Strain Heterogeneity and Damage Nucleation at Grain Boundaries during Monotonic Deformation in Commercial Purity Titanium

Journal Article · Thu Jan 01 04:00:00 EST 2009 · Journal of the Minerals Metals & Materials Society (JOM)

DOI:https://doi.org/10.1007/s11837-009-0180-x· OSTI ID:969775

Bieler, T. R. ^[1]; Crimp, M. A. ^[1]; Yang, Y. ^[1]; Eisenlohr, P. ^[2]; Mason, D. E. ^[3]; Liu, W. ^[4]; Ice, Gene E ^[5]

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1. Michigan State University, East Lansing
2. Max-Planck-Institut fur Eisenforschung, Germany
3. Albion College
4. Argonne National Laboratory (ANL)
5. ORNL

Heteroeneous strain was analyzed in polycrystalline, commercial-purity titanium using many experimental techniques that provide information about microstructure, dislocation arrangement, grain orientation, orientation gradients, surface topography, and local strain gradients. The recrystallized microstructure with 50-200 ?m grains was extensively characterized before and after deformation using 4-point bending to strains between 2% and 15%. Extremely heterogeneous deformation occurred along some grain boundaries, leading to orientation gradients exceeding 10{sup o} over 10-20 {micro}m. Patches of highly characterized microstructure were modeled using crystal plasticity finite element (CPFE) analysis to simulate the deformation to evaluate the ability of the CPFE model to capture local deformation processes. Damage nucleation events were identified that are associated with twin interactions with grain boundaries. Progress toward identifying fracture initiation criteria based upon slip and twin interactions with grain boundaries is illustrated with related CPFE simulations of deformation in a TiAl alloy.

• Research Organization: Oak Ridge National Laboratory (ORNL)
• Sponsoring Organization: SC USDOE - Office of Science (SC)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 969775
• Journal Information: Journal of the Minerals Metals & Materials Society (JOM), Journal Name: Journal of the Minerals Metals & Materials Society (JOM) Journal Issue: 12 Vol. 61; ISSN 1047-4838
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
DEFORMATION
DISLOCATIONS
GRAIN BOUNDARIES
GRAIN ORIENTATION
MATHEMATICAL MODELS
MICROSTRUCTURE
NUCLEATION
ORIENTATION
POLYCRYSTALS
SLIP
STRAINS
TITANIUM
TITANIUM ALLOYS
TWINNING