• Dankházi, Zoltán
• Varga, Lajos K.
• Kalácska, Szilvia
• Molnár, Dávid Sándor
• Windisch, Márk
• Maksa, Zsolt
• Vida, Ádám
• Nguyen, Quang Chinh
• Huhn, Gabriella

Abstract

<jats:p>The present investigation is directed to phase transitions in the equimolar NiCoFeCrGa high entropy alloy, which is a mixture of face-centered cubic (FCC) and body-centered cubic (BCC) crystalline phases. The microstructure of the samples was investigated by using scanning electron microscopy (SEM), time-of-flight secondary ion mass spectroscopy (TOF-SIMS), transmission electron microscopy-based energy-dispersive spectroscopy (EDS) and electron energy loss spectroscopy (EELS), as well as X-ray diffraction (XRD) measurements. Based on the phases observed in different temperature ranges, a sequence of the phase transitions can be established, showing that in a realistic process, when freely cooling the sample with the furnace from high to room temperature, a microstructure having spinodal-like decomposition can also be expected. The elemental mapping and magnetic behaviors of this decomposed structure are also studied.</jats:p>

Topics

• impedance spectroscopy
• microstructure
• scanning electron microscopy
• x-ray diffraction
• crystalline phase
• phase transition
• transmission electron microscopy
• Energy-dispersive X-ray spectroscopy
• decomposition
• electron energy loss spectroscopy
• selective ion monitoring