ENGLISH

Probing Crystal Plasticity at the Nanoscales: Synchrotron X-ray Microdiffraction

By Arief Suriadi Budiman

Book information

Publisher
Springer-Verlag Singapur
Year
2015
ISBN
978-981-287-334-7, 978-981-287-335-4
DOI
10.1007/978-981-287-335-4
Language
english
Format
PDF
Filesize
6 MB (6333113 bytes)
Series
SpringerBriefs in Applied Sciences and Technology
Edition
1
Pages
118\123
Time added
2015-02-17 02:00:00
Characterization and Evaluation of Materials; Nano

Description

This Brief highlights the search for strain gradients and geometrically necessary dislocations as a possible source of strength for two cases of deformation of materials at small scales: nanoindented single crystal copper and uniaxially compressed single crystal submicron gold pillars. When crystalline materials are mechanically deformed in small volumes, higher stresses are needed for plastic flow. This has been called the "Smaller is Stronger" phenomenon and has been widely observed. studies suggest that plasticity in one case is indeed controlled by the GNDs (strain gradient hardening), whereas in the other, plasticity is not controlled by strain gradients or sub-structure hardening, but rather by dislocation source starvation, wherein smaller volumes are stronger because fewer sources of dislocations are available (dislocation starvation hardening).

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