Next Article in Journal
An Information-Theoretic Framework for Evaluating Edge Bundling Visualization
Next Article in Special Issue
Tensile Behavior and Evolution of the Phases in the Al10Co25Cr8Fe15Ni36Ti6 Compositionally Complex/High Entropy Alloy
Previous Article in Journal
Examining the Schelling Model Simulation through an Estimation of Its Entropy
Previous Article in Special Issue
Microstructure and Mechanical Properties of Particulate Reinforced NbMoCrTiAl High Entropy Based Composite
Open AccessArticle

Effects of Nitrogen Content on the Structure and Mechanical Properties of (Al0.5CrFeNiTi0.25)Nx High-Entropy Films by Reactive Sputtering

1
State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China
2
College of Physics and Energy, Shenzhen University, Shenzhen 518060, China
3
Department of Physics, School of Science, Hebei University of Science and Technology, Shijiazhuang 050000, China
*
Author to whom correspondence should be addressed.
Entropy 2018, 20(9), 624; https://doi.org/10.3390/e20090624
Received: 9 July 2018 / Revised: 10 August 2018 / Accepted: 19 August 2018 / Published: 21 August 2018
(This article belongs to the Special Issue New Advances in High-Entropy Alloys)
In this study, (Al0.5CrFeNiTi0.25)Nx high-entropy films are prepared by a reactive direct current (DC) magnetron sputtering at different N2 flow rates on silicon wafers. It is found that the structure of (Al0.5CrFeNiTi0.25)Nx high-entropy films is amorphous, with x = 0. It transforms from amorphous to a face-centered-cubic (FCC) structure with the increase of nitrogen content, while the bulk Al0.5CrFeNiTi0.25 counterpart prepared by casting features a body-centered-cubic (BCC) phase structure. The phase formation can be explained by the atomic size difference (δ). Lacking nitrogen, δ is approximately 6.4% for the five metal elements, which is relatively large and might form a BCC or ordered-BCC structure, while the metallic elements in this alloy system all have a trend to form nitrides like TiN, CrN, AlN, and FeN. Therefore, nitride components are becoming very similar in size and structure and solve each other easily, thus, an FCC (Al-Cr-Fe-Ni-Ti)N solid solution forms. The calculated value of δ is approximately 23% for this multicomponent nitride solid solution. The (Al0.5CrFeNiTi0.25)Nx films achieve a pronounced hardness and a Young’s modulus of 21.45 GPa and 253.8 GPa, respectively, which is obviously much higher than that of the as-cast Al0.5CrFeNiTi0.25 bulk alloys. View Full-Text
Keywords: high-entropy films; phase structures; hardness; solid-solution; interstitial phase high-entropy films; phase structures; hardness; solid-solution; interstitial phase
Show Figures

Graphical abstract

MDPI and ACS Style

Zhang, Y.; Yan, X.-H.; Liao, W.-B.; Zhao, K. Effects of Nitrogen Content on the Structure and Mechanical Properties of (Al0.5CrFeNiTi0.25)Nx High-Entropy Films by Reactive Sputtering. Entropy 2018, 20, 624.

Show more citation formats Show less citations formats
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

1
Back to TopTop