2015-Sustainable Industrial Processing Summit
SIPS 2015 Volume 1: Aifantis Intl. Symp. / Multiscale Material Mechanics
| Editors: | Kongoli F, Bordas S, Estrin Y |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2015 |
| Pages: | 300 pages |
| ISBN: | 978-1-987820-24-9 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Peculiarity of plastic deformation of α/β brass during friction
Lev Rapoport1; Louisa Meshi2; Igor Lapsker3; Alexey Moshkovich3; Vlad Perfilyev3;1HOLON INSTITUTE OF TECHNOLOGY, Holon, Israel; 2, Beer Sheva, Israel; 3, Holon, Israel;
Type of Paper: Regular
Id Paper: 488
Topic: 1
Abstract:
The dislocation structure and plastic deformation of α/β brass after friction in boundary lubrication (BL) conditions were studied. Pin-on-disk tests at different loads were performed. The microstructure was studied using SEM, TEM and AFM techniques. The friction of brass was attributed to severe plastic deformation (SPD) in thin surface layers of the α-phase grains. The SPD of surface layers is accompanied by formation of thin shear bands practically parallel to the direction of friction. The thickness of wear particles was found to be close to the thickness of shear bands. Intragranular slip, as the accommodating mechanism, occurred in α-phase, whereas little deformation was observed in the β-phase. The accommodation of sliding was accompanied by growth and coalescence of voids, formation and propagation of cracks, leading finally to delamination of the wear particles. The equivalent strain vs. the depth was evaluated. Large deformation of thin surface layers (グ = 10-12) led to formation of the nanocrystalline structure (d = 35 nm).
Keywords: Severe plastic deformation; Nanocrystalline structure; Shear bands; Friction