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<p>Effects of deformation and annealing on the microstructure and mechanical properties on the CoCrFe8NiMn (hereinafter to be referred as Fe8) medium-entropy alloy were systematically investigated. Two deformation-induced phase transformations (FCC-to-BCC and FCC-to-HCP) occur during the cold-rolling process, while the reverse phase transformations (BCC-to-FCC and HCP-to-FCC) take place undergoing the annealing treatment. A good combination of strength (995&#xa0;MPa) and plasticity (28.1%) for this alloy was obtained after rolling and annealing. Microstructural analysis confirms the FCC, HCP and BCC phases in this alloy obey specific orientation relationships. Electron backscatter diffraction results reveal that two strain-induced phase transformations (FCC-to-BCC and FCC-to-HCP) occur in the annealed Fe8 alloy sample during the tensile deformation, resulting in the transformation-induced plasticity (TRIP) effect. Thereby, the annealed Fe8 alloy achieves an optimal strength-plasticity balance and becomes a potential candidate used for engineering material.</p>

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Effects of deformation and annealing on microstructure and mechanical properties of CoCrFe8NiMn alloy

  • 期刊论文

  • 发表日期：

    2025年2月9日

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  • Menglu Jian,
  • Min Liu,
  • Qiannan Hu,
  • Fan Yang,
  • Zhanyong Wang,
  • Fangjie Li,
  • Han Hu,
  • Qin Shen

摘要

Effects of deformation and annealing on the microstructure and mechanical properties on the CoCrFe8NiMn (hereinafter to be referred as Fe8) medium-entropy alloy were systematically investigated. Two deformation-induced phase transformations (FCC-to-BCC and FCC-to-HCP) occur during the cold-rolling process, while the reverse phase transformations (BCC-to-FCC and HCP-to-FCC) take place undergoing the annealing treatment. A good combination of strength (995 MPa) and plasticity (28.1%) for this alloy was obtained after rolling and annealing. Microstructural analysis confirms the FCC, HCP and BCC phases in this alloy obey specific orientation relationships. Electron backscatter diffraction results reveal that two strain-induced phase transformations (FCC-to-BCC and FCC-to-HCP) occur in the annealed Fe8 alloy sample during the tensile deformation, resulting in the transformation-induced plasticity (TRIP) effect. Thereby, the annealed Fe8 alloy achieves an optimal strength-plasticity balance and becomes a potential candidate used for engineering material.