Fe-22.2 at%Ga合金におけるDO3相の規則化および不規則化の過程
1985 年 49 巻 5 号 p. 337-343
詳細
1985 年 49 巻 5 号 p. 337-343
The process of atomic ordering and disordering of an Fe-22.2 at%Ga alloy during the isothermal annealing was investigated by means of X-ray diffraction and electron microscopy. The DO3 type ordering was so rapid in this system that the alloy solution treated at 1023 K and then quenched consisted of fine DO3 domains formed during the quenching. At 873 and 773 K, the DO3 phase was in the metastable state, though the equilibrium state of the alloy was in the mixture of two phases, disordered A2 and ordered L12. During the annealing of quenched alloy at 873 K, the disordering of metastable DO3 phase took place by the decomposition. The DO3 phase was disordered homogeneously at 773 K, because Ga content in the DO3 phase lowered owing to the precipitation of highly ordered stable L12 phase.
