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Microstructure and Mechanical Properties of Nanostructured CoCrFeMoTi High-Entropy Alloy Fabricated by Mechanical Alloying and Spark Plasma Sintering

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Abstract

CoCrFeMoTi high-entropy alloy (HEA) was synthesized using mechanical alloying and spark plasma sintering. The corresponding microstructural features and phase composition were compared with those of CoCrFeNi, CoCrFeNiTix (x = 0, 0.3 and 0.5) and CoCrFeNiMox (x = 0, 0.3, 0.5 and 0.85) HEAs. Co, Cr, Fe, Mo and Ti elemental powders were mixed in equiatomic ratio and mechanically alloyed in a planetary ball mill at 300 rpm for up to 80 h. The influence of the milling duration on the evolution of microstructure, constituent phases and morphology was studied. After 40 h of ball milling, two supersaturated BCC solid solution phases were obtained. Milling time increasing resulted in grain refinement and higher solid solution homogenization characterized by a high internal strain. A partial phase transformation from BCC to intermetallic phases when the temperature exceeds 660 °C was revealed. After SPS consolidation, the Vickers hardness was 778 ± 10 HV, in combination with an ultimate shear stress of 216 ± 20 MPa and a yield shear stress of 81 ± 15 MPa for the material sintered at 950 °C and 65 MPa. Further increasing in the sintering temperature resulted in enhanced hardness value of 1600 ± 5 but reduced yield shear stress. The failure analysis revealed a brittle fracture of the synthesized materials.

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Authors and Affiliations

  1. Department of Materials Engineering, Isfahan University of Technology, Isfahan, 84156-83111, Iran

    Atia Torabizadeh, Mohammad Reza Toroghinejad, Fathallah Karimzadeh & Hamed Ravash

  2. Department of Materials Engineering, KU Leuven, 3001, Heverlee, Belgium

    Jef Vleugels

  3. Department of Innovation Engineering, University of Salento, Via per Arnesano, 73100, Lecce, Italy

    Pasquale Cavaliere

Authors
  1. Atia Torabizadeh
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  2. Mohammad Reza Toroghinejad
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  3. Fathallah Karimzadeh
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  4. Jef Vleugels
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  6. Pasquale Cavaliere
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Correspondence to Pasquale Cavaliere.

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Torabizadeh, A., Toroghinejad, M.R., Karimzadeh, F. et al. Microstructure and Mechanical Properties of Nanostructured CoCrFeMoTi High-Entropy Alloy Fabricated by Mechanical Alloying and Spark Plasma Sintering. J. of Materi Eng and Perform 28, 7710–7725 (2019). https://doi.org/10.1007/s11665-019-04501-5

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