The High Temperature Tensile and Creep Behaviors of High Entropy Superalloy

Tsao, Te Kang; Yeh, An‐Chou; Kuo, Chung-Ming; Kakehi, Koji; Murakami, Hideyuki; Yeh, Jien Wei; Jian, Sheng-Rui

doi:10.1038/s41598-017-13026-7

Cited by 170 publications

(98 citation statements)

References 51 publications

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“…Zhang et al [16] prepared Ni 47 [17]. The tensile yield strength of the directionally solidified Tsao alloy is 476 MPa at 950°C, which is close to that of single crystal (SC) superalloy CMSX-2 [18].…”

Section: Introductionmentioning

confidence: 72%

“…Then, they were prepared into an Φ 7 mm×110 mm SC rods via the directional-solidification and seed-crystal methods [20]. The samples were heat treated at 1200°C/10 h/ AC+1080°C/3 h/AC+850°C/24 h/AC, which is adjusted based on existing papers [18]. The tensile test was carried out at 850, 950, and 1000°C at a strain rate of 10 −3 s −1 .…”

Section: Methodsmentioning

confidence: 99%

“…We compared the tensile yield strengths of the HSHEA with the first (PWA1483 [22], DD8 [23], SRR99 [24], DD3 [25], DD13 [26], and CMSX-2 [27]), the second (DD5 [28] and DD 6 [23]) generation Nickel-based SC superalloys and the Tsao alloy [18] at elevated temperatures (figure 5). It should be noted that there are only partial tensile data of the reference alloys in the existing literatures.…”

Section: Tensile Property and Deformation Behaviormentioning

confidence: 99%

“…There are some transition metal HEAs which are designed to obtain coherent L1 2 precipitates (γ′ phase) via the addition of Al and Ti elements into the FCC matrix (γ phase), which always have good mechanical properties [8,[13][14][15][16][17][18]. Liu et al [13] studied the effect of Al addition on microstructure and mechanical properties of Ni 70−x Co 15 Cr 15 Al x .…”

Section: Introductionmentioning

confidence: 99%

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A new single crystal high entropy alloy with excellent high-temperature tensile property

Chen

Yuan

Ren

et al. 2020

Mater. Res. Express

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A new single crystal high entropy alloy is developed and produced using Bridgman directionalsolidification and seed-crystal method. The microstructure exhibits the directional dendrite morphology and is mainly composed of the FCC matrix and the L1 2 ordered precipitates. Its hightemperature yield strengths are far higher than those of the first-generation single crystal superalloys, and close to those of the second-generation ones. The solid-solution strengthening effect from the high content of W and Mo, as well as the precipitation strengthening effect from the combined addition of Al, Ti, Ta, and Nb, should be responsible for the excellent high-temperature strength of the investigated alloy.

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Section: Introductionmentioning

confidence: 72%

Section: Methodsmentioning

confidence: 99%

Section: Tensile Property and Deformation Behaviormentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A new single crystal high entropy alloy with excellent high-temperature tensile property

Chen

Yuan

Ren

et al. 2020

Mater. Res. Express

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“…The creep resistance and deformation mechanisms acting at various elevated temperatures were investigated recently [21]. The addition of stabilizing dispersion or addition of elements forming secondary phases into the microstructure enhanced the creep properties of HEA significantly [22,23]. The enhancement can be ascribed to the inhibited HEA grain growth controlled by the pinning effect of the second phase particles dispersion either on the grain boundaries or on the dislocations and twins.…”

Section: Introductionmentioning

confidence: 99%

Fatigue Behaviour and Crack Initiation in CoCrFeNiMn High-Entropy Alloy Processed by Powder Metallurgy

Chlup

Fintová

Hadraba

et al. 2019

Metals

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Single-phase equiatomic five-element high entropy alloy CoCrFeMnNi was prepared by powder metallurgy. Two materials with ultra-fine-grained microstructure were prepared by spark plasma sintering (SPS) of ball-milled powder at two sintering times (5 and 10 min), assigned as HEA 5 and HEA 10, respectively. Basic microstructural and mechanical properties were evaluated. The median grain size of the microstructures was determined to be 0.4 and 0.6 µm for HEA 5 and HEA 10, respectively. The differences in the microstructure led to a significant change in strength and deformation characteristics evaluated at room temperature. The effect of cyclic loading was monitored by three-point bending fatigue test. The results show that even relatively small change in the microstructure causes a significant effect on fatigue life. The fatigue endurance limit was measured to be 1100 MPa and 1000 MPa for HEA 5 and HEA 10, respectively. The detailed fractographic analysis revealed that abnormally large grains, localised in the microstructure on the tensile loaded surface, were a typical fatigue initiation site. The formation of (nano) twins together with dislocation slips caused the crack nucleation because of the cyclic loading.

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Phase Selection, Lattice Distortions, and Mechanical Properties in High‐Entropy Alloys

et al. 2020

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Increasing demand for improved physical, chemical, and mechanical properties led to the development of conventional alloys from single elements. These conventional alloys are made by selecting one or two major elements with desired properties, and other minor components are added to tune the properties to meet performance specifications. The conventional alloy design strategy is mainly based on the "solutesolvent" principle. However, another alloy design strategy based on multiprincipal elements in the near-equimolar ratio has recently been developed. In this multiprincipal element system, it is difficult to distinguish between the solute and the solvent, and various atoms are supposed to be randomly distributed in the crystal lattices (which has not been confirmed yet). This strategy, proposed by Yeh [1] and Cantor, [2] was based on the Boltzmann hypothesis of the relationship between entropy and system complexity. They proposed that the increased configurational entropy of mixing in alloys with multiple alloying elements in near-equiatomic proportions would overcome the enthalpy of compound formation, stabilizing solid solutions (SS) at the expense of intermetallics (IMs) during solidification. These multiprincipal element alloys are named "high entropy alloys" (HEAs), although the exact values of entropy in HEAs have not been experimentally measured yet. Since then, hundreds of HEAs with different combinations have been developed based on transition metals, refractory metals, and compound forming elements. [2-20] Most of these HEAs have been found to possess simple crystal structures such as the face-centered cubic (fcc) Fe-Co-Cr-Mn-Ni HEAs, [2] bodycentered cubic (bcc) Al-Co-Cr-Fe-Ni HEAs, [18] and the hexagonal close-pack (hcp) Ho-Dy-Y-Gd-Tb HEAs [6] when solidified from the melts. Experimental characterization techniques such as X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), differential scanning calorimetry (DSC), nanoindentation, tensile, wear-and corrosionresistance tests have been used to study the microstructureproperties correlations of HEAs. [3-50] These studies have revealed that HEAs possess superior properties, such as high hardness and strength, [23-29] superior corrosion and wear resistance, [3,30-35] good magnetic properties, [9,36-39,51] structural stability, [7,40,41] attractive mechanical properties at extreme temperature conditions, [21,42-47] and good electronic properties. [48,49] Yeh [50] proposed four core effects of HEAs, namely: 1) high-entropy effect; 2) sluggish diffusion effect; 3) sever lattice distortion effect; and 4) cocktail effect, in which the lattice distortion might be the key factor affecting the properties of HEAs. Although a complete understanding of lattice distortions in HEAs is still not established yet, significant progress in HEAs has been made recently.

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The High Temperature Tensile and Creep Behaviors of High Entropy Superalloy

Cited by 170 publications

References 51 publications

A new single crystal high entropy alloy with excellent high-temperature tensile property

A new single crystal high entropy alloy with excellent high-temperature tensile property

Fatigue Behaviour and Crack Initiation in CoCrFeNiMn High-Entropy Alloy Processed by Powder Metallurgy

Phase Selection, Lattice Distortions, and Mechanical Properties in High‐Entropy Alloys

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