Oxidation of amorphous HfNbTaTiZr high entropy alloy thin films prepared by DC magnetron sputtering

2020 ◽  
pp. 157978
Author(s):  
Petr Hruška ◽  
František Lukáč ◽  
Stanislav Cichoň ◽  
Martin Vondráček ◽  
Jakub Čížek ◽  
...  
Entropy ◽  
2019 ◽  
Vol 21 (2) ◽  
pp. 146 ◽  
Author(s):  
Wei-Bing Liao ◽  
Hongti Zhang ◽  
Zhi-Yuan Liu ◽  
Pei-Feng Li ◽  
Jian-Jun Huang ◽  
...  

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 Al0.3CoCrFeNi 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.


2015 ◽  
Vol 580 ◽  
pp. 71-76 ◽  
Author(s):  
B.R. Braeckman ◽  
F. Boydens ◽  
H. Hidalgo ◽  
P. Dutheil ◽  
M. Jullien ◽  
...  

2019 ◽  
Vol 797 ◽  
pp. 834-841 ◽  
Author(s):  
Young Seok Kim ◽  
Hae Jin Park ◽  
Sang Chul Mun ◽  
Elyorjon Jumaev ◽  
Sung Hwan Hong ◽  
...  

2017 ◽  
Vol 4 (5) ◽  
pp. 6311-6316 ◽  
Author(s):  
Pongladda Panyajirawut ◽  
Nattha Pratumsuwan ◽  
Kornkamon Meesombad ◽  
Kridsana Thanawattana ◽  
Artit Chingsungnoen ◽  
...  

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Chokkakula L. P. Pavithra ◽  
Reddy Kunda Siri Kiran Janardhana ◽  
Kolan Madhav Reddy ◽  
Chandrasekhar Murapaka ◽  
Joydip Joardar ◽  
...  

AbstractDiscovery of advanced soft-magnetic high entropy alloy (HEA) thin films are highly pursued to obtain unidentified functional materials. The figure of merit in current nanocrystalline HEA thin films relies in integration of a simple single-step electrochemical approach with a complex HEA system containing multiple elements with dissimilar crystal structures and large variation of melting points. A new family of Cobalt–Copper–Iron–Nickel–Zinc (Co–Cu–Fe–Ni–Zn) HEA thin films are prepared through pulse electrodeposition in aqueous medium, hosts nanocrystalline features in the range of ~ 5–20 nm having FCC and BCC dual phases. The fabricated Co–Cu–Fe–Ni–Zn HEA thin films exhibited high saturation magnetization value of ~ 82 emu/g, relatively low coercivity value of 19.5 Oe and remanent magnetization of 1.17%. Irrespective of the alloying of diamagnetic Zn and Cu with ferromagnetic Fe, Co, Ni elements, the HEA thin film has resulted in relatively high saturation magnetization which can provide useful insights for its potential unexplored applications.


Vacuum ◽  
2021 ◽  
Vol 188 ◽  
pp. 110200
Author(s):  
Sihui Wang ◽  
Wei Wei ◽  
Yonghao Gao ◽  
Haibin Pan ◽  
Yong Wang

Vacuum ◽  
2020 ◽  
Vol 177 ◽  
pp. 109355
Author(s):  
Nils Nedfors ◽  
Daniel Primetzhofer ◽  
Igor Zhirkov ◽  
Justinas Palisaitis ◽  
Per O.Å. Persson ◽  
...  

1992 ◽  
Vol 61 (3) ◽  
pp. 348-350 ◽  
Author(s):  
Y. Z. Zhang ◽  
L. Li ◽  
Y. Y. Zhao ◽  
B. R. Zhao ◽  
J. W. Li ◽  
...  

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