Structural evolution of Fe33Zr67 and Fe90Zr10 metallic glasses

Abstract We report on the structural evolution of melt-spun Fe 33 Zr 67 and Fe 90 Zr 10 glasses. These glasses are subjected to isothermal annealing over a wide temperature range, varying from the onset of crystallization up to near the melting point, for 20–300 min. Over 733–1223 K, the phase evolution sequence of the Fe 33 Zr 67 glass follows: fcc FeZr 2 → fcc FeZr 2 + bct FeZr 2 → bct FeZr 2 . In contrast, annealing of the Fe 90 Zr 10 glass over 903–1173 K leads to a mixture of α-Fe, Fe 3 Zr and Fe 2 Zr phases. Some Fe 2 Zr crystals are not developed perfectly, showing a special twin lamellar structure. The annealing temperature and alloy composition dependence of grain size in the present Fe–Zr system is discussed.