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  Manzoni, A. M.; Dubois, F.; Mousa, M.S.; von Schlippenbach, C.; Többens, D.M.; Yesilcicek, Y.; Zaiser, E.; Hesse, R.; Haas, S.; Glatzel, U.: On the Formation of Eutectics in Variations of the Al₁₀Co₂₅Cr₈Fe₁₅Ni₃₆Ti₆ Compositionally Complex Alloy. Metallurgical and Materials Transactions A 52 (2021), p. 143–150

10.1007/s11661-020-06091-7
Open Accesn Version

Abstract:
Superalloy inspired Al10Co25Cr8Fe15Ni36Ti6 compositionally complex alloy is known for its c-c¢ microstructure and the third Heusler phase. Variations of this alloy, gained by replacing 0.5 or 1 at. pct Al by the equivalent amount of Mo, W, Zr, Hf or B, can show more phases in addition to this three-phase morphology. When the homogenization temperature is chosen too high, a eutectic phase formation can take place at the grain boundaries, depending on the trace elements: Mo and W do not form eutectics while Hf, Zr and B do. In order to avoid the eutectic formation and the potential implied grain boundary weakening, the homogenization temperature must be chosen carefully by differential scanning calorimetry measurements. A too low homogenization temperature, however, could impede the misorientation alignment of the dendrites in the grain. The influence of grain boundary phases and incomplete dendrite re-orientation are compared and discussed.