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| ACTIVATION ENERGIES FOR DIFFUSION AND DIFFUSION COEFFICIENTS OF OXYGEN AND NITROGEN IN MOLYBDENUM |
| MA YING-LIANG; SON JIU-YIH |
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Cite this article:
MA YING-LIANG; SON JIU-YIH. ACTIVATION ENERGIES FOR DIFFUSION AND DIFFUSION COEFFICIENTS OF OXYGEN AND NITROGEN IN MOLYBDENUM. Acta Metall Sin, 1964, 7(1): 68-76.
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Abstract Additional evidence is presented to prove that the two internal friction peaks associated with the presence of either oxygen or nitrogen in molybdenum previously observed by internal friction measurements with a torsion pendulum (two internal friction peaks of oxygen occurred at temperatures around 115℃ and 200℃, whereas, two of nitrogen were observed at 160℃ and 300℃ respectively) are associated with the stress-induced micro-diffusion of oxygen and nitrogen in molybdenum.Systematic investigations have been carried out to study the nature of the internal friction peaks of oxygen. The results showed that the height of the internal friction peak at 115℃ is proportional to the oxygen content in solid solution, while the height of the other internal friction peak at 200℃ is a quadratic function of the oxygen content in solid solution. The activation energies for diffusion were found to be 25.2 kcal/mole and 30 kcal/mole for the two oxygen peaks, for the nitrogen peak at 160℃ the corresponding activation energy was found to be 28.5 kcal/mole.From the above results, it is believed that the 115℃ peak may arise from the diffusion of free non-interacting interstitial oxygen, whereas, the 200℃ peak may be correlated with the diffusion of oxygen atoms each of which interacts with another oxygen atom in its neighbourhood.Theoretical diffusion coefficient curves for these systems were also obtained from the relationship between activation energies and the calculated diffusion coefficient constant.
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Received: 18 January 1964
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