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<p>This study investigated the solidification behavior and mechanical properties of a large-sized (CrCoNi)<sub>94</sub>Al<sub>3</sub>Ta<sub>3</sub> medium-entropy alloy (MEA) fabricated via induction skull melting (ISM). The as-solidified microstructure exhibited a typical dendritic morphology, sensitive to cooling rate. The alloy consisted of a γ-phase matrix (face-centered cubic structure), γ′ precipitates ((Ni, Co)<sub>3</sub>(Al, Ta) with L1<sub>2</sub> structure), and Laves phase particles (Co<sub>2</sub>Ta with hexagonal close-packed structure). Aluminum (Al) and tantalum (Ta) acted as positive segregation elements, enriching the interdendritic (ID) regions and influencing subsequent solidification and precipitation. Microhardness measurements revealed a significant difference between the dendrite region (DR) (208 HV) and the ID region (272 HV). The alloy demonstrated a compressive yield strength of 540&#xa0;MPa and exhibited over 70% plastic strain at room temperature. These excellent mechanical properties are attributed to solid solution strengthening, second-phase (γ′ and Laves) strengthening, and heterogeneous structure strengthening.</p>

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Solidification Behavior and Mechanical Properties of large-sized (CrCoNi)94Al3Ta3 Medium Entropy Alloy

  • 期刊论文

  • 发表日期：

    2025年11月22日

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  • Jiebo Lu,
  • Minxu Zhou,
  • Tengfei Ma,
  • Xiaohong Wang,
  • Ao Li,
  • Yunting Su

摘要

This study investigated the solidification behavior and mechanical properties of a large-sized (CrCoNi)94Al3Ta3 medium-entropy alloy (MEA) fabricated via induction skull melting (ISM). The as-solidified microstructure exhibited a typical dendritic morphology, sensitive to cooling rate. The alloy consisted of a γ-phase matrix (face-centered cubic structure), γ′ precipitates ((Ni, Co)3(Al, Ta) with L12 structure), and Laves phase particles (Co2Ta with hexagonal close-packed structure). Aluminum (Al) and tantalum (Ta) acted as positive segregation elements, enriching the interdendritic (ID) regions and influencing subsequent solidification and precipitation. Microhardness measurements revealed a significant difference between the dendrite region (DR) (208 HV) and the ID region (272 HV). The alloy demonstrated a compressive yield strength of 540 MPa and exhibited over 70% plastic strain at room temperature. These excellent mechanical properties are attributed to solid solution strengthening, second-phase (γ′ and Laves) strengthening, and heterogeneous structure strengthening.