Nanostructured surfaces

Temperature range of deuterium retention from ferritic-martensitic steel implanted deuterium at elevated temperatures 
O. Morozov, V.I. Zhurba, V.O. Progolaeva, V.V. Seliukova
NSC-Kharkiv Institute of Physics and Technology of the NAS of Ukraine.
1, Akademichna St., Kharkiv-61108, Ukraine.
E-mail: morozov@kipt.kharkov.ua; morozovtds@gmail.com

Deuterium thermal desorption spectra were investigated on the samples of  ferritic-martensitic steel (16Cr12W2VTiAB) implanted deuterium at temperatures 100 K, 300 or 600 K with deuterium ions in the dose range from 5×1016 to 4×1018 D/cm2. It has been determined that for low implantation doses, the thermal desorption spectrum of ion-implanted deuterium is a wide temperature range of deuterium desorption in the temperature range of 400–1000 K. As the dose increases, this temperature range of deuterium desorption expands in the direction of decreasing temperature and at a dose of 1.6×1017 D/cm2, a wide peak with a maximum temperature of 400 K appears. A further increase in the implantation dose of deuterium is accompanied by the appearance of a lower temperature region of deuterium desorption with a maximum temperature in the temperature range of 200–250 K. At doses above 8×1017 D/cm2, a qualitative change in the deuterium thermal desorption spectrum occurs, which manifests itself in the appearance of a lower temperature region of deuterium desorption in the form of a clearly pronounced peak with a maximum temperature of  ~180 K.
A further increase in the dose of implanted deuterium leads to an increase in the intensity of the lowest temperature peak of the deuterium thermal desorption spectrum, and it becomes dominant. The formation of a low-temperature intense peak in the deuterium thermal desorption spectrum may indicate the appearance of a new phase state, which can be considered as the formation of a hydride. The conclusion about the formation of a hydride was made on the basis of the data obtained by us in the study of the thermal desorption spectra of deuterium from Pd, Ti and ASS steel. These works show that the formation of hydrides is reflected in the deuterium thermal desorption spectrum by the appearance of lower temperature peaks. It is important that the formation of low-temperature deuterium desorption regions is accompanied by the appearance of a deuterium desorption region extended along the temperature scale in the temperature range of 200–1000 K.
Deuterium implantation at temperatures of 300 and 600 K leads to a significant decrease in both the temperature range of deuterium desorption and the amount of retained deuterium.