High hardness dual-phase high entropy alloy thin films produced by interface alloying

Published on Mar 15, 2019in Scripta Materialia5.611
· DOI :10.1016/J.SCRIPTAMAT.2018.11.004
Y.P. Cai5
Estimated H-index: 5
(NU: Nanjing University),
G.J. Wang5
Estimated H-index: 5
(NU: Nanjing University)
+ 2 AuthorsXiangkang Meng38
Estimated H-index: 38
(NU: Nanjing University)
Source
Abstract
Abstract In this work, we present a tunable alloying strategy to prepare high entropy alloy (HEA) thin films with FCC/BCC dual-phase structure. The dual-phase HEA films consist of uniformly equiaxed grains with average size about 40 nm. Comparing with single-phase FCC HEA, the dual-phase HEA has higher hardness up to 10.4 GPa. The relative large atomic radius of Al leads to severe lattice distortion, resulting in a stronger solid solution strengthening behavior in the dual-phase HEA. Moreover, high dense heterogeneous phase interfaces effectively blocking dislocation motion enhance the strain hardening ability further.
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References28
Newest
#1I. BasuH-Index: 12
#2Vaclav OcelikH-Index: 29
Last. Jeff Th. M. De HossonH-Index: 29
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The current review outlines the size-dependent plastic behavior of high-entropy alloys (HEAs) and the underlying deformation mechanisms. Particular focus is laid upon the influence of microstructural design on the small-scale deformation characteristics. The role of defect types as carriers of plasticity is appraised and correlated with the frequently observed mechanical behavior peculiar to the breed of HEAs. Deformation response is classified on the basis of mechanical testing techniques probi...
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#1I. BasuH-Index: 12
#2Vaclav OcelikH-Index: 29
Last. Jeff Th. M. De HossonH-Index: 29
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Abstract Al0.7CoCrFeNi high entropy alloy (HEA) with a microstructure comprising strain free face-centered cubic (FCC) grains and strongly deformed sub-structured body centered cubic (BCC) grains was subjected to correlative nanoindentation testing, orientation imaging microscopy and local residual stress analysis. Depending on the geometry of BCC-FCC interface, certain boundaries indicated appearance of additional yield excursions apart from the typically observed elastic to plastic displacemen...
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#1I. BasuH-Index: 12
#2Vaclav OcelikH-Index: 29
Last. J.T.M. de HossonH-Index: 18
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Abstract The paper concentrates on the prediction of damage behavior in BCC HEAs and its subsequent dependence on intrinsic length scales. Size dependent plastic response is investigated using correlative nanomechanical testing, high resolution microscopy and phase analysis. Hot forged multiphase Al0.7CoCrFeNi HEA, comprising both face centered cubic (FCC) and body centered cubic (BCC) structured phases were used. Phase characterization inside the BCC grains indicated spinodal decomposition lead...
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#5Pengfei Yu (Yanshan University)H-Index: 19
#9Guoliang Li (Yanshan University)H-Index: 95
Abstract The semi-solid slurries of the CoCrCuFeNi high entropy alloy (HEA) were fabricated through the recrystallization and partial melting (RAP) process by cold-rolling and partial remelting. Based on Kim's theory, the solidus-liquidus temperature range and the fraction of the liquid phase as a function of temperature were examined from the Differential Scanning Calorimetry (DSC) curve. The effect of isothermal temperature and soaking time on the microstructural evolution of the CoCrCuFeNi HE...
Source
#1Xue Hui Yan (USTB: University of Science and Technology Beijing)H-Index: 1
#2Jinshan Li (NPU: Northwestern Polytechnical University)H-Index: 46
Last. Yong Zhang (USTB: University of Science and Technology Beijing)H-Index: 66
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Abstract High-entropy films are a new type of films which have been developed based on high-entropy alloys. It features many excellent properties, such as high strength and hardness with remarkable strain hardening rate, excellent wear and corrosion resistance, thermal stability, irradiation resistance, high toughness for wide-temperature range applications, etc., which traditional films are incomparable with. In recent years, high-entropy films have shown a fast development potential in various...
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#1Yanan Sun (SZU: Shenzhen University)H-Index: 1
#2Peng Chen (SZU: Shenzhen University)H-Index: 4
Last. Zhiyuan Liu (SZU: Shenzhen University)H-Index: 12
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Abstract With the addition of Al element, the microstructure of high entropy alloy AlxCoCrCuFeNi (x = 0.5, 1.5 and 3.0) changes from single FCC to FCC + BCC and then to single BCC phase. Hardness and elastic modulus of different phases in the HEAs are measured utilizing nanoindentation method. It is found that with the increase of the Al element, the hardness rises more significantly in the BCC phase than that in the FCC phase. The reason is attributed to that the Al element has a stronger solid...
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#1Z.H. Cao (Purdue University)H-Index: 2
#2M.Z. Wei (NU: Nanjing University)H-Index: 11
Last. Xiangkang Meng (NU: Nanjing University)H-Index: 38
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Abstract In this work, we have systematically investigated the effect of cyclic deformation on the strength and rate sensitivity of Cu/Ru multilayers with different individual layer thickness ( h ) by nanoindentation tests. It was found that cyclic deformation remarkably enhances the hardness of Cu/Ru multilayers comparing with the specimens by monotonic loading. The rate sensitivity ( m ) of multilayer exhibits an anomalous size dependence after nanoscale cyclic deformation. When h > 10 nm, the...
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#1Praveen Sathiyamoorthi (Indian Institute of Technology Madras)H-Index: 1
#2Joysurya Basu (IIT: Indian Institute of Technology (BHU) Varanasi)H-Index: 19
Last. Ravi Sankar Kottada (Indian Institute of Technology Madras)H-Index: 21
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Abstract Thermal stability of CoCrFeNi high entropy alloy in as-milled and sintered conditions was investigated using X-ray diffraction, differential scanning calorimetry, transmission electron microscopy, and atom probe tomography. Composite microstructure consists of FCC and carbide with a fine dispersion of oxide was observed in the sintered condition. Unsolicited contamination of carbon and oxygen in the as-milled powder due to the milling medium had led to the formation of composite microst...
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#1Satish I. Rao (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 28
#2Céline Varvenne (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 15
Last. William A. Curtin (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 81
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Abstract In this work, molecular statics and molecular dynamics simulations of a/2 dislocation behavior for a model FCC Co 30 Fe 16.67 Ni 36.67 Ti 16.67 alloy are discussed. It is shown that the single FCC phase is elastically stable in this alloy. Local stacking fault energies for the FCC alloy are determined as a function of average composition. The core structure of a/2 screw and edge dislocations in the FCC Co 30 Fe 16.67 Ni 36.67 Ti 16.67 alloy is shown to be planar with significant variati...
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#1Jiancun Rao (UMD: University of Maryland, College Park)H-Index: 23
#2Haoyan Diao (UT: University of Tennessee)H-Index: 13
Last. J.Th.M. De Hosson (UG: University of Groningen)H-Index: 72
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Secondary phases, either introduced by alloying or heat treatment, are commonly present in most high-entropy alloys (HEAs). Understanding the formation of secondary phases at high temperatures, and their effect on mechanical properties, is a critical issue that is undertaken in the present study, using the AlxCoCrFeNi (x = 0.3, 0.5, and 0.7) as a model alloy. The in-situ transmission-electron-microscopy (TEM) heating observation, an atom-probe-tomography (APT) study for the reference starting ma...
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Cited By37
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#1Young-Kyun Kim (Inha University)H-Index: 9
#2Min-Chul Kim (KAERI)H-Index: 13
Last. Kee-Ahn Lee (Inha University)H-Index: 19
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Abstract null null CrMnFeCoNi high-entropy alloys (HEAs) exhibit an excellent combination of tensile strength and ductility at cryogenic temperatures. This study led to the introduction of a new method for the development of high-performance CrMnFeCoNi HEAs at cryogenic temperatures by jointly utilizing additive manufacturing (AM) and the addition of interstitial atoms. The interstitial oxygen present in the powder feedstock was transformed into beneficial nano-sized oxides during AM processing....
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#1Qi Zhang (China University of Petroleum)H-Index: 6
#2Meiyan Li (China University of Petroleum)H-Index: 10
Last. Chunyang Hu (China University of Petroleum)H-Index: 3
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Abstract null null To investigate the effect of plastic deformation with high strain rate on the microstructure and properties of Al1.5CoCrFeMnNi high entropy coating, ultrasonic impact treatment (UIT) was applied on the surfaces of the cladding coatings. According to the results, before and after UIT, the phase composition of Al1.5CoCrFeMnNi cladding coating did not change, remaining FCC and BCC dual-phase structure. Enormous dislocations were produced and accumulated introducing a cumulative s...
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Abstract null null Heterogeneous phase interface with particular microstructure generally plays a key role in the mechanical behavior of nanostructured metals and alloys. Here, we reported a novel high-entropy phase interface with extraordinary property that is strongly dependent on the lattice mismatch and length scale in dual-phase high entropy alloys (DP-HEAs) multilayers. A disorder intermediate layer, fcc-to-amorphous and bcc-to amorphous transition sequentially take place in incoherent fcc...
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Abstract The crystal structure and physical properties of Nb25Mo5+xRe35Ru25-xRh10 (0 ≤ x ≤ 10) and Nb5Mo35-yRe15+yRu35Rh10 (0 ≤ y ≤ 15) high-entropy alloys (HEAs) have been studied by X-ray diffraction, electrical resistivity, magnetic susceptibility, and specific heat measurements. The results show that the former HEAs with valence electron concentration (VEC) values of 6.7-6.9 crystallize in a noncentrosymmetric cubic α-Mn structure, while the latter ones with VEC values of 7.1-7.25 adopt a ce...
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The introduction of carbon interstitials into high-entropy alloys (HEAs) provides an effective way to improve their properties. However, all such HEA systems explored so far are limited to those with the face-centered-cubic (fcc) structure. Here we report the structural, mechanical and physical properties of the refractory (Nb0.375Ta0.25Mo0.125W0.125Re0.125)100−xCx HEAs over a wide x range of 0 ≤ x ≤ 20. It is found that, whereas the starting HEA (x = 0) is composed of a major body-centered-cubi...
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#2Chunting Wang (CAS: Chinese Academy of Sciences)H-Index: 14
Last. Yongxiang Leng (Southwest Jiaotong University)H-Index: 34
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Abstract Dual-phase high entropy alloys have been proved to have the ability to overcome the strength-ductility trade-off. However, high-entropy alloy films are difficult to obtain a dual-phase structure due to the extremely high cooling rate during the preparation process and the high-entropy effect of the film itself. In this paper, the dual-phase CuNiTiNbCr high-entropy alloy films were prepared by high-power pulsed magnetron sputtering at different working pressures. The composition, microst...
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#1Z.H. Cao (Nanjing Tech University)H-Index: 8
#2Y.J. Ma (NU: Nanjing University)H-Index: 7
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Abstract Single phase coarse-grained medium entropy alloys (MEA) generally possess a low yield strength and high plasticity at macroscopic scale, but strain hardening/softening behavior of nanocrystalline MEA still remains unknown. Here we design and prepare the nanolamellar CoCrNi MEA with heterogeneous interfaces by inserting a hard Ta thin layer. Interestingly, the CoCrNi/Ta pillars have an excellent combination with high yield strength and large uniform plastic strain as compared to single p...
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#1An-Ni Wang (Technische Universität Ilmenau)H-Index: 8
#2Isabella GallinoH-Index: 19
Last. Peter SchaafH-Index: 47
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Abstract High entropy alloy films of AlCoCrFeNi B2-ordered structure are formed during an ultrafast heating process by reactive Ni/Al multilayers. The self-propagating high-temperature reaction occurring in reactive Ni/Al multilayers after ignition represents an ultrafast heat source which is used for the transformation of a thin films Al/CoFe/CrNi multilayer structure into a single-phase high entropy alloy film. The materials design of the combined multilayers thus determines the phase formatio...
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#1Bin Liu (Westlake University)H-Index: 1
#2Jifeng WuH-Index: 14
Last. Zhi RenH-Index: 6
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Abstract We report the structural and physical properties of the Ta10Mo35−xCrxRe35Ru20 high-entropy alloys (HEAs) with 5 ≤ x ≤ 13. These HEAs adopt a single tetragonal structure with the P42/mnm space group and show bulk Bardeen-Cooper-Schreiffer (BCS)-like superconductivity with the transition temperature Tc up to 4.79 K. In the normal-state, a paramagnetic behavior is observed at low temperature for all x values due to the magnetic moment of Cr, which is found to be about one-third that in Cr ...
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