Abstract: Recrystallization of irradiationinduced amorphous TiNiCu alloys has been investigated by means of the in situ transmission electron microscopy (TEM). TiNiCu shape memory alloy samples were amorphized by 400keV Xe+ ions at room temperature using IVEMTandem Facility at Argonne National Laboratory. The recovery process of amorphization was observed upon annealing from room temperature to 750℃ at a rate of 10℃ /min by in situ TEM. The recrystallization started when annealing at 280℃ for 10 min and the diffraction spots appeared around the amorphous rings. The polycrystalline rings started to form at 550℃ and the recrystallization basically finished at 750℃. The polycrystalline rings are indexed to TiNiCu SMAs. The microstructure after the recrystallization is different from that of th