Structural and mechanical properties of AlTiTaZr( N) medium entropy films (MEF) obtained by DC magnetron sputtering in dynamic mode

Garah, Mohamed El; Achache, Sofiane; Michau, Alexandre; Schuster, Frédéric; Sanchette, Frédéric

doi:10.1016/j.surfcoat.2020.125941

Cited by 15 publications

(3 citation statements)

References 53 publications

(54 reference statements)

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“…The formation of nitride solid-solution could be attributed to the high entropy effect, which by increasing solubility, limits the formation of intermetallic phases between nitrogen and metallic elements [9]. Similar nitride phases were found in other HEN coatings [8,9,14]. Besides the main phase, some small peaks of fcc phases with slightly different lattice parameters are also present.…”

Section: Crystallographic Structurementioning

confidence: 60%

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MAGNETRON SPUTTERING DEPOSITION OF HIGH ENTROPY NITRIDES FROM ChRomium-HaFnium-MOlybdenum-TAntalum-Wolfram SYSTEM

Stasiak

Souček

Buršı́ková

et al. 2021

NANOCON 2021 Conference Proeedings

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High entropy alloys (HEAs) are multicomponent materials with at least five elements close to the equiatomic ratio. The multielement composition leads to many effects that stabilize solid solution phases instead of intermetallic compounds. It results in promising mechanical properties, high thermal stability, good corrosion resistance, etc. After the discovery of HEAs in 2004, the concept only concerned metallic materials. Later, the idea was extended to high entropy ceramics (carbides, nitrides, oxides). In this study, the high entropy nitrides (HENs) from the Cr-Hf-Mo-Ta-W system were deposited by magnetron sputtering from elemental segmented targets. Two series of samples were deposited under different nitrogen flow from 0 sccm to 20 sccm at ambient temperature and 700 °C. The coatings deposited at low nitrogen flow consist predominantly of metallic and amorphous phases. At higher nitrogen flow (above 10 sccm), the coatings mainly consist of multielement facecentered cubic nitride with nanometric grain size, which lattice parameter increases with increasing nitrogen content. The chemical composition of films varies as a function of nitrogen flow and temperature. With increasing nitrogen flow and temperature, the deposition rate decreases from 67 nm min -1 at ambient temperature with no nitrogen to 38 nm min -1 at 700 °C under 20 sccm nitrogen flow. The coatings revealed high hardness up to 26.6 GPa and Young's modulus up to 531 GPa.

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Section: Crystallographic Structurementioning

confidence: 60%

“…Nevertheless, it is decreasing with increasing nitrogen flow. It can be a result of more severe partial poisoning of the targets [14].…”

Section: Figure 2 Sem Images Of the Cross Section Of Coatings Deposit...mentioning

confidence: 99%

MAGNETRON SPUTTERING DEPOSITION OF HIGH ENTROPY NITRIDES FROM ChRomium-HaFnium-MOlybdenum-TAntalum-Wolfram SYSTEM

Stasiak

Souček

Buršı́ková

et al. 2021

NANOCON 2021 Conference Proeedings

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“…15 It was speculated that HEANs containing the abovementioned elements would have good optical and thermodynamic properties. HEANs with superior thermal stability, such as (AlCrTaTiZrRu)N 0.7 , 31 AlTiTaZrN, 32 and VCrNb MoZrN, 33 have been extensively reported by many researchers. These studies demonstrated that HEANs can endure thermal treatment at 800 °C without considerable changes in the phase structures.…”

Section: Introductionmentioning

confidence: 99%

Highly Enhanced Thermal Robustness and Photothermal Conversion Efficiency of Solar-Selective Absorbers Enabled by High-Entropy Alloy Nitride MoTaTiCrN Nanofilms

Gao

et al. 2021

ACS Appl. Mater. Interfaces

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Recent advances in high-entropy alloys have spurred many breakthroughs in the fields of high-temperature materials and optical materials and they provide incredible application potentialities for photothermal conversion systems. Solar-selective absorbers (SSAs), as key components, play a vital role in photothermal conversion efficiency and service life. The most pressing problem with SSAs is their inconsistent optical performance, an instability constraint induced by thermal stress. A feasible method of improving performance stability is the introduction of high-entropy materials, such as high-entropy alloy nitrides. In this study, enabled by an intrinsic MoTaTiCrN absorption layer, the solar configuration achieves greatly enhanced, exceptional thermotolerance and optical properties, leading to the formation of a scalable, highly efficient, and costeffective structure. Computational and experimental approaches are employed to achieve optimum preparation parameters for thicknesses and constituents. The crystal structure of high-entropy ceramic MoTaTiCrN is fully investigated, including thicknessdependent crystal nucleation. High-temperature and long-term thermal stability tests demonstrate that our proposed SSA is mechanically robust and chemically stable. Moreover, a low thermal emittance (15.86%) at 500 °C promotes the photothermal conversion efficiency. In addition, due to the exceptional spectral selectivity (α/ε = 92.3/6.5%), thermal robustness (550 °C for 168 h), and photothermal conversion efficiency (86.9% at 550 °C under 100 sun), it is possible for our proposed SSA to enhance the practical realization of large-area photothermal conversion applications, especially for concentrated solar power systems.

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AlTiTaZr(-N) Medium-Entropy Films Deposited by Magnetron Sputtering with a Combinatorial Approach

Garah

Achache

Michau

et al. 2021

J. of Materi Eng and Perform

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Structural and mechanical properties of AlTiTaZr( N) medium entropy films (MEF) obtained by DC magnetron sputtering in dynamic mode

Cited by 15 publications

References 53 publications

MAGNETRON SPUTTERING DEPOSITION OF HIGH ENTROPY NITRIDES FROM ChRomium-HaFnium-MOlybdenum-TAntalum-Wolfram SYSTEM

MAGNETRON SPUTTERING DEPOSITION OF HIGH ENTROPY NITRIDES FROM ChRomium-HaFnium-MOlybdenum-TAntalum-Wolfram SYSTEM

Highly Enhanced Thermal Robustness and Photothermal Conversion Efficiency of Solar-Selective Absorbers Enabled by High-Entropy Alloy Nitride MoTaTiCrN Nanofilms

AlTiTaZr(-N) Medium-Entropy Films Deposited by Magnetron Sputtering with a Combinatorial Approach

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