Effect of melt temperature on primary crystallization and thermal stability of Al86Ni6Y4.5Co2La1.5 metallic glass

In this paper, the correlations between the melt temperature of Al86Ni6Y4.5Co2La1.5 alloy and its crystallization behavior were studied. The results of differential scanning calorimetry (DSC) showed that the primary crystallization of Al86Ni6Y4.5Co2La1.5 alloy was greatly affected by the melt temperature: compared with the amorphous ribbons prepared at 1373 K and 1673K, the primary crystallization of the ribbons prepared at 1523 K was significantly advanced; The calculation of the activation energy indicated that the amorphous ribbon prepared at 1523 K has a lower energy barrier to be overcome during the first crystallization stage, which means that its thermal stability is worse, and fcc-Al is more likely to be precipitated; Abnormal melt structural changes were observed by electrical resistivity(ER), and liquid-liquid structure transition(LLST) occurred after 1402 K, which can be proved by the results of x-ray diffraction (XRD); Compared with the amorphous ribbons prepared at 1523 K and 1673K, the one prepared at 1373 K were more likely to precipitate intermetallic compounds during crystallization, which may be related to the disappearance of some atomic clusters caused by the increase of melt temperature.