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Structure and Grain Boundaries of Ultrafine-Grained Nickel after Rolling and Forging at Cryogenic Temperature

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Abstract:

The structure and misorientations of grain boundaries of ultrafine-grained nickel subjected to rolling and forging at liquid nitrogen temperature are studied. It is shown that as a result of rolling in UFG nickel obtained by the ECAP the forming of a band fragmented structure with the formation of special twin boundaries Σ3 is observed. An increase in the strain rate (forging) leads to the appearance of localized deformation bands in which the formation of new small grains is observed through dynamic recrystallization. The development of recrystallization results in increase up to 7% in UFG nickel the fraction of special twin boundaries Σ3 which are similar in nature to annealing twins.

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Materials and Processing Technology IV

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Periodical:

Solid State Phenomena (Volume 313)

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31-40

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https://doi.org/10.4028/www.scientific.net/SSP.313.31

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Online since:

January 2021

Authors:

Evgeny V. Naydenkin*, Ivan P. Mishin

Keywords:

Cryogenic Temperature, Forging, Nickel, Rolling, Ultrafine-Grained Structure

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© 2021 Trans Tech Publications Ltd. All Rights Reserved

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