Microstructure and Properties of Ni<sub><i>x</i></sub>AlTiCrFeCoCu High Entropy Alloys

LI Anmin; HUANG Yuwei; CHEN Ruohuai; OUYANG Zhifeng; ZHENG Qifeng

doi:10.11973/jxgccl201705011

Materials and Mechanical Engineering > 2017 > 41(5): 53-58. > DOI: 10.11973/jxgccl201705011

LI Anmin, HUANG Yuwei, CHEN Ruohuai, OUYANG Zhifeng, ZHENG Qifeng. Microstructure and Properties of Ni_xAlTiCrFeCoCu High Entropy Alloys[J]. Materials and Mechanical Engineering, 2017, 41(5): 53-58. DOI: 10.11973/jxgccl201705011

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Microstructure and Properties of Ni_xAlTiCrFeCoCu High Entropy Alloys

1. School of Material Science and Engineering, Guangxi University, Nanning 530004, China;
2. Yuchai Group Co., Ltd., Yulin 537000, China

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Received Date: January 28, 2016
Revised Date: March 15, 2017

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Abstract

A series of Ni_xAlTiCrFeCoCu (x=0.5, 1.0, 1.5, 2.0, 2.5, 3.0) high entropy alloys were prepared by vacuum arc furnace. The microstructures,compressive property and corrosion resistance of as-cast high entropy alloys were analyzed. The results indicate that the phases of these alloys were mainly composed by solid solution of body-centered cubic structure and face-centered cubic structure. There were four typical cast structures including petal shaped organization(α-phase), chrysanthemum shaped eutectic structure, intergranular organization which is rich of copper and Ni-riched phase. With the increase of Ni content, petal shaped α-phase reduced and even disappeared when x was 2.0, then the Ni-riched phase appeared. The yield strengths of all other alloys were higher than 1.5 GPa and the compressive strengths were about 2 GPa except NiAlTiCrFeCoCu alloy, and the fractures of these high entropy alloys showed brittle fracture. High entropy alloy had the best performance of corrosion resistance in H₂SO₄ solution when x was 2.0, and the corrosion resistances of high entropy alloys were better than that of 304 stainless steel in NaCl solution when x were 1.5, 2.0 and 3.0.
- high entropy alloy,
- microstructure,
- compressive property,
- corrosion resistance

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Microstructure and Properties of Ni_xAlTiCrFeCoCu High Entropy Alloys