Mechanical spectroscopy as an in situ tool to study first and second order transitions in metastable Fe-Ga alloys

Abstract Phase transitions and related anelastic effects are examined in Fe-xGa alloys (x = 19 and 27 at.%) by means of in-situ neutron diffraction, vibrating sample magnetometry, dilatometry, and three different mechanical spectroscopy techniques: torsion forced pendulum, vibrating reed, and commercial DMA Q800. Anelastic transient effects due to ordering-disordering (D0 3 ↔ A 2 ) in Fe-19Ga, and first order phase transitions (D0 3 → L1 2 → D0 19 → B2) in Fe-27Ga compositions, are discussed with respect to phase and magnetic transitions.