Atomic force microscopy of slip lines on the surface of a fatigued nickel single crystal

Schwab, A.; Meissner, O.; Holste, C.

doi:10.1080/095008398178732

Cited by 34 publications

(11 citation statements)

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“…In contrast to PSBs in nickel (cf. [84,85]) or in copper (cf. [86,87]), the arrangement of dislocations is not in such a clear "ladder-like" structure.…”

Section: Planar Dislocation Arrangement At Early State Of Fatiguementioning

confidence: 99%

“…Two different approaches were pursued in the literature investigating the influence of PSBs/PSMs on the crack initiation and propagation [99,100]: (i) development of extrusion/intrusion profile in dependence on the number of cycles [101] and (ii) determination of the half-cycle slip activity of PSB. Schwab et al [84] as well as Hollmann [85] performed half-cycle experiments on nickel single crystals at room temperature [81] and low temperatures [85] in order to study the slip activity of PSBs. Weidner et al [62][63][64] adopted this technique for the investigation on the cyclic slip activity of PSBs in polycrystalline nickel.…”

Section: Ecci and The Slip Activity Of Psbsmentioning

confidence: 99%

“…Weidner et al [62][63][64] adopted this technique for the investigation on the cyclic slip activity of PSBs in polycrystalline nickel. The ECCI technique was complemented by EBSD and atomic force microscopy (AFM) for studying the half-cycle slip activity [84,85]. Polycrystalline nickel with mean grain size of about 70 μm was cyclically deformed with low plastic strain amplitude up to 7500 cycles and 30,000 cycles, which correspond to 0.15 and 0.6 N f , respectively [62].…”

Section: Ecci and The Slip Activity Of Psbsmentioning

confidence: 99%

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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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“…In contrast to PSBs in nickel (cf. [84,85]) or in copper (cf. [86,87]), the arrangement of dislocations is not in such a clear "ladder-like" structure.…”

Section: Planar Dislocation Arrangement At Early State Of Fatiguementioning

confidence: 99%

Section: Ecci and The Slip Activity Of Psbsmentioning

confidence: 99%

Section: Ecci and The Slip Activity Of Psbsmentioning

confidence: 99%

See 1 more Smart Citation

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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“…24 AFM has become a powerful tool to detect structural changes at the nanoscale and its popularity between materials science researchers keeps on rising. 25 Recently, AFM was used to study surface deformation during cyclic loading [26][27][28][29][30][31] and also to study the intrinsic properties of ceramic materials. 32 Furthermore, AFM can not only image with high resolution but also measure forces involved in deformation.…”

Section: Classical Mechanism Of Nanoindentationmentioning

confidence: 99%

Study of the friction, adhesion and mechanical properties of single crystals, ceramics and ceramic coatings by AFM

Roa

Oncins

Díaz

et al. 2011

Journal of the European Ceramic Society

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“…Using simple geometric relations (Schwab et al 1998, Hollmann 1999) the slip band thickness D, in the direction of the glide plane normal may be derived from v, and w,. With D, and W/ the resolved plastic shear strain Ayf B carried by the SB (i) during one half cycle can be calculated (Hollmann 1999).…”

Section: Characteristic Structure Parametersmentioning

confidence: 99%

Cyclic Plasticity of Nickel Single Crystals Fatigued at Cryogenic Temperatures

Hollman¹

2002

Journal of the Mechanical Behavior of Materials

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Nickel monocrystals oriented for single slip have been cyclically deformed at 77 Κ in the range of plastic strain amplitudes between 1.4-10" 4 and 3.5-10 " 2 up to saturation of the stress amplitude. Special attention is paid to a comparison of slip and dislocation structure phenomena observed in fatigue tests at 77 Κ and those found after cycling at room temperature and elevated temperatures. The dislocation structure has been investigated on different length scales. Using the channelling contrast technique of the scanning electron microscope as well as bright field-as weak-beam imaging technique in the transmission electron microscope, a systematic study of the dislocation structure was carried out in order to describe quantitatively the influence of the imposed plastic strain amplitude on structure parameters of 77 Ä^-deformed nickel single crystals. It turns out that nickel single crystals cyclically deformed at 77 Κ show no typical "two phase structure" consisting of persistent slip bands and matrix regions like fee metals deformed at higher deformation temperatures but they evolve a nearly "homogeneous" dislocation structure. At 77 Κ the strain is localized in narrow slip bands in the same way as at higher temperatures, although there is no indication of a "two-phase" structure. From the experimental findings it is concluded that Winter's "two-phase" model remains valid, when averaging the plastic strain values over all slip bands and over a sufficient number of cycles.

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Atomic force microscopy of slip lines on the surface of a fatigued nickel single crystal

Cited by 34 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

Study of the friction, adhesion and mechanical properties of single crystals, ceramics and ceramic coatings by AFM

Cyclic Plasticity of Nickel Single Crystals Fatigued at Cryogenic Temperatures

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