Please use this identifier to cite or link to this item: doi:10.22028/D291-31060
Title: Effect of Sample Size and Crystal Orientation on the Fatigue Behaviour of Single Crystalline Microbeams
Author(s): Rafael Velayarce, Jorge
Motz, Christian
Language: English
Title: Materials
Volume: 13
Issue: 3
Publisher/Platform: MDPI
Year of Publication: 2020
Free key words: fatigue
PSBs-like structures
kink bands
dislocation dipole
DDC notations: 600 Technology
Publikation type: Journal Article
Abstract: Beam deflection experiments were used to systematically examine size effects on the low cyclic fatigue (LCF) deformation behaviour of micro-sized bending beams of copper (Cu) single crystals oriented for single slip, critical and coplanar double slip. We present cyclic hardening curves and fatigue surface roughness, as well as dislocations structures of the micro-sized beams with sizes between 1 and 15 µm. A clear crystal orientation and size effect on the cyclic hardening curves, surface roughness, and the dislocation microstructures were observed. Based on the experimental results, the fatigue damage in single slip orientations clearly decreased with decreasing the sample size, however, below a critical size regime, the surface damage suddenly increases. Additionally, samples with sizes larger than 5 µm clearly revealed, besides PSBs-like structures, the emergence of kink bands leading to larger surface roughness in comparison to the smaller ones. Fatigue surface damages in microcrystals oriented for critical double slip became more prevalent compared to single slip orientations. Quantitatively, the correlation of the fatigue surface damage was also demonstrated with the formation of PSBs-like structures.
DOI of the first publication: 10.3390/ma13030741
Link to this record: urn:nbn:de:bsz:291--ds-310600
ISSN: 1996-1944
Date of registration: 29-May-2020
Faculty: NT - Naturwissenschaftlich- Technische Fakultät
Department: NT - Materialwissenschaft und Werkstofftechnik
Professorship: NT - Prof. Dr. Christian Motz
Collections:SciDok - Der Wissenschaftsserver der Universität des Saarlandes

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