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MM: Fachverband Metall- und Materialphysik
MM 54: Topical Session: Interface-dominated phenomena - Crystallization and Microstructure Evolution
MM 54.4: Vortrag
Donnerstag, 19. März 2020, 12:30–12:45, IFW A
Impurity effect on microstructure homogeneity, recrystallization kinetics and mechanical properties in severe plastically deformed coppers — •Yao Jiang1,2, Martin Peterlechner2, Ruicong Gu1, Jingtao Wang1,3, and Gerhard Wilde2,3 — 1School of Materials Science and Engineering, Nanjing University of Science and Technology, 210094 Nanjing, P.R. China — 2Institute of Materials Physics, University of Münster, 48149 Münster, Germany — 3Herbert Gleiter Institute of Nanoscience, Nanjing University of Science and Technology, 210094 Nanjing, P.R. China
Recrystallization and mechanical behavior of ultra-fine grained (UFG) copper prepared by equal channel angular pressing and nano-lamellar (NL) copper by ECAP with additional cryogenic rolling were investigated by comparing coppers with two different purity of 4N and 3N. Discontinuous nucleation and grain growth were observed to be uncorrelated to shear bands. The discontinuous recrystallization was considered to modify JMAK model and to quantify the microstructure inhomogeneity. Moreover, the thermal stability of the NL structure was comparable to the UFG structure, due to their similar activation energy for recrystallization. Superior strength and ductility was achieved in the partially recrystallized NL structural 3N copper. The present work proposed an effective strategy to tailor the nuclei sites and grain growth of the partial recrystallization by using localized shear bands and composition.