Grain boundary strain transfer and anisotropic polycrystalline deformation in commercial purity titanium

Research output: ResearchConference contribution

Abstract

The anisotropic nature of polycrystalline deformation in commercially pure titanium has been studied using an array of experimental techniques in compliment with crystal plasticity finite element method (CPFEM) simulations. Analysis has been carried out in the near surface region of a polycrystalline four-point deformation sample,where the global stress state can be approximated as uniaxial tension. Electron backscattered diffraction (EBSD) has been used to map crystal orientations, allowing the active dislocation and twinning systems to be identified based on slip trace analysis of secondary and backscattered electron images. Atomic force microscopy (AFM) measurement of slip step heights allowed quantification of the strain on active deformation systems. Dislocation slip on prism planes was identified as the primary deformation mode,being activated in many "soft" oriented grains. Nevertheless,significant activation of basal, pyramidal ,and { 10-12} extension twins were observed in grains less favorably oriented for prism slip. These observations were compared directly to a columnar 3-D FEM mesh developed to mimic the experimentally characterized microstructure patch. Computational deformation of this patch reproduces many significant characteristics of the experimentally observed deformation behavior,including many aspects of the deformation system activation,crystal rotations, and surface topography development. However,other details of the deformation behavior are not adequately captured,especially the manner in which deformation systems interact with grain boundaries.

LanguageEnglish (US)
Title of host publicationTi 2011 - Proceedings of the 12th World Conference on Titanium
Pages1061-1065
Number of pages5
Volume2
StatePublished - 2012
Event12th World Conference on Titanium, Ti 2011 - Beijing, China
Duration: Jun 19 2011Jun 24 2011

Other

Other12th World Conference on Titanium, Ti 2011
CountryChina
CityBeijing
Period6/19/116/24/11

Profile

Titanium
Grain boundaries
Prisms
Chemical activation
Finite element method
Crystals
Trace analysis
Twinning
Surface topography
Dislocations (crystals)
Electron diffraction
Crystal orientation
Plasticity
Atomic force microscopy
Microstructure
Electrons

Keywords

  • AFM
  • Anisotropy
  • CPFEM
  • Deformation
  • Dislocation
  • EBSD
  • Strain transfer
  • Titanium (Ti)
  • Twinning

ASJC Scopus subject areas

  • Ceramics and Composites

Cite this

Crimp, M. A., Yang, Y., Wang, L., Eisenlohr, P., & Bieler, T. R. (2012). Grain boundary strain transfer and anisotropic polycrystalline deformation in commercial purity titanium. In Ti 2011 - Proceedings of the 12th World Conference on Titanium (Vol. 2, pp. 1061-1065)

Grain boundary strain transfer and anisotropic polycrystalline deformation in commercial purity titanium. / Crimp, Martin A.; Yang, Yiyi; Wang, Leyun; Eisenlohr, Philip; Bieler, Thomas R.

Ti 2011 - Proceedings of the 12th World Conference on Titanium. Vol. 2 2012. p. 1061-1065.

Research output: ResearchConference contribution

Crimp, MA, Yang, Y, Wang, L, Eisenlohr, P & Bieler, TR 2012, Grain boundary strain transfer and anisotropic polycrystalline deformation in commercial purity titanium. in Ti 2011 - Proceedings of the 12th World Conference on Titanium. vol. 2, pp. 1061-1065, 12th World Conference on Titanium, Ti 2011, Beijing, China, 6/19/11.
Crimp MA, Yang Y, Wang L, Eisenlohr P, Bieler TR. Grain boundary strain transfer and anisotropic polycrystalline deformation in commercial purity titanium. In Ti 2011 - Proceedings of the 12th World Conference on Titanium. Vol. 2. 2012. p. 1061-1065.
Crimp, Martin A. ; Yang, Yiyi ; Wang, Leyun ; Eisenlohr, Philip ; Bieler, Thomas R./ Grain boundary strain transfer and anisotropic polycrystalline deformation in commercial purity titanium. Ti 2011 - Proceedings of the 12th World Conference on Titanium. Vol. 2 2012. pp. 1061-1065
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