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Phase transformation in Co-, Mn-, and Al-doped iron disilicide alloys

The dynamic behaviour of phase transformation in β-FeSi 2 based thermoelectric materials Fe 1-x M x Si 2+y (M = Mn or Co) has been studied by using differential scanning calometry (DSC) and in situ high-temperature and high-pressure X-ray powder diffraction measurements (EDXRD) using synchrotron radiation. The investigated materials were powders prepared by rapid solidification (melt spinning). It’s found by DSC and EDXRD that the α+e eutectic structures in the rapidly solidified alloys transform to β phase (α-Fe 2 Si 5 + e-FeSi → β-FeSi 2 ) in a lower temperature range below 700˚C. The formed β phase decomposes reversely to α and e phase in a higher temperature range above 950˚C. The observed β formation temperature T 1 is greatly influenced by the heating rate. By EDXRD measurements, it is found that high pressures have a great influence on the phase transformation temperatures T 1 and T 2 (decomposition of β phase). Different doping elements (Mn, Co, or Al) have also great influence on the phase transformation temperature. EDXRD has simulated the process of hot uniaxial pressing.