Towards strength-ductility synergy in a CrCoNi solid solution alloy via nanotwins

Jiang, Kun; Gan, Bin; Li, Jianguo; Dou, Qingbo; Suo, Tao

doi:10.1016/j.msea.2021.141298

Cited by 29 publications

(4 citation statements)

References 51 publications

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“…These two mechanisms are in competition during deformation, and the dominance mainly depends on the SFE of the material. Furthermore, the deformation mechanism also depends on the processing parameters, especially the strain rate and the deformation temperature [30]. Normally, the twin boundaries act as strong obstacles to the dislocation motion, leading to high strain-hardening.…”

Section: Effect Of Rolling Temperature On Microstructure and Properti...mentioning

confidence: 99%

Work Hardening Behavior and Microstructure Evolution of a Cu-Ti-Cr-Mg Alloy during Room Temperature and Cryogenic Rolling

Xiao

Zhou

et al. 2023

Materials

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A Cu-1.79Ti-0.39Cr-0.1Mg (wt.%) alloy was prepared by a vacuum induction melting furnace in a high-purity argon atmosphere. The effects of room temperature rolling and cryogenic rolling on the microstructure, textures, and mechanical properties of the alloy were investigated by means of electron backscatter diffraction, transmission electron microscopy, and X-ray diffraction. The results show that the hardness of the cryogenically rolled alloy is 18–30 HV higher than that of the room temperature rolled alloy at any tested rolling reduction. The yield strength and tensile strength of the alloy cryogenically rolled by 90% reduction are 723 MPa and 796 MPa, respectively. With the increase of rolling reduction, the orientation density of the Cube texture decreases, while the Brass texture increases. The Brass texture is preferred especially during the cryogenic rolling, suggesting that the cross-slip is inhibited at the cryogenic temperature. The dislocation densities of Cu-Ti-Cr-Mg alloy increase significantly during the deformation, finally reaching 23.03 × 10−14 m−2 and 29.98 × 10−14 m−2 after a 90% reduction for the room temperature rolled and cryogenically rolled alloys, respectively. This difference could be attributed to the impediment effect of cryogenic temperature on dynamic recovery and dynamic recrystallization. The cryogenic temperature promotes the formation of the dislocation and the nano-twins, leading to the improvement of the mechanical properties of the alloy.

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Section: Effect Of Rolling Temperature On Microstructure and Properti...mentioning

confidence: 99%

Work Hardening Behavior and Microstructure Evolution of a Cu-Ti-Cr-Mg Alloy during Room Temperature and Cryogenic Rolling

Xiao

Zhou

et al. 2023

Materials

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“…Consequently, scrutinizing the mechanical properties and deformation mechanism of EHEAs in these harsh environments is a factor of decisive importance. Nonetheless, research on dynamic response mainly focuses on multi-principal-element alloys with a single FCC phase structure, such as CoCrFeNiMn, Al 0.1 CoCrFeNi, Al 0.3 CoCrFeNi and CrCoNi alloys [ 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 ]. Despite demonstrating considerable work hardening and impressive plasticity under dynamic load, the relatively low yield strength of these high-entropy alloys curtails their engineering effectiveness notably [ 33 ].…”

Section: Introductionmentioning

confidence: 99%

“…Nonetheless, research on dynamic response mainly focuses on multi-principal-element alloys with a single FCC phase structure, such as CoCrFeNiMn, Al 0.1 CoCrFeNi, Al 0.3 CoCrFeNi and CrCoNi alloys [ 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 ]. Despite demonstrating considerable work hardening and impressive plasticity under dynamic load, the relatively low yield strength of these high-entropy alloys curtails their engineering effectiveness notably [ 33 ]. In contrast, despite its significant engineering potential, the exploration of the mechanical behaviors of EHEA under high strain rates is still in the early stages.…”

Section: Introductionmentioning

confidence: 99%

High-Strain-Rate Deformation Behavior of Co0.96Cr0.76Fe0.85Ni1.01Hf0.40 Eutectic High-Entropy Alloy at Room and Cryogenic Temperatures

Jiang,

Xiong,

Chen

2024

Materials

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The deformation behaviors of Co0.96Cr0.76Fe0.85Ni1.01Hf0.40 eutectic high-entropy alloy (EHEA) under high strain rates have been investigated at both room temperature (RT, 298 K) and liquid nitrogen temperature (LNT, 77 K). The current Co0.96Cr0.76Fe0.85Ni1.01Hf0.40 EHEA exhibits a high yield strength of 740 MPa along with a high fracture strain of 35% under quasi-static loading. A remarkable positive strain rate effect can be observed, and its yield strength increased to 1060 MPa when the strain rate increased to 3000/s. Decreasing temperature will further enhance the yield strength significantly. The yield strength of this alloy at a strain rate of 3000/s increases to 1240 MPa under the LNT condition. Moreover, the current EHEA exhibits a notable increased strain-hardening ability with either an increasing strain rate or a decreasing temperature. Transmission electron microscopy (TEM) characterization uncovered that the dynamic plastic deformation of this EHEA at RT is dominated by dislocation slip. However, under severe conditions of high strain rate in conjunction with LNT, dislocation dissociation is promoted, resulting in a higher density of nanoscale deformation twins, stacking faults (SFs) as well as immobile Lomer–Cottrell (L-C) dislocation locks. These deformation twins, SFs and immobile dislocation locks function effectively as dislocation barriers, contributing notably to the elevated strain-hardening rate observed during dynamic deformation at LNT.

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“…Various approaches have been exerted to strengthen the CoCrNi alloys, including boron-and nitrogen-doping [10,11], coherent precipitates, brittle intermetallics [12][13][14] as well as grain refinement [15,16]. Among these approaches, grain refinement via severe plastic deformation (SPD), such as high-pressure torsion (HPT), is usually only appropriate for fabricating small samples, which cannot satisfy the requirements for a wide range of engineering applications [17].…”

Section: Introductionmentioning

confidence: 99%

Ultrastrong and ductile (CoCrNi)94Ti3Al3 medium-entropy alloys via introducing multi-scale heterogeneous structures

Zou¹,

Yang²,

Dong³

et al. 2023

Journal of Materials Science & Technology

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Towards strength-ductility synergy in a CrCoNi solid solution alloy via nanotwins

Cited by 29 publications

References 51 publications

Work Hardening Behavior and Microstructure Evolution of a Cu-Ti-Cr-Mg Alloy during Room Temperature and Cryogenic Rolling

Work Hardening Behavior and Microstructure Evolution of a Cu-Ti-Cr-Mg Alloy during Room Temperature and Cryogenic Rolling

High-Strain-Rate Deformation Behavior of Co0.96Cr0.76Fe0.85Ni1.01Hf0.40 Eutectic High-Entropy Alloy at Room and Cryogenic Temperatures

Ultrastrong and ductile (CoCrNi)94Ti3Al3 medium-entropy alloys via introducing multi-scale heterogeneous structures

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