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The evolution of texture and microstructure uniformity in tantalum sheets during asymmetric cross rolling

Zhu, Jialin ; Liu, Shifeng ; Long, Doudou ; Zhou, Shiyuan ; Zhu, Yulong and Orlov, Dmytro LU orcid (2020) In Materials Characterization 168.
Abstract

The evolution of texture and microstructure uniformity in tantalum (Ta) sheets for sputtering target applications is analyzed in detail across the thickness during asymmetric cross rolling (ACR). Three samples with different strains, i.e. 60%, 70% and 80% are obtained via ACR processing. X-ray diffraction suggests that the increase of strain during ACR results in the randomization of deformation texture across the sample thickness due to the penetration of shear strain into the center. Electron backscatter diffraction results indicate that the increasing strain in ACR can alleviate region-dependent microstructure inhomogeneity. This is also confirmed by the distributions of Vickers hardness and geometrically necessary dislocations.... (More)

The evolution of texture and microstructure uniformity in tantalum (Ta) sheets for sputtering target applications is analyzed in detail across the thickness during asymmetric cross rolling (ACR). Three samples with different strains, i.e. 60%, 70% and 80% are obtained via ACR processing. X-ray diffraction suggests that the increase of strain during ACR results in the randomization of deformation texture across the sample thickness due to the penetration of shear strain into the center. Electron backscatter diffraction results indicate that the increasing strain in ACR can alleviate region-dependent microstructure inhomogeneity. This is also confirmed by the distributions of Vickers hardness and geometrically necessary dislocations. Taylor model analysis along with strain contouring maps suggest that relatively low and centralized number of active slip systems in the 80% sample effectively reduces strain concentrations and thus homogenizes the average shear strain of most active slip system in different grain orientations. Upon annealing, nuclei with random orientations can grow evenly from the deformed matrix in the 80% sample because of relatively homogeneous grain fragmentation and random deformation texture. These contribute to uniform and fine grain size combined with random crystallographic orientations after the completion of recrystallization.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Asymmetric cross rolling, Microstructure, Recrystallization, Strain, Taylor model, Texture
in
Materials Characterization
volume
168
article number
110586
publisher
Elsevier
external identifiers
  • scopus:85090365731
ISSN
1044-5803
DOI
10.1016/j.matchar.2020.110586
language
English
LU publication?
yes
id
5b218b17-cb59-4ed2-865b-5ee3622a9d57
date added to LUP
2020-09-24 09:04:43
date last changed
2022-04-19 00:44:40
@article{5b218b17-cb59-4ed2-865b-5ee3622a9d57,
  abstract     = {{<p>The evolution of texture and microstructure uniformity in tantalum (Ta) sheets for sputtering target applications is analyzed in detail across the thickness during asymmetric cross rolling (ACR). Three samples with different strains, i.e. 60%, 70% and 80% are obtained via ACR processing. X-ray diffraction suggests that the increase of strain during ACR results in the randomization of deformation texture across the sample thickness due to the penetration of shear strain into the center. Electron backscatter diffraction results indicate that the increasing strain in ACR can alleviate region-dependent microstructure inhomogeneity. This is also confirmed by the distributions of Vickers hardness and geometrically necessary dislocations. Taylor model analysis along with strain contouring maps suggest that relatively low and centralized number of active slip systems in the 80% sample effectively reduces strain concentrations and thus homogenizes the average shear strain of most active slip system in different grain orientations. Upon annealing, nuclei with random orientations can grow evenly from the deformed matrix in the 80% sample because of relatively homogeneous grain fragmentation and random deformation texture. These contribute to uniform and fine grain size combined with random crystallographic orientations after the completion of recrystallization.</p>}},
  author       = {{Zhu, Jialin and Liu, Shifeng and Long, Doudou and Zhou, Shiyuan and Zhu, Yulong and Orlov, Dmytro}},
  issn         = {{1044-5803}},
  keywords     = {{Asymmetric cross rolling; Microstructure; Recrystallization; Strain; Taylor model; Texture}},
  language     = {{eng}},
  month        = {{10}},
  publisher    = {{Elsevier}},
  series       = {{Materials Characterization}},
  title        = {{The evolution of texture and microstructure uniformity in tantalum sheets during asymmetric cross rolling}},
  url          = {{http://dx.doi.org/10.1016/j.matchar.2020.110586}},
  doi          = {{10.1016/j.matchar.2020.110586}},
  volume       = {{168}},
  year         = {{2020}},
}