Nitrogen begins to penetrate into tantalum at 700–800°C and oxygen from the air at about 300°C.
At temperatures not exceeding 1600°C, vacuum annealing of tantalum previously exposed to nitrogen and air leads to the diffusion of nitrogen and oxygen from the surface into the core of the metal.
During annealing in vacuum (1·10−4 mm Hg) oxygen and nitrogen are driven off only at temperatures of 1800–2300°C.
Nitrogen and oxygen in the solid solution greatly inhibit the grain growth of tantalum.
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E. Gulbransen and K. Andren, J. of Metals,188, No. 3 (1950).
Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 12, pp. 37–40, December, 1966.
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Gavrilyuk, M.I., Ershova, V.T. & Konstantinov, V.A. Interaction of tantalum with nitrogen and air. Met Sci Heat Treat 8, 998–1000 (1966). https://doi.org/10.1007/BF00653000
- Solid Solution
- Vacuum Annealing