scholarly journals Sub-Grain Scale Digital Image Correlation by Electron Microscopy for Polycrystalline Materials during Elastic and Plastic Deformation

2015 ◽  
Vol 56 (2) ◽  
pp. 197-216 ◽  
Author(s):  
J.C. Stinville ◽  
M.P. Echlin ◽  
D. Texier ◽  
F. Bridier ◽  
P. Bocher ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Plastic Deformation ◽  
Digital Image Correlation ◽  
Digital Image ◽  
Image Correlation ◽  
Polycrystalline Materials ◽  
Elastic And Plastic Deformation

A New Methodology to Analyze Instabilities in SEM Imaging

2014 ◽  
Vol 20 (6) ◽  
pp. 1625-1637 ◽  
Author(s):  
Catalina Mansilla ◽  
Václav Ocelík ◽  
Jeff T. M. De Hosson
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Digital Image Correlation ◽  
Field Emission ◽  
Digital Image ◽  
Image Correlation ◽  
Ion Milling ◽  
Sem Imaging ◽  
Successive Generations ◽  
Scanning Electron

AbstractThis paper presents a statistical method to analyze instabilities that can be introduced during imaging in scanning electron microscopy (SEM). The method is based on the correlation of digital images and it can be used at different length scales. It consists of the evaluation of three different approaches with four parameters in total. The methodology is exemplified with a specific case of internal stress measurements where ion milling and SEM imaging are combined with digital image correlation. It is concluded that before these measurements it is important to test the SEM column to ensure the minimization and randomization of the imaging instabilities. The method has been applied onto three different field emission gun SEMs (Philips XL30, Tescan Lyra, FEI Helios 650) that represent three successive generations of SEMs. Important to note that the imaging instability can be quantified and its source can be identified.

The Wavelike Plastic Deformation of Single Crystal Copper

2009 ◽  
Vol 131 (3) ◽  
Author(s):  
Russell J. McDonald ◽  
Christos Efstathiou ◽  
Peter Kurath
Keyword(s):  
Plastic Deformation ◽  
Digital Image Correlation ◽  
Strain Rate ◽  
Single Crystal ◽  
Digital Image ◽  
Surface Deformation ◽  
Image Correlation ◽  
Nominal Strain Rate ◽  
Single Crystal Copper ◽  
Nominal Strain

The purpose of this work is to explore nonuniform plastic flow at small length- and time-scales. Pure single crystal copper tensile specimens were pulled along the [6¯ 5 6] crystal axis at three nominal strain-rates: 0.01%/s, 0.04%/s, and 0.10%/s. Simultaneously, the surface deformation was monitored with in situ digital image correlation over a length-scale of ∼100 μm and a time-scale of 0.07–0.2 s. Sequential digital image correlation strain-rate fields show compelling evidence of a wavelike plastic deformation that is proportional to the nominal strain-rate and decelerates with increasing strain hardening. While a mechanism responsible for the waves is not identified, a methodology correlating observations of multiple researchers is forwarded.

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