Crack opening due to deformation twin shear at grain boundaries in near-γ TiAl

Simkin, B.A.; Ng, B. C.; Crimp, M. A.; Bieler, T. R.

doi:10.1016/j.intermet.2006.03.005

Cited by 69 publications

(29 citation statements)

References 11 publications

(6 reference statements)

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“…This theoretically revealed statement is well consistent with the corresponding experimental data [33,34] and computer simulations. [32] Within our theoretical approach, the key critical parameters influencing the crack generation process at deformation twins stopped by GBs are revealed to be the twin width, the angle of intersection of deformation twin and GB plane, and the external stress.…”

supporting

confidence: 91%

“…The computer simulations [32] are well consistent with the experimental observations [33,34] of cracks formed at intersection sites for deformation twins and GBs in coarse-grained γ -TiAl. The papers [32][33][34] reported on computer simulations and experimental observations of crack generation in nano-and polycrystalline materials, but did not analyze the conditions for the realization of this new fracture mode. At the same time, in order to understand if the new fracture mode is typical in nanomaterials with various crystal lattices and other materials deformed by twinning, it is crucially important to reveal the conditions of crack generation at deformation twins stopped by GBs.…”

supporting

confidence: 81%

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Generation of Nanocracks at Deformation Twins in Nanomaterials

Ovid’ko

Sheĭnerman

2013

Materials Research Letters

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supporting

confidence: 91%

supporting

confidence: 81%

Generation of Nanocracks at Deformation Twins in Nanomaterials

Ovid’ko

Sheĭnerman

2013

Materials Research Letters

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“…Up to now, defined diffraction conditions based on ECP [14,22,43,44] or SACP [45,46] were necessary for the investigation of individual dislocations by ECCI. However, these methods are limited by necessary large grain sizes (ECP) or instrumental conditions (SACP) [50] is used to calculate diffraction patterns of studied ECCI areas.…”

Section: Combination Of Ecci With Other Sem Techniquesmentioning

confidence: 99%

Case studies on the application of high-resolution electron channelling contrast imaging – investigation of defects and defect arrangements in metallic materials

Weidner

Biermann

2015

Philosophical Magazine

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In 1967, Coates discovered the electron channelling contrast of backscattered electrons (BSEs) in scanning electron microscopy, and by this the possibility to investigate arrangements of lattice defects in deformed microstructures of materials. Since that time, a straightforward development of the scanning electron microscopes as well as of the electron channelling contrast technique took place. Nowadays, the performance of scanning electron microscopes is high enough that the resolution of electron channelling contrast imaging (ECCI) micrographs is comparable with conventional bright field transmission electron microscopy (TEM) micrographs. In the first part of the present paper, a historical review on the development of the ECCI technique starting from its discovery more than 45 years ago up to the combination with other advanced methods of scanning electron microscopy like electron backscatter diffraction or high-resolution selected area channelling patterning in the last few years is given. Major important investigations using this technique for the visualization of individual lattice defects like stacking faults (SFs) and dislocations or dislocation arrangements are chronologically summarized. The second part demonstrates that nowadays, ECCI micrographs taken in high-resolution scanning electron microscopes can be called high-resolution ECCI (HR-ECCI). It is shown that the resolution of individual SFs and dislocations in the HR-ECCI micrographs is comparable to that of conventional TEM (about 15 nm defect image width). Furthermore, the paper is demonstrating that HR-ECCI micrographs can be obtained for various types of materials after different mechanical loadings and different grain sizes ranging from large grain size of 500 μm (cast steel) down to less than 2 μm (γ-TiAl).

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“…Benedetti et al [18] also presents a reasonable method to build a relationship between the grains orientation and tensile behavior. Simkin et al [19] implements the detailed experimental characterization of the surface topography and crystallography associated with the microcracks to show the relationship between the grain orientations and the tensile behaviors.…”

Section: Mechanical Properties Microstructure and Tensile Fracture Bmentioning

confidence: 99%

Enhancement of ductility, weakening of anisotropy behavior and local recrystallization in cold-rolled Ti-6Al-4V alloy strips by high-density electropulsing treatment

Yang

Song

et al. 2014

Appl. Phys. A

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The effect of high-density electropulsing treatment (EPT) on the microstructure, mechanical properties and fracture behavior of cold-rolled Ti-6Al-4V alloy strip was investigated. The results indicated that EPT accelerated the local recrystallization process tremendously in predeformed titanium alloy. The EPT-induced microstructural change resulted in remarkably increasing elongation to failure while remained tensile strength unchanged. In addition, anisotropy behavior of mechanical property is weakened dramatically. A mechanism for rapid local recrystallization in low temperature during EPT was proposed based on the reduction of nucleation thermodynamic barrier and enhancement of atomic diffusion. Uneven fractures of different direction specimens with quasi-cleavage fracture mode were gradually evolved into uniform ductile fracture mode with transgranular dimples under EPT.

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Crack opening due to deformation twin shear at grain boundaries in near-γ TiAl

Cited by 69 publications

References 11 publications

Generation of Nanocracks at Deformation Twins in Nanomaterials

Generation of Nanocracks at Deformation Twins in Nanomaterials

Case studies on the application of high-resolution electron channelling contrast imaging – investigation of defects and defect arrangements in metallic materials

Enhancement of ductility, weakening of anisotropy behavior and local recrystallization in cold-rolled Ti-6Al-4V alloy strips by high-density electropulsing treatment

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