Effect of high entropy alloys TiVCrZrHf barrier layer on microstructure and texture of Cu thin films

2018 ◽  
Vol 230 ◽  
pp. 5-8
Author(s):  
Xiaowen Peng ◽  
Leng Chen
Keyword(s):  
Thin Films ◽  
Barrier Layer ◽  
High Entropy Alloys ◽  
High Entropy

Tailoring phase transformation strengthening and plasticity of nanostructured high entropy alloys

Nanoscale ◽  
2020 ◽  
Vol 12 (26) ◽  
pp. 14135-14149
Author(s):  
Y. F. Zhao ◽  
X. B. Feng ◽  
J. Y. Zhang ◽  
Y. Lu ◽  
S. H. Wu ◽  
...  
Keyword(s):  
Thin Films ◽  
Phase Transformation ◽  
High Entropy Alloys ◽  
High Entropy ◽  
Phase Transformation Strengthening

Phase transformation strengthening and plasticity of nanostructured FeCoCrNi thin films can be tailored utilizing constraining effects. The transformation occurs only in FeCoCrNi/Ni nanolaminates with large h while not in FeCoCrNi/Ni.

scholarly journals The Microstructures and Electrical Resistivity of (Al, Cr, Ti)FeCoNiOxHigh-Entropy Alloy Oxide Thin Films

2015 ◽  
Vol 2015 ◽  
pp. 1-6 ◽  
Author(s):  
Chun-Huei Tsau ◽  
Zhang-Yan Hwang ◽  
Swe-Kai Chen
Keyword(s):  
Thin Films ◽  
Oxide Films ◽  
Annealing Treatment ◽  
Metallic Alloys ◽  
Vacuum Furnace ◽  
High Entropy Alloys ◽  
Oxide Thin Films ◽  
Metal Oxide Films ◽  
High Entropy ◽  
Feconi Alloy

The (Al, Cr, Ti)FeCoNi alloy thin films were deposited by PVD and using the equimolar targets with same compositions from the concept of high-entropy alloys. The thin films became metal oxide films after annealing at vacuum furnace for a period; and the resistivity of these thin films decreased sharply. After optimum annealing treatment, the lowest resistivity of the FeCoNiOx, CrFeCoNiOx, AlFeCoNiOx, and TiFeCoNiOxfilms was 22, 42, 18, and 35 μΩ-cm, respectively. This value is close to that of most of the metallic alloys. This phenomenon was caused by delaminating of the alloy oxide thin films because the oxidation was from the surfaces of the thin films. The low resistivity of these oxide films was contributed to the nonfully oxidized elements in the bottom layers and also vanishing of the defects during annealing.

Property-Targeted Design of High-Entropy Alloys Based on Tailoring Through Solid-State Alloying from Multilayer Thin Films

2020 ◽  
Author(s):  
Seungjin Nam ◽  
Sang Jun Kim ◽  
Kook Noh Yoon ◽  
Moon J. Kim ◽  
Manuel Quevedo-Lopez ◽  
...  
Keyword(s):  
Thin Films ◽  
Solid State ◽  
High Entropy Alloys ◽  
Multilayer Thin Films ◽  
High Entropy

scholarly journals Kinetically Limited Phase Formation of Pt-Ir Based Compositionally Complex Thin Films

Materials ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2298
Author(s):  
Aparna Saksena ◽  
Dimitri Bogdanovski ◽  
Hrushikesh Sahasrabuddhe ◽  
Denis Music ◽  
Jochen M. Schneider
Keyword(s):  
Thin Films ◽  
Activation Energy ◽  
Surface Diffusion ◽  
Phase Formation ◽  
Single Phase ◽  
Configurational Entropy ◽  
High Entropy Alloys ◽  
X Ray ◽  
High Entropy ◽  
Two Phases

The phase formation of PtIrCuAuX (X = Ag, Pd) compositionally complex thin films is investigated to critically appraise the criteria employed to predict the formation of high entropy alloys. The formation of a single-phase high entropy alloy is predicted if the following requirements are fulfilled: 12 J∙K−1 mol−1 ≤ configurational entropy ≤ 17.5 J∙K−1 mol−1, −10 kJ∙mol−1 ≤ enthalpy of mixing ≤ 5 kJ∙mol−1 and atomic size difference ≤ 5%. Equiatomic PtIrCuAuX (X = Ag, Pd) fulfill all of these requirements. Based on X-ray diffraction and energy-dispersive X-ray spectroscopy data, near-equiatomic Pt22Ir23Cu18Au18Pd19 thin films form a single-phase solid solution while near-equiatomic Pt22Ir23Cu20Au17Ag18 thin films exhibit the formation of two phases. The latter observation is clearly in conflict with the design rules for high entropy alloys. However, the observed phase formation can be rationalized by considering bond strengths and differences in activation energy barriers for surface diffusion. Integrated crystal orbital Hamilton population values per bond imply a decrease in bond strength for all the interactions when Pd is substituted by Ag in PtIrCuAuX which lowers the surface diffusion activation energy barrier by 35% on average for each constituent. This enables the surface diffusion-mediated formation of two phases, one rich in Au and Ag and a second phase enriched in Pt and Cu. Hence, phase formation in these systems appears to be governed by the complex interplay between energetics and kinetic limitations rather than by configurational entropy.

High-Entropy Alloys as Catalysts for the CO2 and CO Reduction Reactions

2019 ◽  
Author(s):  
Jack Pedersen ◽  
Thomas Batchelor ◽  
Alexander Bagger ◽  
Jan Rossmeisl
Keyword(s):  
Density Functional ◽  
Rational Design ◽  
Hydrogen Adsorption ◽  
Co Adsorption ◽  
Reduction Reaction ◽  
Supervised Machine Learning ◽  
High Entropy Alloys ◽  
High Entropy ◽  
Co Reduction ◽  
Disordered Alloy

Using the high-entropy alloys (HEAs) CoCuGaNiZn and AgAuCuPdPt as starting points we provide a framework for tuning the composition of disordered multi-metallic alloys to control the selectivity and activity of the reduction of carbon dioxide (CO2) to highly reduced compounds. By combining density functional theory (DFT) with supervised machine learning we predicted the CO and hydrogen (H) adsorption energies of all surface sites on the (111) surface of the two HEAs. This allowed an optimization for the HEA compositions with increased likelihood for sites with weak hydrogen adsorption{to suppress the formation of molecular hydrogen (H2) and with strong CO adsorption to favor the reduction of CO. This led to the discovery of several disordered alloy catalyst candidates for which selectivity towards highly reduced carbon compounds is expected, as well as insights into the rational design of disordered alloy catalysts for the CO2 and CO reduction reaction.

Effect of the structure of vacuum condensates of high entropy alloys of Cr–Fe–Co–Ni–Cu system on their mechanical properties

2020 ◽  
Vol 2020 (4) ◽  
pp. 16-22
Author(s):  
A.I. Ustinov ◽  
◽  
V.S. Skorodzievskii ◽  
S.A. Demchenkov ◽  
S.S. Polishchuk ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
High Entropy Alloys ◽  
High Entropy ◽  
Vacuum Condensates
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