Effects of Y Additions on the Microstructure and Mechanical Properties of CoCr1.7Ni Medium-Entropy Alloys

Zhou, Shaoshuai; Shu, Xiaoyong; Hu, Linli; Yuan, Xunyu; Qiu, Panpan; Xu, Xiwen

doi:10.3390/cryst15020172

Open AccessArticle

Effects of Y Additions on the Microstructure and Mechanical Properties of CoCr_1.7Ni Medium-Entropy Alloys

by

Shaoshuai Zhou

¹

,

Xiaoyong Shu

^1,*,

Linli Hu

²,

Xunyu Yuan

¹,

Panpan Qiu

¹ and

Xiwen Xu

¹

Jiangxi Provincial Engineering Research Center for Surface Technology of Aeronautical Materials, Nanchang Hangkong University, Nanchang 330063, China

²

School of Mechanical Engineering, Jiangxi Vocational College of Mechanical and Electrical Technology, Nanchang 330013, China

^*

Author to whom correspondence should be addressed.

Crystals 2025, 15(2), 172; https://doi.org/10.3390/cryst15020172

Submission received: 24 December 2024 / Revised: 4 February 2025 / Accepted: 7 February 2025 / Published: 10 February 2025

(This article belongs to the Special Issue Advances in Processing, Simulation and Characterization of Alloys)

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Abstract

In order to improve the room temperature yield strength of X and enhance its engineering applicability, a series of CoCr_1.7NiY_x (x = 0, 0.01, 0.02, 0.03, 0.04, and 0.1 at.%) medium-entropy alloys were synthesized to investigate the effect of Y addition on the microstructures and mechanical properties of the CoCr_1.7Ni-based alloy. The X-ray diffraction results show that the alloys exhibit face-centered cubic (FCC) + body-centered cubic (BCC) + hexagonal close packing (HCP) triphasic structure when the Y is adopted, whereas the CoCr_1.7Ni-based alloy has a FCC+BCC biphasic structure. The volume fraction of BCC and HCP phase increased with increasing Y content, which led to alloy grain refinement. As a result, the microhardness and strength of alloys were both enhanced. The addition of Y resulted in dispersion strengthening and solid solution strengthening of CoCr_1.7Ni alloy, the appearance of HCP, and an increase in BCC, which improved the room temperature yield strength and hardness of CoCr_1.7Ni alloy. In particular, for CoCr_1.7NiY_0.1 alloy, its microhardness and yield strength, respectively, increased by 98.18% and 260.59% as compared with those of CoCr_1.7Ni alloy.

Keywords: medium-entropy alloys; rare earth element; yttrium addition; microstructure; mechanical properties

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MDPI and ACS Style

Zhou, S.; Shu, X.; Hu, L.; Yuan, X.; Qiu, P.; Xu, X. Effects of Y Additions on the Microstructure and Mechanical Properties of CoCr_1.7Ni Medium-Entropy Alloys. Crystals 2025, 15, 172. https://doi.org/10.3390/cryst15020172

AMA Style

Zhou S, Shu X, Hu L, Yuan X, Qiu P, Xu X. Effects of Y Additions on the Microstructure and Mechanical Properties of CoCr_1.7Ni Medium-Entropy Alloys. Crystals. 2025; 15(2):172. https://doi.org/10.3390/cryst15020172

Chicago/Turabian Style

Zhou, Shaoshuai, Xiaoyong Shu, Linli Hu, Xunyu Yuan, Panpan Qiu, and Xiwen Xu. 2025. "Effects of Y Additions on the Microstructure and Mechanical Properties of CoCr_1.7Ni Medium-Entropy Alloys" Crystals 15, no. 2: 172. https://doi.org/10.3390/cryst15020172

APA Style

Zhou, S., Shu, X., Hu, L., Yuan, X., Qiu, P., & Xu, X. (2025). Effects of Y Additions on the Microstructure and Mechanical Properties of CoCr_1.7Ni Medium-Entropy Alloys. Crystals, 15(2), 172. https://doi.org/10.3390/cryst15020172

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Effects of Y Additions on the Microstructure and Mechanical Properties of CoCr_1.7Ni Medium-Entropy Alloys

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