Mechanical behavior and microstructure of Ti20Hf20Zr20Ta20Nb20 high-entropy alloy loaded under quasi-static and dynamic compression conditions

Dirras, G.; Couque, H.; Lilensten, Lola; Heczel, Anita; Tingaud, David; Couzinié, Jean-Philippe; Perrière, Loïc; Gubicza, Jenő; Guillot, Ivan

doi:10.1016/j.matchar.2015.11.018

Cited by 99 publications

(19 citation statements)

References 64 publications

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“…Therefore, a very high yield strength can be observed even for HEAs with large grain sizes [7]. It was shown that during plastic deformation (e.g., in uniaxial compression or impact loading) of HEAs at room-temperature, a large density of dislocations is formed which gives an additional contribution to hardening in agreement with the wellknown Taylor formula [7,8]. Therefore, plastic deformation at high strains may improve the strength of HEAs considerably.…”

Section: Introductionmentioning

confidence: 77%

Defect structure and hardness in nanocrystalline CoCrFeMnNi High-Entropy Alloy processed by High-Pressure Torsion

Heczel

Kawasaki

Lábár

et al. 2017

Journal of Alloys and Compounds

108

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An equiatomic CoCrFeMnNi High-Entropy Alloy (HEA) produced by arc melting was processed by High-Pressure Torsion (HPT). The evolution of the microstructure during HPT was investigated after ¼, ½, 1 and 2 turns using electron backscatter diffraction and transmission electron microscopy. The spatial distribution of constituents was studied by energy-dispersive X-ray spectroscopy. The dislocation density and the twin-fault probability in the HPT-processed samples were determined by X-ray line profiles analysis. It was found that the grain size was gradually refined from ~60 µm to ~30 nm while the dislocation density and the twin-fault probability increased to very high values of about 194 × 10 14 m −2 and 2.7%, respectively, at the periphery of the disk processed for 2 turns. The hardness evolution was measured as a function of the distance from the center of the HPT-processed disks. After 2 turns of HPT, the microhardness increased from ~1440 MPa to ~5380 MPa at the disk periphery where the highest straining is achieved. The yield strength was estimated as onethird of the hardness and correlated to the microstructure.

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Section: Introductionmentioning

confidence: 77%

Defect structure and hardness in nanocrystalline CoCrFeMnNi High-Entropy Alloy processed by High-Pressure Torsion

Heczel

Kawasaki

Lábár

et al. 2017

Journal of Alloys and Compounds

108

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“…[17] Later, the same authors observed the formation of shear bands and kink bands during compression of the alloy at different strain rates. [18] However, the evolution of the microstructure and properties of this RHEA during such an industrially important deformation scheme as cold rolling is still an open issue. [10][11][12] In this study, the microstructure evolution of the HfNbTaTiZr RHEA during cold rolling, as well as mechanical properties of the severely deformed alloy, was thoroughly examined, and a crucial role of deformation kinking in an unusual mechanical behavior (low work hardening) of this alloy was revealed.…”

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confidence: 99%

“…[22,23] Kinking was observed in some alloys with BCC, HCP, and FCC structures, including refractory HEAs with BCC structure. [18,22,[24][25][26][27][28][29] As kinking can be considered as a type of cooperative deformation mechanism being controlled by slip, [23] the increase in dislocation density at the first stage (Figure 3b) induced the activation of kinking. In turn, the kink band formation improved the deformability of the alloy by stress relaxation and crystal reorientation, leading to geometric softening [30] observed at the second stage.…”

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confidence: 99%

Microstructure and Mechanical Properties Evolution in HfNbTaTiZr Refractory High‐Entropy Alloy During Cold Rolling

et al. 2020

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The effect of cold rolling on the structure and mechanical properties of the HfNbTaTiZr refractory high‐entropy alloy with a single body‐centered cubic (BCC) phase structure is studied. The microhardness evolution during cold rolling to the thickness strain εth = 80% shows three distinct stages: an increase till εth ≈ 15%, a plato in the interval ≈15–40%, and again some increase at εth ≥ 40%. This behavior is found to be associated with an increase in dislocation density at the first stage, the formation of kink bands at the second stage, and the development of shear bands with fine lamellar internal substructure at the third stage. After cold rolling to 80%, the alloy demonstrates the yield strength of 1220 MPa, peak strength 1320 MPa, and elongation to fracture 3.4%. A short steady‐state flow stage is observed on the engineering stress–strain curve that can also be associated with kinking.

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“…Table 1 of the data sheet illustrates the collected data from published studies so far [3] , [4] , [5] , [6] , [7] , [8] , [9] , [10] , [11] , [12] , [13] , [14] , [15] , [16] , [17] , [18] , [19] , [20] , [21] , [22] , [23] , [24] , [25] , [26] , [27] , [28] , [29] , [30] , [31] , [32] , [33] , [34] , [35] , [36] , [37] , [38] , [39] , [40] , [41] , [42] , [43] , [44] , [45] , [46] , [47] , [48] , [49] , [50] , [51] , [52] , [53] , [54] , [55] , [56] , for all the RHEAs / RCCAs: the alloy composition . Alloying elements are classified by alphabetic order and the subscripts indicate atom mole fraction.…”

Section: Experimental Design Materials and Methodsmentioning

confidence: 99%

Comprehensive data compilation on the mechanical properties of refractory high-entropy alloys

et al. 2018

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This data article presents the compilation of mechanical properties for 122 refractory high entropy alloys (RHEAs) and refractory complex concentrated alloys (RCCAs) reported in the period from 2010 to the end of January 2018. The data sheet gives alloy composition, type of microstructures and the metallurgical states in which the properties are measured. Data such as the computed alloy mass density, the type of mechanical loadings to which they are subjected and the corresponding macroscopic mechanical properties, such as the yield stress, are made available as a function of the testing temperature. For practical use, the data are tabulated and some are also graphically presented, allowing at a glance to access relevant information for this attractive category of RHEAs and RCCAs.

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Mechanical behavior and microstructure of Ti20Hf20Zr20Ta20Nb20 high-entropy alloy loaded under quasi-static and dynamic compression conditions

Cited by 99 publications

References 64 publications

Defect structure and hardness in nanocrystalline CoCrFeMnNi High-Entropy Alloy processed by High-Pressure Torsion

Defect structure and hardness in nanocrystalline CoCrFeMnNi High-Entropy Alloy processed by High-Pressure Torsion

Microstructure and Mechanical Properties Evolution in HfNbTaTiZr Refractory High‐Entropy Alloy During Cold Rolling

Comprehensive data compilation on the mechanical properties of refractory high-entropy alloys

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