Mechanical spectroscopy in Fe–Al–Si alloys at elevated temperatures

The mechanical spectroscopy response in Fe-25 at.% (Al + Si) and Fe-15 at.% (Al + Si) has been studied in the temperature interval between 800 and 1200 K. The solute grain boundary relaxation of aluminium and silicon was strongly dependent of the degree of order in the sample. A decrease in the order degree allows the development of the solute peak at around 1000 K during the cooling from 1200 K. Nevertheless, if the order degree is not decreased, the grain boundaries remain locked and consequently the relaxation peak does not appear.