Fe[sub 16]Al[sub 14]B[sub 2] phase in Fe-Al alloys.

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. [ABSTRACT FROM AUTHOR]