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<p>As one of the candidate structural materials for the fourth generation reactors, CoCrFeNiMn exhibits superior irradiation resistance compared to nickel-based alloys and austenitic stainless steels. However, its relatively low strength at room temperature and high temperatures is one of the key factors limiting its application. To enhance the mechanical properties of CoCrFeNiMn HEAs, we prepared and studied Y<sub>2</sub>O<sub>3</sub> reinforced CoCrFeNiMn HEAs using powder plasma arc additive manufacturing (PPA-AM) and laser metal deposition (LMD). The effects of these two processes on the microstructure and mechanical properties were investigated. Results show that both samples exhibit a face-centered cubic (FCC) structure. Compared to PPA-AMed samples, LMDed samples exhibit smaller grain sizes, lower Schmid factors, and higher dislocation densities. Mechanical property tests reveal that the LMDed samples have significantly higher microhardness, yield strength, and ultimate tensile strength than the PPA-AMed samples, achieving values of 189.9 HV, 410.0&#xa0;MPa, and 566.0&#xa0;MPa. The elongation is reasonably reduced to 17.0%. Notably, this study is the first to identify amorphous YMn<sub>x</sub>O<sub>y</sub> particles and spinel MnCr<sub>2</sub>O<sub>4</sub> particles in Y<sub>2</sub>O<sub>3</sub> reinforced CoCrFeNiMn HEAs prepared by LMD. Furthermore, the formation mechanisms of these particles are elaborated in detail. These findings provide an important theoretical foundation and experimental evidence for the optimization of microstructure and properties of oxide-reinforced HEAs in additive manufacturing.</p>

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Microstructure and Properties of Y2O3 Reinforced CoCrFeNiMn High-Entropy Alloy Fabricated by Powder Plasma Arc and Laser Metal Deposition Additive Manufacturing

  • 期刊论文

  • 发表日期：

    2025年9月23日

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  • Junjie Tan,
  • Kang Peng,
  • Xizhang Chen,
  • Min Chen,
  • Zhijun Tong,
  • Xinwei Mao

摘要

As one of the candidate structural materials for the fourth generation reactors, CoCrFeNiMn exhibits superior irradiation resistance compared to nickel-based alloys and austenitic stainless steels. However, its relatively low strength at room temperature and high temperatures is one of the key factors limiting its application. To enhance the mechanical properties of CoCrFeNiMn HEAs, we prepared and studied Y2O3 reinforced CoCrFeNiMn HEAs using powder plasma arc additive manufacturing (PPA-AM) and laser metal deposition (LMD). The effects of these two processes on the microstructure and mechanical properties were investigated. Results show that both samples exhibit a face-centered cubic (FCC) structure. Compared to PPA-AMed samples, LMDed samples exhibit smaller grain sizes, lower Schmid factors, and higher dislocation densities. Mechanical property tests reveal that the LMDed samples have significantly higher microhardness, yield strength, and ultimate tensile strength than the PPA-AMed samples, achieving values of 189.9 HV, 410.0 MPa, and 566.0 MPa. The elongation is reasonably reduced to 17.0%. Notably, this study is the first to identify amorphous YMnxOy particles and spinel MnCr2O4 particles in Y2O3 reinforced CoCrFeNiMn HEAs prepared by LMD. Furthermore, the formation mechanisms of these particles are elaborated in detail. These findings provide an important theoretical foundation and experimental evidence for the optimization of microstructure and properties of oxide-reinforced HEAs in additive manufacturing.