TY - JOUR
T1 - Isochronal crystallization kinetics of Fe40Ni40B 20 amorphous alloy
AU - Ma, Yazhu
AU - Rheingans, Bastian
AU - Liu, Feng
AU - Mittemeijer, Eric J.
PY - 2013/8
Y1 - 2013/8
N2 - The kinetics of crystallization of amorphous Fe40Ni 40B20 alloy upon isochronal annealing was investigated applying power-compensating differential scanning calorimetry with heating rates of (5, 10, 20, 30, 40) K/min. The corresponding microstructural evolution was studied by means of X-ray diffraction, focused ion beam and scanning electron microscopy, and transmission electron microscopy. Crystallization of Fe 40Ni40B20 alloy upon isochronal annealing takes place by formation of nano-scaled grains consisting of a face-centered cubic solid solution phase (Fe,Ni) and an orthorhombic compound phase (Fe,Ni) 3B. Kinetic analysis was performed by application of a modular model of phase transformation kinetics, fitted to all experimental transformation-rate curves simultaneously. The crystallization reaction can be described by nucleation with a continuous nucleation rate incorporating a nucleation index a and by growth in three dimensions according to a linear growth law. The kinetics of transformation and the resulting microstructure observed upon isochronal annealing clearly differ from those upon isothermal annealing investigated in a previous study, reflecting different mechanisms operating upon isochronal and isothermal crystallization.
AB - The kinetics of crystallization of amorphous Fe40Ni 40B20 alloy upon isochronal annealing was investigated applying power-compensating differential scanning calorimetry with heating rates of (5, 10, 20, 30, 40) K/min. The corresponding microstructural evolution was studied by means of X-ray diffraction, focused ion beam and scanning electron microscopy, and transmission electron microscopy. Crystallization of Fe 40Ni40B20 alloy upon isochronal annealing takes place by formation of nano-scaled grains consisting of a face-centered cubic solid solution phase (Fe,Ni) and an orthorhombic compound phase (Fe,Ni) 3B. Kinetic analysis was performed by application of a modular model of phase transformation kinetics, fitted to all experimental transformation-rate curves simultaneously. The crystallization reaction can be described by nucleation with a continuous nucleation rate incorporating a nucleation index a and by growth in three dimensions according to a linear growth law. The kinetics of transformation and the resulting microstructure observed upon isochronal annealing clearly differ from those upon isothermal annealing investigated in a previous study, reflecting different mechanisms operating upon isochronal and isothermal crystallization.
UR - http://www.scopus.com/inward/record.url?scp=84878631436&partnerID=8YFLogxK
U2 - 10.1007/s10853-013-7354-1
DO - 10.1007/s10853-013-7354-1
M3 - 文章
AN - SCOPUS:84878631436
SN - 0022-2461
VL - 48
SP - 5596
EP - 5606
JO - Journal of Materials Science
JF - Journal of Materials Science
IS - 16
ER -