Application of electron channelling contrast to the investigation of strain localization effects in cyclically deformed fcc crystals

Schwab, A.; Bretschneider, J.; Buque, Cesar; Blochwítz, C.; Holste, C.

doi:10.1080/095008396179986

Cited by 76 publications

(35 citation statements)

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“…Furthermore, the authors highlighted that this relatively simple and efficient technique has a supplementary character to TEM investigations due to its advantages of simple specimen preparation and large field of view. Few years later, Schwab et al [32] showed that dislocation glide localization phenomena like the "ladder-like" structure of dislocation walls in persistent slip bands (PSBs) occurring in nickel polycrystals after fatigue can be studied by the ECCI technique in a conventional SEM equipped with tungsten cathode and using the low-tilt ECCI configuration. Thus, it was possible to obtain statistically provided geometrical parameters (thickness of dislocation walls, thickness of dislocation free channels, etc.)…”

Section: Imaging Of Dislocation Arrangements After Fatiguementioning

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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Section: Imaging Of Dislocation Arrangements After Fatiguementioning

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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“…This technique not only can provide a real and wide view of dislocation substructures conveniently, but also makes it possible to establish the relationship between dislocation arrangements and crystallographic characterization of the deformed crystals. In particular, the dislocation arrangements at some special sites, such as PSBs [36][37][38], grain boundaries (GBs) [40,41,43] and the front of the crack [42,44], can be successfully revealed by this technique. Thus, in the present work, the ECC technique was utilized to examine the dislocation arrangements near fatigue cracks and within DBs over the whole surface of the crystal specimen.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, in the present study, a typical singleslip oriented crystal was employed to avoid the activation of secondary slip systems, and the investigation was focused on the fatigue cracking mechanism within DBs. Meanwhile, the electron channeling contrast (ECC) technique in conventional scanning electron microscopy (SEM) has received much interest in studying dislocation arrangements in deformed materials [35][36][37][38][39][40][41][42][43]. This technique not only can provide a real and wide view of dislocation substructures conveniently, but also makes it possible to establish the relationship between dislocation arrangements and crystallographic characterization of the deformed crystals.…”

Section: Introductionmentioning

confidence: 99%

Evolution and microstructural characteristics of deformation bands in fatigued copper single crystals

2001

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“…Moreover, it needs special preparation of thin foils and cutting the specimen. Using the channelling contrast of backscattered electrons in a scanning electron microscope (SEM) [1,2] allows dislocation distributions to be imaged on larger areas containing several grains. Promising techniques are those which can combine high resolution analysis of plastic deformation marks and large areas of analysis with a high number of grains at different locations of the specimen without destroying the specimen.…”

Section: Introductionmentioning

confidence: 99%

Plastic Deformation Quantified by Atomic Force Microscopy Measurements for Duplex Stainless Steel under Monotonic and Cyclic Loading

Serre

Salazar

Vogt

2008

AMM

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Abstract. By atomic force microscopy, the plastic deformation marks resulting from monotonic and cyclic plastic deformation were analysed to study the plasticity in each phase of Duplex Stainless Steels. In austenite, straight slip bands were observed after monotonic loading. These straight slip bands seem to serve as fatigue extrusion nucleation sites, which are the marks of the accommodation of the cyclic plasticity by the austenite. In ferrite, after monotonic loading, slip bands, could be classified into two different groups depending on whether they result from the bulk activities of ferrite or whether their formation is assisted by the plastic deformation of austenite. It was found that the crystallographic misorientation based on a Kurdjomov-Sachs relationship is the factor controlling one or the other type. After the first 5 loading cycles, the ferrite presents only monotonic plastic marks. This suggests no direct contribution of the ferrite to the accommodation of the cyclic plasticity.

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Application of electron channelling contrast to the investigation of strain localization effects in cyclically deformed fcc crystals

Cited by 76 publications

References 0 publications

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

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

Evolution and microstructural characteristics of deformation bands in fatigued copper single crystals

Plastic Deformation Quantified by Atomic Force Microscopy Measurements for Duplex Stainless Steel under Monotonic and Cyclic Loading

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