Quantifying the mesoscopic shear strains in plane strain compressed polycrystalline zirconium

Keskar, N.; Mukherjee, Sankha; Krishna, K.V. Mani; Srivastava, D.; Dey, G.K.; Pant, Prita; Doherty, R.D.; Samajdar, I.

doi:10.1016/j.actamat.2014.01.023

Cited by 28 publications

(17 citation statements)

References 61 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Near grain boundary shear strains were estimated through a newly developed [42] EBSD-DIC technique. The objective of this exercise was to explore the possible role of near boundary shear in deformation twinning.…”

Section: Discussionmentioning

confidence: 99%

“…An earlier study [42] had used EBSD-based DIC (digital image correlation). This enabled extraction of near boundary mesoscopic shear (NBMS) in SCDPSC Zircaloy-4.…”

Section: A Experimentalmentioning

confidence: 99%

“…The same conclusion was found valid for other strains as well. The NBMS can be represented as [42] maximum shear strain, grain average shear strain, and local shear strains. The first two are in number fractions of the associated pixels, while local shear was represented in terms of area fractions.…”

Section: A Experimentalmentioning

confidence: 99%

“…One pair of samples had similar initial crystallographic texture but different grain size distributions, while another pair had the same grain size distribution but different starting textures. This study also employed a recently developed [42] EBSD-based DIC (digital image correlation): a proven means for extracting information on near boundary mesoscopic shear (NBMS) strains. Visual identification and separation of twins and twinned regions were utilized to address the orientation dependence of deformation twinning in zirconium alloys.…”

Section: Introductionmentioning

confidence: 99%

“…Split channel die plane-strain compression (SCDPSC) is an established [40][41][42][43][44][45] methodology for direct observations on deformed microstructures. This was used in the present study as well.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Deformation Twinning in Zirconium: Direct Experimental Observations and Polycrystal Plasticity Predictions

Singh

Mahesh

Kumar

et al. 2015

Metall Mater Trans A

Self Cite

View full text Add to dashboard Cite

Deformation twinning was directly observed in three commercial zirconium alloy samples during split channel die plane-strain compression. One pair of samples had similar starting texture but different grain size distributions, while another pair had similar grain size distribution but different starting textures. Extension twinning was found to be more sensitive to the starting texture than to the grain size distribution. Also, regions of intense deformation near grain boundaries were observed. A hierarchical binary tree-based polycrystal plasticity model, implementing the Chin-Hosford-Mendorf twinning criterion, captured the experimentally observed twinning grains' lattice orientation distribution, and the twin volume fraction evolution, provided the critical resolved shear stress for extension twinning, s 0 ; was assumed much larger than any of the values reported in the literature, based on the viscoplastic self-consistent model. A comparison of the models suggests that s 0 obtained using the present model and the viscoplastic self-consistent models physically correspond to the critical stress required for twin nucleation, and twin growth, respectively.

show abstract

Section: Discussionmentioning

confidence: 99%

“…An earlier study [42] had used EBSD-based DIC (digital image correlation). This enabled extraction of near boundary mesoscopic shear (NBMS) in SCDPSC Zircaloy-4.…”

Section: A Experimentalmentioning

confidence: 99%

Section: A Experimentalmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%