Mechanical spectroscopy of ordered ferromagnetic Fe3Al intermetallic compounds

By means of the vibrating-reed technique the temperature and magnetic field dependencies of internal friction and elastic modulus have been measured for ferromagnetic single and polycrystals of D03 ordered Fe3Al. Specimens with different content of carbon showed the expected variation of the Snoek peak (at around 500 K) which changed its height drastically from the heating to the cooling run, and could be reproduced in its original height by a quenching treatment. This indicates some immobilization and remobilization of carbon probably in carbide precipitates. Quenching and subsequent annealing also causes a slight shift of the position of the Snoek peak while the Zener peak (at about 900 K) remains unchanged. The elastic modulus shows a pronounced ΔE-effect changing with thermal treatments.