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<p>This study investigates the effects of heat treatment on the microstructure and properties of FeCoCrNi high-entropy alloy (HEA) fabricated by laser additive manufacturing and cold rolling. The alloy underwent heat treatments at various temperatures (500 to 1300&#xa0;°C), and its microstructural evolution and mechanical properties were analyzed. Cold rolling introduces high dislocation density and refines the grain structure, which facilitates subsequent recovery and recrystallization during heat treatment. The low-temperature heat treatment (500&#xa0;°C) results in high tensile strength (1114.1&#xa0;MPa) and microhardness (461.6 HV<sub>0.3</sub>), but low elongation (4.5%). As the heat treatment temperature increases, dislocation density decreases, grain growth occurs, leading to reduced strength and microhardness but improved ductility. The optimized heat treatment at 500&#xa0;°C enhances the strength–ductility balance, which can support the use of FeCoCrNi HEA in high-performance applications.</p>

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The Mechanism of Heat Treatment Effects on the Microstructure and Properties of Additively Manufactured Cold-Rolled FeCoCrNi High-Entropy Alloys

  • 期刊论文

  • 发表日期：

    2025年9月30日

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  • Yan Cui,
  • Yangchuan Cai,
  • Weihong Li,
  • Yan Zhao,
  • Xiaohua Wang,
  • Jinyao Mu

摘要

This study investigates the effects of heat treatment on the microstructure and properties of FeCoCrNi high-entropy alloy (HEA) fabricated by laser additive manufacturing and cold rolling. The alloy underwent heat treatments at various temperatures (500 to 1300 °C), and its microstructural evolution and mechanical properties were analyzed. Cold rolling introduces high dislocation density and refines the grain structure, which facilitates subsequent recovery and recrystallization during heat treatment. The low-temperature heat treatment (500 °C) results in high tensile strength (1114.1 MPa) and microhardness (461.6 HV0.3), but low elongation (4.5%). As the heat treatment temperature increases, dislocation density decreases, grain growth occurs, leading to reduced strength and microhardness but improved ductility. The optimized heat treatment at 500 °C enhances the strength–ductility balance, which can support the use of FeCoCrNi HEA in high-performance applications.