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Entropy 2014, 16(1), 405-417; doi:10.3390/e16010405
Article

Nanomechanical Properties and Deformation Behaviors of Multi-Component (AlCrTaTiZr)NxSiy High-Entropy Coatings

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Received: 27 September 2013; in revised form: 20 November 2013 / Accepted: 18 December 2013 / Published: 31 December 2013
(This article belongs to the Special Issue High Entropy Alloys)
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Abstract: In this study multi-component (AlCrTaTiZr)NxSiy high-entropy coatings were developed by co-sputtering of AlCrTaTiZr alloy and Si in an Ar/N2 mixed atmosphere with the application of different substrate biases and Si-target powers. Their nanomechanical properties and deformation behaviors were characterized by nanoindentation tests. Because of the effect of high mixing entropies, all the deposited multi-component (AlCrTaTiZr)NxSiy high-entropy coatings exhibited a simple face-centered cubic solid-solution structure. With an increased substrate bias and Si-target power, their microstructures changed from large columns with a [111] preferred orientation to a nanocomposite form with ultrafine grains. The hardness, H/E ratio and H3/E2 ratio of (AlCrTaTiZr)N1.07Si0.15 coating reached 30.2 GPa, 0.12 and 0.41 GPa, respectively, suggesting markedly suppressed dislocation activities and a very high resistance to wear and plastic deformation, attributable to grain refinements and film densification by the application of substrate bias, a nanocomposite structure by the introduction of silicon nitrides, and a strengthening effect induced by severe lattice distortions. In the deformed regions under indents, stacking faults or partial dislocations were formed, while in the stress-released regions, near-perfect lattices recovered.
Keywords: multi-component; high-entropy alloy; nanomechanical property; deformation multi-component; high-entropy alloy; nanomechanical property; deformation
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Lin, S.-Y.; Chang, S.-Y.; Chang, C.-J.; Huang, Y.-C. Nanomechanical Properties and Deformation Behaviors of Multi-Component (AlCrTaTiZr)NxSiy High-Entropy Coatings. Entropy 2014, 16, 405-417.

AMA Style

Lin S-Y, Chang S-Y, Chang C-J, Huang Y-C. Nanomechanical Properties and Deformation Behaviors of Multi-Component (AlCrTaTiZr)NxSiy High-Entropy Coatings. Entropy. 2014; 16(1):405-417.

Chicago/Turabian Style

Lin, Shao-Yi; Chang, Shou-Yi; Chang, Chia-Jung; Huang, Yi-Chung. 2014. "Nanomechanical Properties and Deformation Behaviors of Multi-Component (AlCrTaTiZr)NxSiy High-Entropy Coatings." Entropy 16, no. 1: 405-417.


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