Quantifying the mesoscopic shear strains in plane strain compressed polycrystalline zirconium

An algorithm is used to estimate mesoscopic strains in a deformed polycrystalline material. This requires comparison of microstructures before and after imposed macroscopic plastic deformations, in order to estimate the local/mesoscopic strains from the displacements of identifiable grain boundary s...

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Bibliographic Details
Published in:Acta materialia 2014-05, Vol.69, p.265-274
Main Authors: Keskar, N., Mukherjee, S., Mani Krishna, K.V., Srivastava, D., Dey, G.K., Pant, P., Doherty, R.D., Samajdar, I.
Format: Article
Language:English
Subjects:
Algorithms
Applied sciences
Digital image correlation (DIC)
Electron backscattered diffraction (EBSD)
Estimates
Exact sciences and technology
Grain boundaries
Grains
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Plane strain
Plastic deformation
Shear strain
Strain
Zirconium
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Summary:An algorithm is used to estimate mesoscopic strains in a deformed polycrystalline material. This requires comparison of microstructures before and after imposed macroscopic plastic deformations, in order to estimate the local/mesoscopic strains from the displacements of identifiable grain boundary segments. The algorithm was applied to lightly plane strain compressed (PSC) polycrystalline zirconium. Very large (up to 1.2) near-boundary mesoscopic shear strains were estimated. These were well above the estimated measurement uncertainties and remarkably larger than the extremely small (0.01–0.04) PSC strains imposed. Opposing local shears, on both sides of a grain boundary, appeared to compensate each other. Direct correlations were noted, in the same grain, between mesoscopic shear strains and (i) in-grain misorientations and (ii) subsequent grain fragmentation.
ISSN:1359-6454
1873-2453
DOI:10.1016/j.actamat.2014.01.023