In situ study of thermally activated flow and dynamic restoration of ultrafine-grained pure Cu at 373 K

Blum W, Kral P, Dvořák J, Petrenec M, Eisenlohr P, Sklenička V (2017)

Publication Status: Published

Publication Type: Journal article

Publication year: 2017

Journal

Journal of Materials Research Springer / Materials Research Society

Publisher: CAMBRIDGE UNIV PRESS

Book Volume: 32

Pages Range: 4514-4521

Journal Issue: 24

DOI: 10.1557/jmr.2017.343

Abstract

Pure Cu was made ultrafine-grained by equal channel angular pressing on route BC at ambient temperatures and deformed in situ in a scanning electron microscope at the elevated temperature of 373 K and at a constant total strain rate of 10(-4) s(-1). Deformation was repetitively stopped to take micrographs of the grain structure on the same area of observation, revealing limited activity of discontinuous dynamic recrystallization. During the stops of deformation, the flow stress was relaxing. The relaxation of stress as function of time was used to determine the rate of inelastic deformation as a function of stress, from which the activation volume V* of the thermally activated flow was derived. It is found that the normalized values of V* were lying in the same order generally found for coarse-grained pure materials. This seems to be in conflict with the literature. However, the conflict is resolved by noting that the literature results refer to quasistationary deformation with the concurrent dynamic recovery in contrast to the present results obtained at a virtually constant microstructure. The interpretation of the two kinds of activation volumes for thermally activated flow is discussed.

Authors with CRIS profile

Wolfgang Blum Technische Fakultät

Additional Organisation(s)

Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)

Involved external institutions

Academy of Sciences of the Czech Republic (ASCR) / Akademie věd České republiky (AVČR) CZ Czech Republic (CZ) Institute of Physics of Materials CZ Czech Republic (CZ) Michigan State University US United States (USA) (US) Tescan Orsay Holding s.r.o. CZ Czech Republic (CZ)

How to cite

APA:

Blum, W., Kral, P., Dvořák, J., Petrenec, M., Eisenlohr, P., & Sklenička, V. (2017). In situ study of thermally activated flow and dynamic restoration of ultrafine-grained pure Cu at 373 K. Journal of Materials Research, 32(24), 4514-4521. https://doi.org/10.1557/jmr.2017.343

MLA:

Blum, Wolfgang, et al. "In situ study of thermally activated flow and dynamic restoration of ultrafine-grained pure Cu at 373 K." Journal of Materials Research 32.24 (2017): 4514-4521.

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