Digital Image Correlation of Heterogeneous Deformation in Polycrystalline Material with Electron Backscatter Diffraction

Esquivel, J.; Sangid, Michael D.

doi:10.1017/s1431927615006625

Cited by 7 publications

(5 citation statements)

References 4 publications

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“…High resolution digital image correlation (HR-DIC) was performed on each of the specimens. The samples were speckled with a self-assembled Au nano-particles as described by Kammers and Daly [21] with procedure outlined in [22]. Soak time for the Ti-6Al-4V specimens in the Au nano-particles solution varied from 5 to 10 days to produce a dense enough correlation pattern.…”

Section: Methodsmentioning

confidence: 99%

Strain localization in Ti-6Al-4V Widmanstätten microstructures produced by additive manufacturing

Book

Sangid

2016

Materials Characterization

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Although Additive Manufacturing (AM) offers numerous performance advantages over existing methods, AM structures are not being utilized for critical aerospace and mechanical applications due to uncertainties in their structural integrity as a result of microstructural variations and defects arising from the AM process itself. With strain localization serving as a precursor for material failure, the impact of microstructural variations in Direct Metal Laser Sintering (DMLS) produced Ti-6Al-4V on strain localization is investigated through high resolution digital image correlation as a result of monotonic and cyclic loading for both stress relieved and mill annealed specimens. From the experimental characterizations, it was observed that the former β phase boundaries that enclose separate microtextured regions and the α lathe's major axis orientations play a critical role in the localization of strain with respect to the Widmanstätten microstructures exhibited by DMLS Ti-6Al-4V. The results show a potential opportunity to improve the performance of DMLS produced Ti-6Al-4V by decreasing the size of the β grains during the solidification process through higher cooling rates and a build strategy that avoids the reheating of solidified material as much as possible to prevent β grain growth.

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Section: Methodsmentioning

confidence: 99%

Strain localization in Ti-6Al-4V Widmanstätten microstructures produced by additive manufacturing

Book

Sangid

2016

Materials Characterization

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“…Digital image correlation (DIC) involves tracking features on the material surface, in order to obtain a spatial field of the displacement and associated strain. As demonstrated by several researchers [26][27][28][29][30][31][32][33], since this method is scale invariant, DIC can be performed within a scanning electron microscope (SEM) to provide high resolution strain mapping. Further to understand the role of temperature, DIC has been used at elevated temperatures using optical methods [34], ultraviolet optics [35], and electron microscopy [28,36,37].…”

Section: Introductionmentioning

confidence: 99%

Fatigue strain mapping via digital image correlation for Ni-based superalloys: The role of thermal activation on cube slip

Mello¹,

Nicolas²,

Sangid³

2017

Materials Science and Engineering: A

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A deformation mechanism map for a Ni-based superalloy is presented during cyclic loading at low (300°C), intermediate (550°C), and high (700°C) temperatures for low (0.7%) and high (1.0%) applied strain amplitudes. Strain mapping is performed via digital image correlation (DIC) during interrupted fatigue experiments at elevated temperatures at 1, 10, 100 and 1000 cycles, for each specified loading and temperature condition. The DIC measurements are performed in a scanning electron microscope, which allows high-resolution measurements of heterogeneous slip events and a vacuum environment to ensure stability of the speckle pattern for DIC at high temperatures. The cumulative fatigue experiments show that the slip bands are present in the first cycle and intensify with number of cycles; resulting in highly localized strain accumulation. The strain mapping results are combined with microstructure characterization via electron backscatter diffraction. The combination of crystal orientations and high-resolution strain measurements was used to determine the active slip planes. At low temperatures, slip bands follow the {111} octahedral planes. However, as temperature increases, both the {111} octahedral and {100} cubic slip planes accommodate strain. The activation of cubic slip via cross-slip within the ordered intermetallic γ' phase has been well documented in Ni-based superalloys and is generally accepted as the mechanism responsible for the anomalous yield phenomenon. The results in this paper represent an important quantifiable study of cubic slip system activity at the mesoscale in polycrystalline γ-γ' Ni-based superalloys, which is a key advancement to calibrate the thermal activation components of polycrystalline deformation models.

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“…[4,5] Through the analysis of the strain field of the material, researchers can better understand and improve the properties of materials. [6][7][8] With the development of microstructural characterization techniques in recent years, the strain field in the distorted region can be analyzed by various experimental means, such as X-ray diffraction, [9][10][11][12] Raman scattering, [13] electron backscatter-diffraction, [14][15][16][17] neutron diffraction, [18,19] 4D scanning transmission DOI: 10.1002/crat.202100264 electron microscopy, [20] nano-beam electron diffraction, [21] high-resolution transmission electron microcopy and quantum mechanism, [22,23] and an improved flat-island approach. [24] Along with the great progress of the computer digital-image processing technology, the point-to-point resolution recognition technology of the super microscope technology has also made a breakthrough improvement.…”

Section: Introductionmentioning

confidence: 99%

Center Atom Model for Strain Mapping of Void and Crack of Atomic Lattice Image

Ying-jun

Kun

et al. 2022

Cryst. Res. Technol.

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Aiming at the strain distribution around the atomic lattice defect with void and crack in crystal materials, a new elastic strain calculation method named as center atom model (CAM) is proposed in this work, and is applied for mapping the strain field of the defect with void in an atomic image lattice in real space under external forcing. As an example, the strain mapping of voids and cracks of an atomic lattice image from phase field crystal (PFC) model is quantitatively characterized by CAM. The results show that CAM can well be used to extract the strain information from various types of the defect surface of atomic lattice images. Wherever the strain distribution around the dislocation of the grain boundary or the strain around the void and crack is, CAM can accurately extract the strain distribution of the distortion area of the atomic lattice. CAM can also be easily extended and applied to the strain mapping of the defects in the heterogeneous interface.

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Digital Image Correlation of Heterogeneous Deformation in Polycrystalline Material with Electron Backscatter Diffraction

Cited by 7 publications

References 4 publications

Strain localization in Ti-6Al-4V Widmanstätten microstructures produced by additive manufacturing

Strain localization in Ti-6Al-4V Widmanstätten microstructures produced by additive manufacturing

Fatigue strain mapping via digital image correlation for Ni-based superalloys: The role of thermal activation on cube slip

Center Atom Model for Strain Mapping of Void and Crack of Atomic Lattice Image

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