Analysis on phase nucleation in Sn-Ni peritectic alloy combining confocal laser scanning in-situ observation and differential scanning calorimetry

•Nucleation by these methods firstly in peritectic alloys containing IMCs.•The results by both the HT-CLSM and DSC show their consistence.•Dependence of ∆T on cooling rate is caused by concentration gradient.•Wetting angle for the heterogeneous nucleation are determined firstly.