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 · JOM

DOI:https://doi.org/10.1007/s11837-009-0180-x· OSTI ID:977377

Bieler, T R; Crimp, M A; Yang, Y; Wang, L; Eisenlohr, P; Mason, D E; Liu, W; Ice, G E

Heterogeneous 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 {micro}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 micro-structure 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: Argonne National Laboratory (ANL)
• Sponsoring Organization: SC; NIH; DOD
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 977377
• Report Number(s): ANL/XSD/JA-66778
• Journal Information: JOM, Journal Name: JOM Journal Issue: 12 ; 2009 Vol. 61; ISSN 1047-4838; ISSN JOMMER
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

36 MATERIALS SCIENCE
BENDING
DEFORMATION
DISLOCATIONS
FRACTURES
GRAIN BOUNDARIES
GRAIN ORIENTATION
MICROSTRUCTURE
NUCLEATION
ORIENTATION
PLASTICITY
SLIP
STRAINS
TITANIUM
TOPOGRAPHY