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Strain-hardening in submicron silicon pillars and spheres
- Source :
- Acta Materialia. 60:2471-2478
- Publication Year :
- 2012
- Publisher :
- Elsevier BV, 2012.
-
Abstract
- Measurements of submicron spheres and pillars of silicon single crystals have exhibited a strain-hardening capacity equal to or greater than their metallic counterparts. Stress–strain characteristics are reported for diameters ranging from 40 to 400 nm. Evaluations were performed with nanoindentation-based atomic force, scanning and transmission electron microscopies. Values of strain-hardening exponents up to unity in nanospheres are attributed to a size effect variation on the rate of increase of contact area with deformation. A surface-mediated dislocation nucleation concept is shown to be consistent with length scale effects partially modified by geometry as well as size. It is proposed, but not proven, that the modification relates to greater constraint in compact spheres as opposed to tall pillars.
- Subjects :
- Length scale
Materials science
Polymers and Plastics
Silicon
Metals and Alloys
Nucleation
chemistry.chemical_element
Nanotechnology
Strain hardening exponent
Nanoindentation
Electronic, Optical and Magnetic Materials
chemistry
Ceramics and Composites
Composite material
Deformation (engineering)
Dislocation
Contact area
Subjects
Details
- ISSN :
- 13596454
- Volume :
- 60
- Database :
- OpenAIRE
- Journal :
- Acta Materialia
- Accession number :
- edsair.doi...........e4e85846341e7f28a9bd71080f65e2ad