Effect of pre-straining on the size effect in molybdenum pillars |
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| Authors: | A.S. Schneider B.G. Clark C.P. Frick P.A. Gruber E. Arzt |
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| Affiliation: | 1. Max Planck Institute for Metals Research , Heisenbergstrasse 3, 70569 Stuttgart, Germany;2. INM–Leibniz Institute for New Materials and Saarland University , Campus 5 D2 2, 66123 Saarbrücken, Germany andreas.schneider@inm-gmbh.de;4. Sandia National Labs , PO Box 5800, MS 1423, Albuquerque, NM 87185, USA;5. Mechanical Engineering Department , University of Wyoming , 1000 East University Avenue, Laramie, WY 82071, USA;6. Karlsruhe Institute of Technology , izbs-Institute for Reliability of Components and Systems, Engelbert-Arnold-Stra?e 4, 76131 Karlsruhe, Germany;7. INM–Leibniz Institute for New Materials and Saarland University , Campus 5 D2 2, 66123 Saarbrücken, Germany;8. Saarland University , 66123 Saarbrücken, Germany |
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| Abstract: | The effect of prior deformation on mechanical behavior as a function of size is investigated for body-centered cubic (bcc) molybdenum (Mo) pillars. Experiments were performed using focused ion beam (FIB) manufactured [0 0 1] and [2 3 5] Mo micro/nanopillars, which were compressed, re-FIB machined, and compressed again. Unlike in bulk materials, pre-straining has a negligible effect on stress–strain behavior of the pillars, suggesting that dislocation storage does not occur in small-scale bcc specimens. The prevailing mechanism behind the size effect is attributed to dislocation nucleation mechanisms. |
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| Keywords: | micropillar compression bcc Mo pre-straining |
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