The role of mechanical twinning on microcrack nucleation and crack propagation in a near-γ TiAl alloy

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

doi:10.1016/j.intermet.2004.03.015

Cited by 50 publications

(26 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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: 82%

See 1 more Smart Citation

Generation of Nanocracks at Deformation Twins in Nanomaterials

Ovid’ko

Sheĭnerman

2013

Materials Research Letters

View full text Add to dashboard Cite

supporting

confidence: 91%

supporting

confidence: 82%

Generation of Nanocracks at Deformation Twins in Nanomaterials

Ovid’ko

Sheĭnerman

2013

Materials Research Letters

View full text Add to dashboard Cite

“…This LCF can lead to both strengthening by work hardening, or microcracking [66], in the crack process zone. The above FCG testing strategies (i-l) are able to reproduce the salient features of the superimposed LCF and HCF loadings, and may hence determine realistic or more conservative values for K th .…”

Section: Towards a Microscopic Model For Hcf Loading Of Tial Alloys: mentioning

confidence: 99%

Recent progress in the high-cycle fatigue behaviour of γ-TiAl alloys

Edwards

2018

Materials Science and Technology

View full text Add to dashboard Cite

The high-cycle fatigue (HCF) properties of γ -TiAl (gamma titanium aluminide) alloys are reviewed, particularly with regards to the deformation mechanisms active in the near-threshold cyclic loading regime. By examining the influence of lamellar orientation and thickness on the HCF threshold, in addition to more conventional microstructural considerations such as the grain size or the volume fraction of lamellar colonies, factors to improve the γ -TiAl microstructure for HCF are assessed. Finally, experimental methods and loading strategies are surveyed to identify techniques for improving HCF testing of γ -TiAl alloys. In this, we consider both the conservativism of differing approaches and the possibility to measure with suitable resolution the local mechanical behaviour under HCF of the lamellar γ -TiAl microstructure. ARTICLE HISTORY

show abstract

“…In the last decade, the group of Crimp and co-workers [17][18][19][20][21][22] did a significant progress in the development of the ECCI technique to a robust routine alternative to TEM. In [19,20], the experimental parameters and set-up necessary to carry out ECCI as a routine method are summarized.…”

Section: Imaging Of Individual Lattice Defectsmentioning

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

View full text Add to dashboard Cite

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).

show abstract

The role of mechanical twinning on microcrack nucleation and crack propagation in a near-γ TiAl alloy

Cited by 50 publications

References 21 publications

Generation of Nanocracks at Deformation Twins in Nanomaterials

Generation of Nanocracks at Deformation Twins in Nanomaterials

Recent progress in the high-cycle fatigue behaviour of γ-TiAl alloys

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

Contact Info

Product

Resources

About