Combinatorial synthesis of high entropy alloys: Introduction of a novel, single phase, body-centered-cubic FeMnCoCrAl solid solution

Marshal, Amalraj; Pradeep, Konda Gokuldoss; Mušić, Denis; Zaefferer, Stefan; De, Partha Sarathi; Schneider, Jochen M.

doi:10.1016/j.jallcom.2016.08.326

Cited by 64 publications

(26 citation statements)

References 43 publications

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“…In these cases, the HEATFs will play an important role. The initial research of HEATFs is associated with the recent rapid development of HEAs and the high throughput preparation idea [ 22 , 23 , 24 , 25 , 26 ]. As the geometric size and microstructures of the thin films are different from the three-dimensional bulk samples, their performances under loading and service conditions could be completely different [ 27 , 28 ].…”

Section: Introductionmentioning

confidence: 99%

High Strength and Deformation Mechanisms of Al0.3CoCrFeNi High-Entropy Alloy Thin Films Fabricated by Magnetron Sputtering

Liao

Zhang

Liu

et al. 2019

Entropy

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Recently, high-entropy alloy thin films (HEATFs) with nanocrystalline structures and high hardness were developed by magnetron sputtering technique and have exciting potential to make small structure devices and precision instruments with sizes ranging from nanometers to micrometers. However, the strength and deformation mechanisms are still unclear. In this work, nanocrystalline Al 0.3 CoCrFeNi HEATFs with a thickness of~4 µm were prepared. The microstructures of the thin films were comprehensively characterized, and the mechanical properties were systematically studied. It was found that the thin film was smooth, with a roughness of less than 5 nm. The chemical composition of the high entropy alloy thin film was homogeneous with a main single face-centered cubic (FCC) structure. Furthermore, it was observed that the hardness and the yield strength of the high-entropy alloy thin film was about three times that of the bulk samples, and the plastic deformation was inhomogeneous. Our results could provide an in-depth understanding of the mechanics and deformation mechanism for future design of nanocrystalline HEATFs with desired properties.

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Section: Introductionmentioning

confidence: 99%

High Strength and Deformation Mechanisms of Al0.3CoCrFeNi High-Entropy Alloy Thin Films Fabricated by Magnetron Sputtering

Liao

Zhang

Liu

et al. 2019

Entropy

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“…However, the previously discussed ambiguity regarding the phase stability of Pt-Ir solid solutions may also be relevant in the context of precision glass molding motivating the here reported combinatorial phase formation investigation utilizing in addition to standard structure and composition analysis also atom probe tomography to determine the local chemical composition and potential variations thereof at the nm scale. Combinatorial depositions in combination with modern electronic structure predictions have previously been demonstrated to be an efficient method for rapid screening for binary alloys 31 , 32 as well as for high entropy alloys 33 regarding phase formation and phase stability.…”

Section: Introductionmentioning

confidence: 99%

Metastable phase formation of Pt-X (X = Ir, Au) thin films

Saksena

Chien

Chang

et al. 2018

Sci Rep

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The dependence of phase formation and mechanical properties on the chemical composition has been investigated for Pt-Ir and Pt-Au combinatorial thin films. The formation of a single, metastable Pt-Ir solid solution has been observed for all experimental compositions and temperatures. Upon Ir addition to Pt the experimentally determined changes in lattice parameter and Young’s modulus display rule of mixture behavior which is in good agreement with our ab initio data. Whereas, in the Pt-Au system, the single metastable solid solution decomposes into two phases as the growth temperature is raised to ≥600 °C. The lattice parameters in the dual phase region are independent of chemical composition. The substrate temperature and chemical composition dependent phase formation in Pt-Ir and Pt-Au thin films can be rationalized based on CALPHAD (CALculation of PHAse Diagrams) results combined with estimations of the activation energy required for surface diffusion: The metastable phase formation during film growth is caused by kinetic limitations, where Ir atoms (in Pt-Ir) need to overcome an up to factor 6 higher activation energy barrier than Au (in Pt-Au) to enable surface diffusion.

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“…Even though these methods are required to gain important insights into the complex microstructures, sample preparation, especially for TEM and APT, is time consuming. Moreover, the large compositional space of these new class of multi-principal element alloys also requires new, high throughput approaches, which can accelerate the discovery and development of alloy compositions with interesting and promising material properties [22][23][24] especially when a single-phase character for a certain application temperature is targeted. Therefore, a simple method would be beneficial that allows a faster and reliable screening and evaluation of possible decomposition effects in single-phase HE-alloys before advanced microstructural analysis methods are applied.…”

Section: Introductionmentioning

confidence: 99%

Nanoindentation testing as a powerful screening tool for assessing phase stability of nanocrystalline high-entropy alloys

et al. 2017

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The equiatomic high-entropy alloy (HEA), CrMnFeCoNi, has recently been shown to be microstructurally unstable, resulting in a multi-phase microstructure after intermediate-temperature annealing treatments. The decomposition occurs rapidly in the nanocrystalline (NC) state and after longer annealing times in coarse-grained states. To characterize the mechanical properties of differently annealed NC states containing multiple phases, nanoindentation was used. The results revealed besides drastic changes in hardness, also for the first time significant changes in the Young's modulus and strain rate sensitivity. Nanoindentation of NC HEAs is, therefore, a useful complementary screening tool with high potential as a high throughput approach to detect phase decomposition, which can also be used to qualitatively predict the long-term stability of single-phase HEAs.

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Combinatorial synthesis of high entropy alloys: Introduction of a novel, single phase, body-centered-cubic FeMnCoCrAl solid solution

Cited by 64 publications

References 43 publications

High Strength and Deformation Mechanisms of Al0.3CoCrFeNi High-Entropy Alloy Thin Films Fabricated by Magnetron Sputtering

High Strength and Deformation Mechanisms of Al0.3CoCrFeNi High-Entropy Alloy Thin Films Fabricated by Magnetron Sputtering

Metastable phase formation of Pt-X (X = Ir, Au) thin films

Nanoindentation testing as a powerful screening tool for assessing phase stability of nanocrystalline high-entropy alloys

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