The most principal obstacle to the development of intermetallic compounds Fe<sub>3</sub>Al and FeAl as constructional materials is always the room temeprature （RT） embrittleo-ment. The early studies indi...The most principal obstacle to the development of intermetallic compounds Fe<sub>3</sub>Al and FeAl as constructional materials is always the room temeprature （RT） embrittleo-ment. The early studies indicated that the poor RT ductility of polycrystalline Fe<sub>3</sub>Al with DO<sub>3</sub> structure was due to the weakness of grain boundaries, which results in the easy intergranular fracture. It was found from the experiments in recent展开更多
Ⅰ. THE CALCULATION MODEL OF GIBBS FREE ENERGY From Ref. [1], the expression of Gibbs free energy for disorder phase is: G^r=sum (X_iG_i^r)+ΔH^r-TΔS^r, (1) where for the physical meaningsof the quantities see Ref. [...Ⅰ. THE CALCULATION MODEL OF GIBBS FREE ENERGY From Ref. [1], the expression of Gibbs free energy for disorder phase is: G^r=sum (X_iG_i^r)+ΔH^r-TΔS^r, (1) where for the physical meaningsof the quantities see Ref. [1], the superscript 'r' represents disorder phase.展开更多
文摘The most principal obstacle to the development of intermetallic compounds Fe<sub>3</sub>Al and FeAl as constructional materials is always the room temeprature （RT） embrittleo-ment. The early studies indicated that the poor RT ductility of polycrystalline Fe<sub>3</sub>Al with DO<sub>3</sub> structure was due to the weakness of grain boundaries, which results in the easy intergranular fracture. It was found from the experiments in recent
文摘Ⅰ. THE CALCULATION MODEL OF GIBBS FREE ENERGY From Ref. [1], the expression of Gibbs free energy for disorder phase is: G^r=sum (X_iG_i^r)+ΔH^r-TΔS^r, (1) where for the physical meaningsof the quantities see Ref. [1], the superscript 'r' represents disorder phase.
