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<p>The strength--ductility synergy in the (Fe35Ni35Cr20Mn10)<sub>95.3</sub>Ti<sub>4.7</sub> high-entropy alloy (HEA) was significantly improved through thermomechanical treatment, which optimized the distribution and morphology of the η-Ni<sub>3</sub>Ti phase. A thorough examination, including observation, testing, and analysis, was conducted on the microstructure and mechanical properties of this HEA. The microstructure of the (Fe35Ni35Cr20Mn10)<sub>95.3</sub>Ti<sub>4.7</sub> HEA comprises a face-centered cubic (FCC) matrix phase and a hexagonal η-Ni<sub>3</sub>Ti phase. The η-Ni<sub>3</sub>Ti phase appears in two distinct forms: strip-like and spheroidized. The (Fe35Ni35Cr20Mn10)<sub>95.3</sub>Ti<sub>4.7</sub> HEA subjected to thermomechanical treatment exhibits outstanding overall mechanical performance, achieving a harmonious blend of high yield strength (1046&#xa0;MPa) and substantial uniform elongation (12.5%). The alloy's high strength primarily stems from the effects of dislocation proliferation and second-phase strengthening. Additionally, the formation of dislocation cells and microbands, along with the coordinated deformation between the two-phase structures, is identified as the primary factors contributing to its exceptional ductility.</p>

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Enhancing Strength--Ductility Synergy of (Fe35Ni35Cr20Mn10)95.3Ti4.7 High-Entropy Alloy Via Thermomechanical Treatment

  • 期刊论文

  • 发表日期：

    2025年12月29日

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  • Jialin Qin,
  • Jun Zhou,
  • Hengcheng Liao,
  • Hongmei Chen,
  • Di Feng

摘要

The strength--ductility synergy in the (Fe35Ni35Cr20Mn10)95.3Ti4.7 high-entropy alloy (HEA) was significantly improved through thermomechanical treatment, which optimized the distribution and morphology of the η-Ni3Ti phase. A thorough examination, including observation, testing, and analysis, was conducted on the microstructure and mechanical properties of this HEA. The microstructure of the (Fe35Ni35Cr20Mn10)95.3Ti4.7 HEA comprises a face-centered cubic (FCC) matrix phase and a hexagonal η-Ni3Ti phase. The η-Ni3Ti phase appears in two distinct forms: strip-like and spheroidized. The (Fe35Ni35Cr20Mn10)95.3Ti4.7 HEA subjected to thermomechanical treatment exhibits outstanding overall mechanical performance, achieving a harmonious blend of high yield strength (1046 MPa) and substantial uniform elongation (12.5%). The alloy's high strength primarily stems from the effects of dislocation proliferation and second-phase strengthening. Additionally, the formation of dislocation cells and microbands, along with the coordinated deformation between the two-phase structures, is identified as the primary factors contributing to its exceptional ductility.