Effect of Al and AlP on the microstructure of Mn–30 wt.%Si alloy

Effect of Al and AlP particles on the microstructure of near eutectic Mn–Si alloy (Mn–30 wt.%Si) was studied by Electron Probe Micro-analyzer (EPMA) and Differential Scanning Calorimeter (DSC). Crystal lattice correspondence analyses show that both Al and AlP have good lattice matching coherence relationships with MnSi phase, and the addition of Al and AlP particles results in an abnormal eutectic structure, i.e. the eutectic constitution MnSi and Mn5Si3 precipitate separately: MnSi precipitates firstly, and then the Mn5Si3 phase.