日本金属学会誌

J. Japan Inst. Metals, Vol. 51, No. 3 (1987),
pp. 174-180

Thermal Desorption of Tritium from Iron

Kiyoshi Kusabiraki1, Takashi Kubo2, Takayuki Ooka1, Masao Matsuyama3 and Kuniaki Watanabe3

1Department of Metallurgical Engineering, Faculty of Engineering, Toyama University, Toyama
2Graduate Student, Toyama University, Toyama. Present address: Nippon Kokan K.K., Kawasaki
3Tritium Research Center, Toyama University, Toyama

Abstract:

The tritium thermal desorption analysis for iron was carried out in order to elucidate the trapping sites of hydrogen and to obtain the activation energy of tritium desorption from each trapping site in iron.
The results obtained in this study are as follows;
(1)  Four desorption peaks of tritium with maxima at about 500, 620, 900 and 1100 K, which were designated as peaks 1, 2, 3 and 4, respectively, were detected in both cold-rolled and annealed irons in the thermal analyses. This result suggests that there are at least four kinds of tritium trapping site in iron.
(2)  The intensity of peak 1 which appears remarkably in the cold-rolled iron decreases by annealing the specimen.
(3)  The total amount of desorbed tritium, namely the total amount of absorbed tritium, in the cold-rolled iron is much larger than that in the annealed one.
(4)  The activation energies for desorption of tritium from the trapping sites were estimated. Peaks 1, 2 and 3 in the cold-rolled iron, they were estimated to be 56.5, 75.3 and 17.6 kJ/mol, respectively. Peaks 2 and 3 in the annealed iron, they were estimated to be 31.0 and 14.2 kJ/mol, respectively. Peaks 1 and 2 can be assigned as tritium release from dislocation and/or vacancy and iron nitride precipitate, respectively.


(Received 1986/9/8)

Keywords:

hydrogen, tritium, iron, trapping site, desorption, thermal analysis, temperature programed desorption analysis, activation energy


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