Experimental results that indicate an unusual state detected in the fcc structure of the metastable Fe23B6 phase upon compacting and additional annealing are presented. This state manifests itself macroscopically in the form of the processes of α-Fe dissolution and precipitation without changing the magnetic-transition temperature TC of the mechanically synthesized alloy. The Mossbauer data of the mechanically synthesized Fe23B6 alloy suggest that the nature of this phenomenon is determined by changes in the parameters of the local surrounding of iron atoms in crystallographic position Fe(4a) in the fcc unit cell.