Fe₁₆Al₁₄B₂ phase in Fe–Al alloys

Abstract

The atomic structure and composition of a recently reported second phase found in Fe–Al alloys with small B and C additions have been determined using a combination of Z-contrast imaging and electron-energy-loss spectroscopy. The structure of this ordered tetragonal precipitate is found to be closely related to the B2 structure of the matrix. The derived structure and electron-energy-loss spectroscopy indicate that the phase is a new low-metalloid-content boride with B occupying specific interstitial sites.