Xu Yang, Dezhi Chen, Li Feng, Gang Qin, Shiping Wu, and Ruirun Chen, Enhancing the mechanical properties of casting eutectic high entropy alloys via W addition, Int. J. Miner. Metall. Mater.,(2024). https://doi.org/10.1007/s12613-024-2892-x
Cite this article as:
Xu Yang, Dezhi Chen, Li Feng, Gang Qin, Shiping Wu, and Ruirun Chen, Enhancing the mechanical properties of casting eutectic high entropy alloys via W addition, Int. J. Miner. Metall. Mater.,(2024). https://doi.org/10.1007/s12613-024-2892-x
Research Article

Enhancing the mechanical properties of casting eutectic high entropy alloys via W addition

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  • Received: 20 December 2023Revised: 28 February 2024Accepted: 22 March 2024Available online: 23 March 2024
  • In order to explore the effect of W element on the microstructure evolution and mechanical properties of Al1.25CoCrFeNi3 eutectic high entropy alloy (EHEA), Al1.25CoCrFeNi3-xWx (x=0, 0.05, 0.1, 0.3, 0.5) high entropy alloys (HEAs) were designed and prepared. Results show that Al1.25CoCrFeNi3Wx HEAs are composed of FCC phase and BCC phase. With the increase of W element, the microstructure changes from eutectic to dendrite. The addition of W lowers the nucleation barrier of BCC phase, decreases the valence electron concentration (VEC) of HEAs, and replaces Al in BCC phase, thus facilitating the nucleation of BCC phase. Tensile results show that the addition of W significantly improves the mechanical properties. Solid solution strengthening, heterogeneous interface strengthening and second phase strengthening are the main strengthening mechanisms. Yield strength, tensile strength and elongation of W0.05 HEA are 601.44 MPa, 1132.26 MPa and 15.94%, respectively, realizing a balance of strength and plasticity. Fracture mode of Al1.25CoCrFeNi3-xWx HEAs is ductile-brittle mixed fracture, and the crack propagates and initiates in BCC phase. The eutectic lamellar structure slows down the crack propagation rate and maintains the plasticity.

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