High Strength and Deformation Mechanisms of Al0.3CoCrFeNi High-Entropy Alloy Thin Films Fabricated by Magnetron Sputtering

Liao, Wei-Bing; Zhang, Hongti; Liu, Zhi-Yuan; Li, Pei-Feng; Huang, Jian-Jun; Yu, Chun-Yan; Lu, Yang

doi:10.3390/e21020146

Title: High Strength and Deformation Mechanisms of A_l0.3CoCrFeNi High-Entropy Alloy Thin Films Fabricated by Magnetron Sputtering

Journal Article · 04 February 2019 · Entropy

DOI: https://doi.org/10.3390/e21020146 · OSTI ID:1614938

Liao, Wei-Bing ^[1]; Zhang, Hongti ^[2]; Liu, Zhi-Yuan ^[1]; Li, Pei-Feng ^[1]; Huang, Jian-Jun ^[1]; Yu, Chun-Yan ^[1];

^[3]

Shenzhen Univ. (China)
City Univ. of Hong Kong (China); Shanghai Tech Univ. (China)
City Univ. of Hong Kong (China); City Univ. of Hong Kong Shenzhen Research Inst. (China)

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.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)

Sponsoring Organization:: National Natural Science Foundation of China (NSFC); Youth Innovation Talent Project of Guangdong Province; Shenzhen University; Shenzhen Science and Technology Innovation Committee

OSTI ID:: 1614938

Journal Information:: Entropy, Journal Name: Entropy Journal Issue: 2 Vol. 21; ISSN 1099-4300

Publisher:: MDPICopyright Statement

Country of Publication:: United States

Language:: ENGLISH

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Constitutive modeling and strain hardening of CoCrFeNiAl _x high-entropy alloys Zhao, Dan; Fang, Huiqing; Jin, Tao Materials Research Express, Vol. 6, Issue 10 https://doi.org/10.1088/2053-1591/ab42e8	journal	September 2019

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Title: High Strength and Deformation Mechanisms of Al0.3CoCrFeNi High-Entropy Alloy Thin Films Fabricated by Magnetron Sputtering

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Title: High Strength and Deformation Mechanisms of A_l0.3CoCrFeNi High-Entropy Alloy Thin Films Fabricated by Magnetron Sputtering