Microstructure of phosphorus ion-implanted TiNi alloy

The microstructures of phosphorus ion-implanted TiNi alloys were investigated. Specimens were cut from cold-rolled plates. These microstructures were studied with transmission electron microscopy (TEM) and high-resolution electron microscopy (HREM) techniques. Phase constitution was studied using small gazing incidence angle X-ray diffraction (GAXRD) method. Martensite and amorphous phases were formed in succession as phosphorus ion implanting does increasing from 10¹⁷ to 10¹⁸ P/cm². The results show that annealing at a temperature above 773 K can mitigate the PII treatment effect and recover the microstructure.