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Type: Journal article
Title: Fatigue resistance of nanotwinned high-entropy alloy films
Author: Huo, W.
Fang, F.
Liu, X.
Tan, S.
Xie, Z.
Jiang, J.
Citation: Materials Science and Engineering A, 2019; 739:26-30
Publisher: Elsevier
Issue Date: 2019
ISSN: 0921-5093
Statement of
Wenyi Huo, Feng Fang, Xiaodong Liu, Shuyong Tan, Zonghan Xie, Jianqing Jiang
Abstract: Nanotwinned nanocrystalline CoCrFeNi high-entropy alloy films were prepared by magnetron sputtering. A disordered face-centered cubic structure was identified, with a uniform distribution of chemical elements. Both <1 1 0> out-of-plane and <1 1 1> in-plane textures were also observed in the nanotwinned film with a thickness of 2.98 µm. The fatigue resistance of the films was analyzed by nanoindentation technique with up to 10³ cycles under various impact energies, complemented by post-test atomic force microscopy investigation of indentation craters. Unlike coarse-grained samples, the nanotwinned films exhibited excellent fatigue resistance, characterized by history-independent and near-stable fatigue responses. Under the influence of the textures developed in the films, the nanotwin planes were oriented toward the loading direction under each fatigue cycle. As such, extremely stable correlated necklace dislocations structure formed and moved back and forth along the twin boundaries during cyclic loading, which preserved the slip systems as well as the coherency and stability of twin boundaries.
Keywords: High-entropy alloy; nanocrystalline; nanotwins; nanotwinned films; nanofatigue
Rights: © 2018 Elsevier B.V. All rights reserved.
RMID: 0030100645
DOI: 10.1016/j.msea.2018.09.112
Appears in Collections:Mechanical Engineering publications

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