Experimental characterization and crystal plasticity modeling of heterogeneous deformation in polycrystalline {alpha}-Ti.

Journal Article · Tue Mar 01 04:00:00 EST 2011 · Metall. Mater. Trans. A

DOI:https://doi.org/10.1007/s11661-010-0249-8· OSTI ID:1019261

Wang, L; Barabash, R I; Yang, Y; Bieler, T R; Crimp, M A; Eisenlohr, P; Liu, W; Ice, G E ^[1]

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1. X-Ray Science Division

Grain-level heterogeneous deformation was studied in a polycrystalline {alpha}-Ti specimen deformed by four-point bending. Dislocation slip activity in the microstructure was investigated by surface slip trace analysis. Three-dimensional-X-ray diffraction (3D-XRD) was used to investigate subsurface lattice rotations and to identify geometrically necessary dislocations (GNDs). The slip systems of local GNDs were analyzed by studying the streaking directions of reflections in corresponding Laue patterns. The analysis performed in one grain indicated that the subsurface GNDs were from the same slip system identified using slip trace analysis in backscattered electron images. A crystal plasticity finite element (CPFE) model was used to simulate deformation of the same microstructural region. The predictions of dislocation slip activity match the general aspects of the experimental observations, including the ability to simulate the activation of different slip systems in grains where multiple slip systems were activated. Prediction of local crystal rotations, however, was the least accurate aspect of the CPFE model.

• Research Organization: Argonne National Laboratory (ANL)
• Sponsoring Organization: SC; NSF
• DOE Contract Number: AC02-06CH11357
• OSTI ID: 1019261
• Report Number(s): ANL/XSD/JA-70541
• Journal Information: Metall. Mater. Trans. A, Journal Name: Metall. Mater. Trans. A Journal Issue: 3 ; Mar. 2011 Vol. 42; ISSN 1073-5623
• Country of Publication: United States
• Language: ENGLISH

Related Subjects

36 MATERIALS SCIENCE
BENDING
DEFORMATION
DIFFRACTION
DISLOCATIONS
ELECTRONS
FORECASTING
MICROSTRUCTURE
PLASTICITY
SIMULATION
SLIP