Systematic study of mechanical deformation on Fe3AlxSi1-x powders by Moessbauer spectroscopy

The Moessbauer technique has been used to measure hyperfine magnetic fields, isomer shifts and relative areas of 57Fe atoms located at various sites in Fe3AlxSi1-x series with x = 0, 0.3, 0.5, 0.7. Four samples were crushed; then they were annealed for 10 h at 1,023 K and cooled down at 3o/min in order to recover the DO3 stable phase. Moessbauer studies revealed that annealed samples have a DO3 structure, whereas deformed samples are partially disordered, with both ordered DO3 and disordered A2 structures, even though X-rays measurements do not show superstructure peaks. The amount of disordered structure decreases with Si content.