Microstructure and mechanical properties of FexCoCrNiMn high-entropy alloys

doi:10.1016/j.jmst.2019.05.050

Abstract

Abstract:

The microstructure and tensile properties of Fe_xCoCrNiMn high-entropy alloys (HEAs) were investigated. It was found that the Fe_xCoCrNiMn HEA has a single face-centered cubic (fcc) structure in a wide range of Fe content. Further increasing the Fe content endowed the Fe_xCoCrNiMn alloys with an fcc/body-centered cubic (bcc) dual-phase structure. The yield strength of the Fe_xCoCrNiMn HEAs slightly decreased with the increase of Fe content. An excellent combination of strength and ductility was achieved in the Fe_xCoCrNiMn HEA with higher Fe content, which can be attributed to the outstanding deformation coordination capability of the fcc/bcc dual phase structure.

Key words: High-entropy alloys, Microstructure, Mechanical properties, Strength, Ductility

Tao Zhang, Lijun Xin, Fufa Wu, Rongda Zhao, Jun Xiang, Minghua Chen, Songshan Jiang, Yongjiang Huang, Shunhua Chen. Microstructure and mechanical properties of Fe_xCoCrNiMn high-entropy alloys[J]. J. Mater. Sci. Technol., 2019, 35(10): 2331-2335.

Figures/Tables 4

Fig. 1. EBSD images showing the microstructure of the FexCoCrNiMn alloys: (a) F20, (b) F40, and (c) F67, with insets showing the corresponding OM images, (d) EBSD image showing the phase composition of the F67 alloy, (e) SEM image of the F67 alloy showing the dendrite structure (Points A and B denote the dendrite and matrix, respectively) and (f) EDS results of the F67 alloy showing the chemical composition difference between the dendrite and the matrix along the dotted line in Fig. 1(e).

Fig. 2. XRD patterns of the FexCoCrNiMn alloys, with inset showing the main diffraction peaks of the fcc and bcc phases.

Fig. 3. Tensile properties of the FexCoCrNiMn alloys: (a) nominal tensile stress-strain curves; (b) statistics of the ultimate tensile strength and the ductility of the alloys with the Fe content; (c) true stress-strain curves; (d) strain-hardening rate with respect to the true strains.

Fig. 4. Strength-ductility relationship of some classes of metallic materials, including HEAs.

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