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

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. (C) 2019 Elsevier B.V. All rights reserved.