CALPHAD aided eutectic high-entropy alloy design

Abstract A CALPHAD aided eutectic high-entropy alloy (EHEA) design method was proposed, in which series of pseudo-binary diagrams based on the eutectic constituent phases were calculated, and a pseudo-ternary phase diagram was established to further guide the alloy design. Under the guidance of thermodynamic calculations, two FCC + B2 AlCoCrNi EHEAs were successfully prepared and the lamellar and rod mixed eutectic microstructures were confirmed via characterization. Despite of less accurate prediction of the eutectic composition, which may be ascribed to the imperfect database, this method provides important message for EHEA design and is expected to help explore more EHEA systems.

[1]  E. George,et al.  Achieving ultra-high strength and ductility in equiatomic CrCoNi with partially recrystallized microstructures , 2019, Acta Materialia.

[2]  Qiang Wang,et al.  Designing eutectic high entropy alloys of CoCrFeNiNbx , 2016 .

[3]  D. Miracle,et al.  A critical review of high entropy alloys and related concepts , 2016 .

[4]  Chuan Zhang,et al.  Computational Thermodynamics Aided High-Entropy Alloy Design , 2012, JOM.

[5]  Hui Jiang,et al.  A new strategy to design eutectic high-entropy alloys using mixing enthalpy , 2017 .

[6]  Lu Zhang,et al.  A new pseudo binary strategy to design eutectic high entropy alloys using mixing enthalpy and valence electron concentration , 2018 .

[7]  T. Shun,et al.  Nanostructured High‐Entropy Alloys with Multiple Principal Elements: Novel Alloy Design Concepts and Outcomes , 2004 .

[8]  A. Pilchak,et al.  CALPHAD-aided development of quaternary multi-principal element refractory alloys based on NbTiZr , 2019, Journal of Alloys and Compounds.

[9]  Huijun Kang,et al.  A Promising New Class of High-Temperature Alloys: Eutectic High-Entropy Alloys , 2014, Scientific Reports.

[10]  Hui Jiang,et al.  A new strategy to design eutectic high-entropy alloys using simple mixture method , 2018 .

[11]  C. Woodward,et al.  Accelerated exploration of multi-principal element alloys with solid solution phases , 2015, Nature Communications.

[12]  S. Gorsse,et al.  High temperature strength of refractory complex concentrated alloys , 2019, Acta Materialia.

[13]  B. Cantor,et al.  Microstructural development in equiatomic multicomponent alloys , 2004 .

[14]  Jonathan D. Miller,et al.  Accelerated exploration of multi-principal element alloys for structural applications , 2015 .