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[18] I. Kaur, Yu. Mishin and W. Gust: Fundamentals of Grain and Interphase Boundary Diffusion (John Wiley, Chichester 1995). Discussion H. Mehrer: Could you please comment on recrystallization of nanocrystalline nickel and titanium? Yu. Kolobov: The recrystallization temperature of nanocrystalline nickel and titanium is approximately 250°C and 350°, respectively. During the creep tests there were no recrystallization. B. Bokstein: What are the methods of sectioning in your GB diffusion experiments? Yu. Kolobov: We use two methods of sectioning: mechanical and ion-beam. B. Bokstein: DGB in nanomaterials exceed DGB in the coarse grained materials by 10-102. For what properties is it important? Only for creep? Or also for something else? Are these 102 at the scatter range of in nanostructured metals? Yu. Kolobov: The increase of DGB influences practically all mechanical properties controlled by diffusion. That is creep, superplasticity, influence of the environment on the above mentioned properties. Of coarse, our scatter is large, and it is large also for other data obtained in the direct diffusion investigations too. However, temperature shifts of the maximal effect of creep activation and superpasticity occurence give us the additional information. These shifts allow us to make our estimations for GB diffusivity in nanostructured metals in comparison with coarse-grained ones. Dr. L. Demchenko and prof. Yu. Makogon

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