Surface impurity diffusion-induced recrystallization of ultrafine-grained molybdenum |
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| Authors: | G. P. Grabovetskaya I. P. Mishin Yu. R. Kolobov I. V. Ratochka O. V. Zabudchenko |
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| Affiliation: | (1) Institute of Strength Physics and Materials Science of the Siberian Branch of the Russian Academy of Sciences, Russia;(2) Center for Nanostructured Materials and Nanotechnologies at Belgorod State Unuversity, Russia |
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| Abstract: | Methods of scanning and transmission electron microscopy are used to perform a comparative analysis of the structur evolution of ultrafine-grained molybdenum subjected to nickel-free annealing and to diffusion annealing accompanied by nickel penetration from the surface into the bulk of Mo(Ni) specimens. The kinetics of nickel diffusion-induced recrystallization of ultrafine-grained molybdenum in the temperature interval 1123–1223 K is investigated and the recrystallization activation energy is determined. Plausible reasons for a decrease in the nickel diffusion-induced recrystallization temperature of ultrafine-grained molybdenum as compared to its fine-grained cousin are discussed. The nickel diffusivity in ultrafine-grained molybdenum along grain boundaries is estimated on the basis of the results obtained. __________ Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika, No. 5, pp. 37–42, May, 2007. |
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