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Journal of Materials Engineering and Performance

Erschienen in:

05.05.2016

Effect of Strain Rate on Deformation Behavior of AlCoCrFeNi High-Entropy Alloy by Nanoindentation

verfasst von: L. Tian, Z. M. Jiao, G. Z. Yuan, S. G. Ma, Z. H. Wang, H. J. Yang, Y. Zhang, J. W. Qiao

Erschienen in: Journal of Materials Engineering and Performance | Ausgabe 6/2016

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Abstract

In this study, nanoindentation tests with continuous stiffness measurement technique were measured to investigate the deformation behavior of a high-entropy alloy AlCoCrFeNi under different indentation strain rates at room temperature. Results suggest that the creep behavior exhibits remarkable strain rate dependence. In-situ scanning images showed a conspicuous pileup around the indents, indicating that an extremely localized plastic deformation occurred during the nanoindentation. Under different strain rates, elastic modulus basically remains unchanged, while the hardness decreases with increasing indentation depth due to the indentation size effect. Furthermore, the modulus and hardness of AlCoCrFeNi HEAs are greater than that of the Al_xCoCrFeNi (x = 0.3,0.5) at the strain rate of 0.2 s⁻¹ due to its higher negative enthalpy of mixing related to the atomic binding force, and the solid solution strengthening induced by the lattice distortion, respectively.

Vorheriger Artikel Microstructure and Corrosion Behavior of Hot-Deformed and Cold-Strained High-Mn Steels

Nächster Artikel Properties of Light MMCs Modified with Cordierite Synthesized from Fly Ash

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Titel: Effect of Strain Rate on Deformation Behavior of AlCoCrFeNi High-Entropy Alloy by Nanoindentation
verfasst von: L. Tian
Z. M. Jiao
G. Z. Yuan
S. G. Ma
Z. H. Wang
H. J. Yang
Y. Zhang
J. W. Qiao
Publikationsdatum: 05.05.2016
Verlag: Springer US
Erschienen in: Journal of Materials Engineering and Performance / Ausgabe 6/2016
Print ISSN: 1059-9495
Elektronische ISSN: 1544-1024
DOI: https://doi.org/10.1007/s11665-016-2082-8

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