The martensitic transformation behavior of a Ti-Ni alloy irradiated by proton with different doses has been investigated. It is found that the samples irradiated by 150 keV protons have a two-step phase transformation during heating and only one-step transformation during cooling. The exothermic peak at higher temperature disappears during the following thermal cycling. A model based on the stress-assisted martensitic transformation was established by the Transport of Ions in Matter (TRIM) calculations in order to explain the transformation behavior.
Gao, Z. Y., Wang, H. Z., Zhu, Y. Y., Meng, X. L., & Cai, W. (2015). The martensitic transformation of Ti-Ni shape memory thin films under proton irradiation. In Thin Solid Films (Vol. 584, pp. 369–371). Elsevier. https://doi.org/10.1016/j.tsf.2015.01.023