Determination of the strain-rate sensitivity of ultrafine-grained materials by spherical nanoindentation

Feldner P, Merle B, Göken M (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: 1466-1473

Journal Issue: 8

DOI: 10.1557/jmr.2017.69

Abstract

The strain-rate sensitivity of the flow stress represents a crucial parameter for characterizing the deformation kinetics of a material. In this work a new method was developed and validated for determining the local strain-rate sensitivity of the flow stress at different plastic strains. The approach is based on spherical nanoindentation strain-rate jump tests during one deformation experiment. In the case of ultrafine-grained Al and ultrafine-grained Cu good agreement between this technique and macroscopic compression tests has been achieved. In contrast to this, individual spherical nanoindentation experiments at constant strain-rates resulted in unrealistically high strain-rate sensitivities for both materials because of drift influences. Microstructural investigations of the residual spherical imprints on ultrafine-grained Al and ultrafine-grained Cu revealed significant differences regarding the deformation structure. For ultrafine-grained Cu considerably less activity of grain boundary sliding has been observed compared to ultrafinegrained Al.

Authors with CRIS profile

Patrick Feldner Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften) Benoit Merle Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften) Mathias Göken Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)

Additional Organisation(s)

Exzellenz-Cluster Engineering of Advanced Materials (EAM) Graduiertenkolleg 1896/2 In situ Mikroskopie mit Elektronen, Röntgenstrahlen und Rastersonden Interdisziplinäres Zentrum, Center for Nanoanalysis and Electron Microscopy (CENEM) Lehrstuhl für Werkstoffwissenschaften (Allgemeine Werkstoffeigenschaften)

Related research project(s)

In-situ nanomechanics and FIB tomography of thin films (EXC315 EAM (A2-3)) Exzellenz-Cluster Engineering of Advanced Materials Nov. 1, 2012 - Oct. 31, 2017

How to cite

APA:

Feldner, P., Merle, B., & Göken, M. (2017). Determination of the strain-rate sensitivity of ultrafine-grained materials by spherical nanoindentation. Journal of Materials Research, 32(8), 1466-1473. https://doi.org/10.1557/jmr.2017.69

MLA:

Feldner, Patrick, Benoit Merle, and Mathias Göken. "Determination of the strain-rate sensitivity of ultrafine-grained materials by spherical nanoindentation." Journal of Materials Research 32.8 (2017): 1466-1473.

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