Atom probe tomography study of Fe-Ni-Al-Cr-Ti ferritic steels with hierarchically-structured precipitates

APT 3-D reconstruction of hierarchical structure of the precipitates, B2/L21 precipitates in FBB8-2Ti and L21/bcc sub-precipitates in FBB8-4Ti. The hierarchical structures are studied is discussed in the light of Ti ordering and phase separation using a pseudo-binary phase-diagram between (Ni,Fe)Al and (Ni,Fe)Ti.228