Investigating active slip planes in tantalum under compressive load: Crystal plasticity and slip trace analyses of single crystals

Lim, Hojun; Carroll, Jay; Michael, Joseph R.; Battaile, Corbett Chandler.; Chen, Shuh Rong; Lane, J. Matthew D.

doi:10.1016/j.actamat.2019.11.030

Cited by 49 publications

(15 citation statements)

References 50 publications

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“…If the m’ equals 1, it means the grain boundary is transparent to dislocation slipping in this slip system. In body-centered cubic (BCC) metals such as α-Fe, a dislocation slip along the (111) directions was experimentally observed and verified by theoretical calculations [ 36 ]. For bcc metals, there are three possible slip families and {110}, {112}, and {123} planes along the [111] direction.…”

Section: Resultsmentioning

confidence: 98%

“…As stated in Reference [ 36 ], the punching process accompanying the hole expansion test is primarily achieved by plastic deformation, which is governed by the collective motion of dislocations along the slip planes and slip directions. To increase the HER, the dislocation transmission ability across a grain boundary should be as strong as possible.…”

Section: Resultsmentioning

confidence: 99%

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Characterization of the Stretch Flangeabitity of High-Strength Bainitic Steel: The Significance of Variant Pairs

Wang

Chen

et al. 2021

Materials

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Variant pairs have an indispensable function on mechanical properties such as low impact toughness. Therefore, it was assumed that they would also affect the HER (Hole Expansion Ratio, an indicator to evaluate stretch flanging performance). To clarify this, a comprehensive analysis of the common influential factors in an 800 MPa grade low carbon micro-alloyed steel, i.e., the retained austenite, the M/A (Martensite/Austenite) island, the titanium precipitations, the grain diameter, the density of high angle grain boundaries and the textures, was first conducted. It was found that they did not match well with the HER, suggesting that they were not the governing factor for HER in this steel. However, the dominating crystallography groups and the variant pairing results indicated that they fitted well with the HER. In the samples with high HERs, the CP (Close Packed) groups dominated the transformation, wherein one individual CP group consisted of two or more Bain groups, whereas it evolved into the domination of joint CP groups and Bain groups for the low HER sample. Further analysis on the variant pairing features indicated that a correlation occurred between the HER and the high angle variant pairs. In the steels with high HERs, high-angle variant pairs of V1/V2, V1/V3 that transformed from the same CP group, particularly of V1/V2 pair, were mostly generated. They turned to V1/V9, V1/V10, V1/V12, V1/V15, V1/V17, and V1/V18 pairs from differential CP groups, especially the V1/V12 and V1/V15 pair for low-HER steel. This result showed that V1/V2, V1/V12, and V1/V15 might have accounted most for the HER in this steel. The underlying reason was that the V1/V2 pair was specialized in supplying a slip passage for dislocation transmission across a grain boundary with little resistance, whereas the dislocation transmission ability for V1/V12 and V1/V15 pair was particularly poor. Thus, to efficiently enhance the HER, one should regulate the variant pairs by augmenting the V1/V2 fraction and suppressing the formation of the V1/V12 and V1/V15 pair.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 99%

Characterization of the Stretch Flangeabitity of High-Strength Bainitic Steel: The Significance of Variant Pairs

Wang

Chen

et al. 2021

Materials

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“…Studies of these deformation modes usually involve the mapping of the 2D microstructure, generally utilizing electron back-scattered diffraction (EBSD), alongside measurements of slip or twinning traces collected using secondary electron images, backscattered electron images, electron channeling contract imaging collected in the scanning electron microscope (SEM), high-resolution digital image correlation (HR-DIC) or atomic force miscroscopy. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] While general trends can be extracted from these combined measurements, they do not enable examination of the origin of deformation events such as slip bands within a given microstructure. For instance, slip traces observed on a specimen's free surface are a projection of a three-dimensional strain localization event that often initiates within the depth of the material.…”

Section: Introductionmentioning

confidence: 99%

A Multi-modal Data Merging Framework for Correlative Investigation of Strain Localization in Three Dimensions

Charpagne

Stinville

Polonsky

et al. 2021

JOM

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A multi-modal data-merging framework that enables the reconstruction of slip bands in three dimensions over millimeter-scale fields of view is presented. The technique combines 3D electron back-scattered diffraction (EBSD) measurements with high-resolution digital image correlation (HR-DIC) information collected in the scanning electron microscope (SEM). A typical merging workflow involves the segmentation of features within the strain field (slip bands, deformation twins) and the microstructure (grains), alignment of datasets and the projection of slip bands into the 3D microstructure, using the knowledge of the local crystallographic orientation. This method is demonstrated in two materials: a face-centered cubic (FCC) nickel-base superalloy and hexagonal close-packed (HCP) titanium alloy.

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“…These techniques have been applied to tantalum polycrystals and oligocrystals in [8,9]. They give access to plastic slip mechanisms by identification of the traces of slip lines [10], to the lattice curvature and identification of Geometrically Necessary Dislocations (GND) densities [11], and to damage mechanisms [12].…”

Section: Introductionmentioning

confidence: 99%

Experimental and Computational Approach to Fatigue Behavior of Polycrystalline Tantalum

Colas

Finot

Flouriot

et al. 2021

Metals

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This work provides an experimental and computational analysis of low cycle fatigue of a tantalum polycrystalline aggregate. The experimental results include strain field and lattice rotation field measurements at the free surface of a tension–compression test sample after 100, 1000, 2000, and 3000 cycles at ±0.2% overall strain. They reveal the development of strong heterogeneites of strain, plastic slip activity, and surface roughness during cycling. Intergranular and transgranular cracks are observed after 5000 cycles. The Crystal Plasticity Finite Element simulation recording more than 1000 cycles confirms the large strain dispersion at the free surface and shows evidence of strong local ratcheting phenomena occurring in particular at some grain boundaries. The amount of ratcheting plastic strain at each cycle is used as the main ingredient of a new local fatigue crack initiation criterion.

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Investigating active slip planes in tantalum under compressive load: Crystal plasticity and slip trace analyses of single crystals

Cited by 49 publications

References 50 publications

Characterization of the Stretch Flangeabitity of High-Strength Bainitic Steel: The Significance of Variant Pairs

Characterization of the Stretch Flangeabitity of High-Strength Bainitic Steel: The Significance of Variant Pairs

A Multi-modal Data Merging Framework for Correlative Investigation of Strain Localization in Three Dimensions

Experimental and Computational Approach to Fatigue Behavior of Polycrystalline Tantalum

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