Magnetic and calorimetric study of point defects in FeAl intermetallic compound

High temperature strengthening of the FeAl intermetallic phase-based alloy

“…The faster decrease of the magnetic susceptibility indicates that in the temperature range from about 723 to 823 K the antisite iron atoms return to their original sublattice. This is in agreement with the works [28,29] that deal with two-component FeAl alloys.…”

Differential scanning calorimetry study on annihilation behavior of supersaturated thermal vacancies in B2-type FeAl

“…As already having reported so far, two exothermic peaks are observed for rapidly solidified or quenched FeAl in DSC [17e19, 22,29,30]. Fig.…”

“…Zaroual et al [29] observed two distinct exothermic peaks in their DSC profiles in quenched Fe-50 at.% Al bulks. They suggested that the small peak appearing at lower temperatures may be attributed to the reorientation of the pairs of anti-site iron atoms on the aluminum sublattice and the vacancies on the iron sublattice, and, considering their magnetic susceptibility measurements, they concluded that the principal peak appearing at higher temperature is attributed to the migration and relaxation of supersaturated vacancies.…”

Nanoporous Surfaces of FeAl Formed by Vacancy Clustering

“…In addition, no peak is detectable during cooling process, so that these peaks are irreversible. Zaroual et al 21) also observed an exothermic peak in the similar temperature range in quenched-in FeAl bulks, and concluded with the results of magnetic susceptibility measurements that the peak is attributed to migration and clustering of supersaturated vacancies. The activation energy of the relaxation process estimated by the Kissinger 22) plot is approximately 1.17 eV (Fig.…”

“…Since the vacancy concentration of Fe-45 mol%Al water-quenched from 1273 K 16) is comparaal. 21) Thus, we are convinced that the exothermic relaxation peaks are related to the absorption process of supersaturated vacancies accompanied with migration and clustering.…”