Effects of Al on Structure Evolution and Mechanical Performance of AlxCrFeNi (x > 1) Eutectic High-Entropy Alloys

作者：Wang, Mingze; Lu, Guangyao; Li, Jianhua; Wen, Zhiqin^*; Wei, Gaoxiang; Zhao, Yuhong

来源：TRANSACTIONS OF THE INDIAN INSTITUTE OF METALS, 2023, 76(4): 1045-1051.

DOI：10.1007/s12666-022-02765-5

• Eutectic high-entropy alloys
• Ultra-high Al content
• Labyrinthine structure
• Double-phase strengthening

AlxCrFeNi (x = 1.25, 1.5, 1.75, 2.0) EHEAs were introduced by different coupling structures. Grain refinement triggered the continuous improvement of ductility with the increase of Al content. Double strengthening phases and grain refinement effect could be evolution of different coupling structures in strain-hardening-rate response of AlxCrFeNi. Specifically, alloy's structure evolved from the coupling of mesh structure and labyrinth structure to completely labyrinth eutectic structure with the increase of Al content from 1.25 to 1.75, and the compressive mechanical properties appeared acute increased. Meanwhile, the ductility, yield strength and ultimate strength of Al1.75 reached 11.7%, 1325.4 MPa and 1621.0 MPa, respectively, which was significantly excellent compared to Al1.25 and Al1.5. It ascribed to the more stable combination of the two-phase cross labyrinth structure and stronger resistance to external impact.

• 单位
  桂林理工大学