It is well known that amorphous metals prepared by rapid cooling from liquid statehave many excellent macroscopic properties, and this is mainly determined by their specialmicrostructures. Accordingly, to understand t...It is well known that amorphous metals prepared by rapid cooling from liquid statehave many excellent macroscopic properties, and this is mainly determined by their specialmicrostructures. Accordingly, to understand the relationship between the structures andproperties, it will have important theoretical and practical significance to find out the tran-sition feature of the microstructural configurations by tracking the forming process展开更多
A new microstructure model is developed for amorphous alloys,so called Cluster medel, in which the amorphous phase is thought of composing of randomly distributed ordered clusters of different sizes.Thermodynamic calc...A new microstructure model is developed for amorphous alloys,so called Cluster medel, in which the amorphous phase is thought of composing of randomly distributed ordered clusters of different sizes.Thermodynamic calculation on this model deduces a parameter describing the glass forming ability of metallic alloys:α_c=(1-2.08/Φ_m)T_g/T_m,where T_g is gass transition temperature,T_m is the melting temperature,and Φ_m is entralpy change of melting.It is believed that easy glass forming alloy systems have larger values of a_c.This new criterion of GFA not only provides the theoretical background for several GFA criteria in the literature cited,but also can predict the GFA of many alloy systems more reasonably and accurately.展开更多
基金Project supported by the National Natural Science Foundation of China.
文摘It is well known that amorphous metals prepared by rapid cooling from liquid statehave many excellent macroscopic properties, and this is mainly determined by their specialmicrostructures. Accordingly, to understand the relationship between the structures andproperties, it will have important theoretical and practical significance to find out the tran-sition feature of the microstructural configurations by tracking the forming process
文摘A new microstructure model is developed for amorphous alloys,so called Cluster medel, in which the amorphous phase is thought of composing of randomly distributed ordered clusters of different sizes.Thermodynamic calculation on this model deduces a parameter describing the glass forming ability of metallic alloys:α_c=(1-2.08/Φ_m)T_g/T_m,where T_g is gass transition temperature,T_m is the melting temperature,and Φ_m is entralpy change of melting.It is believed that easy glass forming alloy systems have larger values of a_c.This new criterion of GFA not only provides the theoretical background for several GFA criteria in the literature cited,but also can predict the GFA of many alloy systems more reasonably and accurately.
