, attributed to deformation twinning [15].…”

Section: Comparison Of Mechanical Properties With Other Alloysmentioning

confidence: 67%

“…TWIP steels also exhibited excellent ductility at cryogenic temperatures, attributed to deformation twinning [15]. CrFeCoNi H/MEA was tested at 3000 s −1 ; however, complete curves were not obtained using a traditional SHTB system [13]. The TiZrNbHfTa HEA presented very high strength with very limited strain [21], probably due to its body-centred cubic structure possessing fewer slip systems.…”

Section: Comparison Of Mechanical Properties With Other Alloysmentioning

confidence: 99%

“…High strain rate restricts the mobility of dislocations and gives less time for dislocation slip [34]. The flow stress also increases after yield because the increasing interactions of dislocations hinder their motion [13].…”

Section: Yield Strength and Flow Stressmentioning

confidence: 99%

“…However, there has been no report on the high-strainrate tensile mechanical properties of H/MEAs because of the difficulty in acquiring complete high-strain-rate tensile stressstrain curves of materials with high ductility. The available literature related to high-strain-rate deformation of H/MEAs failed to present complete stress-strain curves due to the remarkable ductility and strength that the H/MEAs can reach under dynamic deformation [13]. Other than studies done under dynamic conditions, the combined effects of cryogenic temperature and high strain rate on the tensile mechanical properties of H/MEAs have never been reported.…”

Section: Introductionmentioning

confidence: 99%

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Exceptional high-strain-rate tensile mechanical properties in a CrCoNi medium-entropy alloy

Gao

et al. 2021

Sci. China Mater.

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Alloys with combined outstanding strength and excellent ductility are highly desirable for many structural applications. However, alloys subjected to deformation at very high strain rates and/or cryogenic temperatures usually suffer from very limited ductility. Here, we demonstrate that a bulk CrCoNi medium-entropy alloy presents exceptional combination of high strength and excellent ductility during deformation at high strain rates over a wide temperature range. Full tensile stress-strain curves at a high strain rate of 2000 s −1 and temperatures down to 77 K were successfully obtained using an electromagnetic Hopkinson tension bar system attached with a cooling device, revealing high true ultimate tensile strength (σ UTS,T ) of 1.8 GPa and true strain of ~54% at σ UTS,T . These outstanding mechanical properties were mainly attributed to profuse deformation twinning. Both high strain rate and cryogenic temperature promoted deformation twinning. Grain refinement caused by deformation twinning, dislocation slip and dynamic recrystallisation added to work hardening and the excellent tensile strain.

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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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Simultaneous enhancement of strength and ductility in a NiCoCrFe high-entropy alloy upon dynamic tension: Micromechanism and constitutive modeling

Cited by 196 publications

References 149 publications

Experimental and modelling assessment of ductility in a precipitation hardening AlMgScZr alloy

Experimental and modelling assessment of ductility in a precipitation hardening AlMgScZr alloy

Exceptional high-strain-rate tensile mechanical properties in a CrCoNi medium-entropy alloy

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

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Simultaneous enhancement of strength and ductility in a NiCoCrFe high-entropy alloy upon dynamic tension: Micromechanism and constitutive modeling

Cited by 196 publications

References 149 publications

Experimental and modelling assessment of ductility in a precipitation hardening AlMgScZr alloy

Experimental and modelling assessment of ductility in a precipitation hardening AlMgScZr alloy

Exceptional high-strain-rate tensile mechanical properties in a CrCoNi medium-entropy alloy

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

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Product

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