Fracture Toughness and Fatigue Crack Growth Behavior of As-Cast High-Entropy Alloys

Seifi, Mohsen; Li, Dongyue; Zhang, Yong; Liaw, Peter K.; Lewandowski, John J.

doi:10.1007/s11837-015-1563-9

Cited by 144 publications

(63 citation statements)

References 29 publications

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“…The lattice thermal conductivity decreases with the decrease of the grain size, which is due to the fact that the small grain size will enhance the long wave phonons scattering. The grain size and thermal conductivity of all samples conform to this rule [12][13][14][15].…”

Section: Discussionsupporting

confidence: 62%

“…Traditional alloys include one or two principal elements, but high entropy alloys (HEAs) were defined by Yeh et al as a new class of materials containing five or more principal elements, each with concentrations between 5 atomic percent (at %) and 35 atomic percent (at %) [1][2][3]. Studies have shown that HEAs exhibit some excellent properties, compared with conventional alloys, such as high hardness, great resistance to evaluation wear, corrosion, friction, fatigue, and oxidation [3][4][5][6][7][8][9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

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Effects of Y, GdCu, and Al Addition on the Thermoelectric Behavior of CoCrFeNi High Entropy Alloys

Dong

Zhou

Zhang

et al. 2018

Metals

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Thermoelectric (TE) materials can interconvert waste heat into electricity, which will become alternative energy sources in the future. The high-entropy alloys (HEAs) as a new class of materials are well-known for some excellent properties, such as high friction toughness, excellent fatigue resistance, and corrosion resistance. Here, we present a series of HEAs to be potential candidates for the thermoelectric materials. The thermoelectric properties of Y x CoCrFeNi, Gd x CoCrFeNiCu, and annealed Al 0.3 CoCrFeNi were investigated. The effects of grain size and formation of the second phase on thermoelectric properties were revealed. In HEAs, we can reduce the thermal conductivity by controlling the phonon scattering due to the considerable complexity of the alloys. The Y, Gd-doped HEAs are competitive candidate thermoelectric materials for energy conversion in the future.The thermoelectric-power generation or refrigeration device made of thermoelectric material has the advantages of being noise free, zero emission and pollution free, lacking vibration, small volume, etc. It has been applied in deep space exploration and refrigeration, and has great potential in waste heat power generation [20,21].Conventional thermoelectric materials currently in use include Bi 2 Te 3 based, PbTe based and SiGe based, etc. Bi 2 Te 3 is currently the most commercially successful thermoelectric material near room temperature. It is widely used in the field of the thermoelectric refrigeration, and is also the thermoelectric material with the highest power generation efficiency at low temperature [22]. Although Bi 2 Te 3 has been commercialized, its performance can be further improved by doping, composition adjustment, etc. PbTe is the medium temperature thermoelectric material that has been studied for the longest time and PbTe-based materials have been successfully used in the NASA aerospace missions many times since 1960. In recent years, PbTe-based thermoelectric materials have made great progress. The application temperature range of the Si-Ge alloy is more than 1000 K. It has been successfully applied to some deep space detectors. For example, in the radioisotope temperature difference battery of the Cassini Saturn detector, the thermoelectric conversion device is prepared by the Si-Ge alloy. However, the reserves of Te and Ge elements are scarce and very costly; Pb is toxic, pollutes the environment, and endangers people's health. Therefore, the development of environmentally friendly, new low-cost thermoelectric materials is particularly urgent.HEAs are always being studied for their mechanical properties. Maybe many new and unexpected properties remain for us to explore. In the search for TE materials, the performance of this kind of material is estimated by the dimensionless figure of merit, defined as ZT = S 2 Tσ/k [23], where S is the Seebeck coefficient, T is the absolute temperature, σ is the electrical conductivity, and k = k e + k l is the total thermal conductivity, where k e and k l are the electronic and lattice co...

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Section: Discussionsupporting

confidence: 62%

Section: Introductionmentioning

confidence: 99%

Effects of Y, GdCu, and Al Addition on the Thermoelectric Behavior of CoCrFeNi High Entropy Alloys

Dong

Zhou

Zhang

et al. 2018

Metals

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“…Fracture toughness and fatigue behavior are the key to the practical applications of high entropy alloys (HEAs) [1]. Hemphill et al's [2] four-point-bending fatigue experiments suggest that the fatigue behavior of Al 0.5 CoCrCuFeNi HEA is affected by microstructural defects of oxides and microcracks while Tang et al's [3] high-cycle four-point-bending fatigue experiments reveal that nanotwinning is the major deformation behavior before fracture in a Al 0.5 CoCrCuFeNi two-phase HEA.…”

Section: Introductionmentioning

confidence: 99%

Comparing Cyclic Tension-Compression Effects on CoCrFeMnNi High-Entropy Alloy and Ni-Based Superalloy

et al. 2019

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An equal-molar CoCrFeMnNi, face-centered-cubic (fcc) high-entropy alloy (HEA) and a nickel-based superalloy are studied using in situ neutron diffraction experiments. With continuous measurements, the evolution of diffraction peaks is collected for microscopic lattice strain analyses. Cyclic hardening and softening are found in both metallic systems. However, as obtained from the diffraction-peak-width evolution, the underneath deformation mechanisms are quite different. The CoCrFeMnNi HEA exhibits distinct lattice strain and microstructure responses under tension-compression cyclic loadings.

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“…One main reason for the great interest aroused by HEAs should be their great mechanical properties, such as hardness, compressive and tensile strengths, fatigue, and fracture toughness. [12][13][14][15][16][17][18][19][20][21] For hardness, the Al 1.5 FeCuCoNiCrTi HEA exhibits superior performance, which could reach 1100 HV. 12 AlCoCrFeNiMo 0.5 HEAs possess the excellent compressive strength, whose yield strength, fracture strength, and plastic strain could be 2757 MPa, 3036 MPa, and 2.5%, respectively.…”

Section: Introductionmentioning

confidence: 99%

Fundamental understanding of mechanical behavior of high-entropy alloys at low temperatures: A review

et al. 2018

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The basic principle of high-entropy alloys (HEAs) is that high mixing entropies of solid-solution phases enhance the phase stability, which renders us a new strategy on alloy design. The current research of HEAs mostly emphasizes mechanical behavior at room and higher temperatures. Relatively fewer papers are focused on low-temperature behaviors, below room temperature. However, based on the published papers, we can find that the low-temperature properties of HEAs are generally excellent. The great potential for cryogenic applications could be expected on HEAs. In this article, we summarized and discussed the mechanical behaviors and deformation mechanisms, as well as stacking-fault energies, of HEAs at low temperatures. The comparison of low-temperature properties of HEAs and conventional alloys will be provided. Future research directions will be suggested at the end.

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Fracture Toughness and Fatigue Crack Growth Behavior of As-Cast High-Entropy Alloys

Cited by 144 publications

References 29 publications

Effects of Y, GdCu, and Al Addition on the Thermoelectric Behavior of CoCrFeNi High Entropy Alloys

Effects of Y, GdCu, and Al Addition on the Thermoelectric Behavior of CoCrFeNi High Entropy Alloys

Comparing Cyclic Tension-Compression Effects on CoCrFeMnNi High-Entropy Alloy and Ni-Based Superalloy

Fundamental understanding of mechanical behavior of high-entropy alloys at low temperatures: A review

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