Structure formation and properties of sputter deposited Nbx-CoCrCuFeNi high entropy alloy thin films

Braeckman, Bert; Depla, Diederik

doi:10.1016/j.jallcom.2015.06.097

Cited by 60 publications

(28 citation statements)

References 41 publications

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“…These are focussed on mechanical properties [4][5][6], structure and morphology [7], electrical properties [8], and magnetic properties [9]. There has been a particular focus on thin films of the HEA CrFeCoNiCu, with [10][11][12][13][14][15] or without a sixth component [16,17].…”

Section: Introductionmentioning

confidence: 99%

Thin films of AlCrFeCoNiCu high-entropy alloy by pulsed laser deposition

Cropper

2018

Applied Surface Science

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Pulsed laser deposition has been used to prepare thin films of the high entropy alloy AlCrFeCoNiCu. The 35 nm films were deposited in ultra-high vacuum onto glass at room temperature and above and analysed using X-ray diffraction and X-ray photoelectron spectroscopy. Films deposited at room temperature exhibit a mix of FCC and BCC reflections, the FCC crystallites having size similar to the film thickness, but the BCC crystallites are larger. The intensity of the reflections from both crystal structures reduce with increasing deposition temperature, the fall in BCC commencing at lower temperature than the FCC associated with a reduction of the content of Al and Cu. X-ray photoelectron spectroscopy shows that the films deposited at room temperature are closer to stoichiometry than those at higher temperatures. An important feature of the X-ray photoelectron spectroscopy depth profiles is surface segregation, the outer 3 nm of the high entropy alloy films has higher concentration of Al and, to a lesser extent, Cr. Highlights • The films exhibit mixed FCC and BCC structure. • With increasing deposition temperature, FCC and BCC reflections reduce associated with loss of Al and Cu. • Surface segregation enriches the surface of the films in Al and to a lesser extent Cr.

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Section: Introductionmentioning

confidence: 99%

Thin films of AlCrFeCoNiCu high-entropy alloy by pulsed laser deposition

Cropper

2018

Applied Surface Science

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“…However, with the rapid advancement of sputtering techniques, HEA film fabricated at nanoscale can now be employed as the optimal coating material. [23,32,33] Likewise, Lee et al has used the sputtering technique to successfully manufacture metallic glass nanolattices. [19] Additionally, the flexibility of two-photon lithography (TPL) allows countless number of different lattices with several orders of hierarchy and sizes to be fabricated.…”

Section: Introductionmentioning

confidence: 99%

High‐Entropy Alloy (HEA)‐Coated Nanolattice Structures and Their Mechanical Properties

et al. 2017

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Nanolattice structure fabricated by two-photon lithography (TPL) is a coupling of size-dependent mechanical properties at micro/nano-scale with structural geometry responses in wide applications of scalable micro/nano-manufacturing. In this work, three-dimensional (3D) polymeric nanolattices are initially fabricated using TPL, then conformably coated with an 80 nm thick high-entropy alloy (HEA) thin film (CoCrFeNiAl 0.3 ) via physical vapor deposition (PVD). 3D atomic-probe tomography (APT) reveals the homogeneous element distribution in the synthesized HEA film deposited on the substrate. Mechanical properties of the obtained composite architectures are investigated via in situ scanning electron microscope (SEM) compression test, as well as finite element method (FEM) at the relevant length scales. The presented HEA-coated nanolattice encouragingly not only exhibits superior compressive specific strength of %0.032 MPa kg À1 m 3 with density well below 1000 kg m À3 , but also shows good compression ductility due to its composite nature. This concept of combining HEA with polymer lattice structures demonstrates the potential of fabricating novel architected metamaterials with tunable mechanical properties.

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“…It is generally believed that the increase of the aluminum content favors the FCC to BCC phase transition, which can be mainly explained by two arguments [70]. First, the incorporation of Al atoms into the FCC lattice increases the lattice distortion whereas the BCC lattice has a lower packing fraction and is more open to accommodate the larger Al atoms.…”

Section: Hea Films and Coatingsmentioning

confidence: 99%

“…Braeckman et al [70] investigated the structural evolution of NbCoCrCuFeNi films with the increase of the niobium concentration deposited by magnetron sputtering. They found that the films changed from a crystalline FCC structure without the Nb addition to an amorphous (or nanocrystalline) structure for higher Nb fractions, as shown in Figure 5, which could be attributed to the largest radius of Nb among all constituent elements.…”

Section: Hea Films and Coatingsmentioning

confidence: 99%

Microstructures and properties of high-entropy alloy films and coatings: a review

Liu

Liaw

2018

Materials Research Letters

425

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In the past 14 years, as a branch of high-entropy alloy (HEA) materials, HEA films and coatings have exhibited the attractive and unique properties, relative to the conventional film and coating materials. The recent research and development of HEA films and coatings are reviewed in this paper. At first, the basic concept of HEAs films and coatings are introduced. Then, their preparation technologies, microstructures and appealing properties are summarized. Moreover, the possible reasons and design criteria for achieving the excellent properties are discussed. Finally, the suggested future research work for the HEA films and coatings are outlined. IMPACT STATEMENT Preparation technologies, microstructures, and properties of HEA films and coatings are reviewed in this paper. The design criteria and suggested research directions are further discussed and proposed.

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Structure formation and properties of sputter deposited Nbx-CoCrCuFeNi high entropy alloy thin films

Cited by 60 publications

References 41 publications

Thin films of AlCrFeCoNiCu high-entropy alloy by pulsed laser deposition

Thin films of AlCrFeCoNiCu high-entropy alloy by pulsed laser deposition

High‐Entropy Alloy (HEA)‐Coated Nanolattice Structures and Their Mechanical Properties

Microstructures and properties of high-entropy alloy films and coatings: a review

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