☆ 4.6 Article

Microstructures and properties of CrxFeNi(3-x)Al high-entropy alloys

APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING (2022)

期刊

APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING

卷 128, 期 1, 页码 -

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SPRINGER HEIDELBERG

DOI: 10.1007/s00339-021-05118-z

关键词

High-entropy alloy; Solidification microstructures; Compressive properties; Co-free

类别

Materials Science, Multidisciplinary Physics, Applied

资金

National Natural Science Foundation of China [51604161]
Yichang Key Laboratory of Graphite Additive Manufacturing Program [YKLGAM202001]

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摘要

A set of Co-free high-entropy alloys with different compositions were fabricated and their solidification microstructures and compression properties were investigated. Different solidification microstructures were observed for different compositions, and the distribution of different phases in the alloys was studied. The strength of the alloys initially decreased and then increased with increasing Cr content, and the rise in strength was mainly attributed to solid solution strengthening, fine crystal strengthening, and precipitation of a certain phase.

A set of novel Co-free high-entropy alloys CrxFeNi(3-x)Al (x = 0.25, 0.5, 0.75, 1, 1.25, 1.5) were fabricated by non-self-consumable vacuum melting method, and their solidification microstructures as well as compression properties were investigated. The research results firstly demonstrate that the solidification microstructures of Cr-0.25, Cr-0.5 and Cr-0.75 are composed of primary B2 phase and (FCC + B2) eutectic structure; Secondly, there are primary B2 phase and (FCC + B2) eutectic structure in the solidification microstructure of Cr-1, with a tiny amount of BCC phase distributing on the matrix of primary phase B2; In addition, as a sunflower-like structure of BCC phase and B2 phase, the solidification microstructure of Cr-1.25 is identified. Also, the core of the sunflower is B2 phase, and the petals are alternately arranged by BCC phase and B2 phase; Last but not least, it is a fine BCC phase and B2 dual-phase structure that form the solidification microstructure of Cr-1.5. Among the phases mentioned above, the FCC phase is abundant in Ni and Fe elements, the B2 phase is abundant in Ni and Al elements, and the BCC phase is abundant in Cr element. With the ascending trend of Cr content, the strength of CrxFeNi(3-x)Al high-entropy alloy descends initially and then climbs, during which the primary reasons for the rise of strength are solid solution strengthening, fine crystal strengthening and precipitation of BCC phase. The compressive strengths of Cr-1.25 and Cr-1.5 alloys are 2111.5 and 1985.3 MPa, respectively, and the compressibility can attain to 41.36 and 49.87%, respectively, manifesting comprehensive mechanical properties.

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A novel Co-free Al0.75CrFeNi eutectic high entropy alloy with superior mechanical properties

Wenna Jiao, Tianxin Li, Xiaoxue Chang, Yiping Lu, Guomao Yin, Zhiqiang Cao, Tingju Li

Summary: Eutectic high entropy alloys (EHEAs) are a promising option for engineering applications due to their superior mechanical properties and good castability. In this study, a new Co-free Al0.75CrFeNi EHEA was designed and prepared, exhibiting excellent mechanical properties with a high yield strength, fracture strength, and elongation to fracture. The alloy's deformation behavior was dominated by dislocation gliding in the BCC phase, and dislocation activation in the B2 phase contributed to further strain increase. The alloy achieved a good balance between strength and ductility through dislocation interactions and microstructural features.

JOURNAL OF ALLOYS AND COMPOUNDS (2022)