Effect of low-energy proton on the microstructure, martensitic transformation and mechanical properties of irradiated Ni-rich TiNi alloy thin films
来源期刊：International Journal of Minerals Metallurgy and Materials2020年第4期
论文作者：Hai-zhen Wang Yun-dong Zhao Yue-hui Ma Zhi-yong Gao
文章页码：538 - 543
摘 要：Ni–48.5 at%Ti thin films were irradiated in the austenite phase by different energy-level protons at a dose rate of 1.85 × 1012p/（cm2·s）, and the total dose was 2.0 × 1016p/cm2. The microstructures of the thin films before and after irradiation were evaluated by transmission electron microscopy（TEM） and grazing-incidence X-ray diffraction（GIXRD）, which showed that the volume fraction of Ti3Ni4 phase elevated with proton energy level. The influence of proton irradiation on the transformation behavior of the Ti Ni thin films was investigated by differential scanning calorimetry（DSC）. Compared with the unirradiation film, the reverse transformation start temperatures（As） decreased by about 3°C after 120 ke V proton-irradiation. The proton irradiation also had a significant effect on the mechanical properties of the Ti Ni thin films. After 120 ke V energy proton-irradiation, the fracture strength increased by 8.44%, and the critical stress increased by 21.1%. In addition,the nanoindenter measurement image showed that the hardness of the thin films increased with the increase of proton-irradiation energy. This may be due to the defects caused by irradiation, which strengthen the matrix.
Hai-zhen Wang1，Yun-dong Zhao1，Yue-hui Ma2，Zhi-yong Gao1
1. Science and Technology on Materials Performance Evaluation in Space Environment Laboratory, School of Materials Science and Engineering, Harbin Instituteof Technology2. Lanzhou Seemine SMA Co.Ltd.
摘 要：Ni–48.5 at%Ti thin films were irradiated in the austenite phase by different energy-level protons at a dose rate of 1.85 × 1012p/（cm2·s）, and the total dose was 2.0 × 1016p/cm2. The microstructures of the thin films before and after irradiation were evaluated by transmission electron microscopy（TEM） and grazing-incidence X-ray diffraction（GIXRD）, which showed that the volume fraction of Ti3Ni4 phase elevated with proton energy level. The influence of proton irradiation on the transformation behavior of the Ti Ni thin films was investigated by differential scanning calorimetry（DSC）. Compared with the unirradiation film, the reverse transformation start temperatures（As） decreased by about 3°C after 120 ke V proton-irradiation. The proton irradiation also had a significant effect on the mechanical properties of the Ti Ni thin films. After 120 ke V energy proton-irradiation, the fracture strength increased by 8.44%, and the critical stress increased by 21.1%. In addition,the nanoindenter measurement image showed that the hardness of the thin films increased with the increase of proton-irradiation energy. This may be due to the defects caused by irradiation, which strengthen the matrix.
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