Determination of Residual Stress Fields with High Local Resolution

Hasse, B.; Koçak, M.; Reimers, W.

doi:10.4028/www.scientific.net/msf.524-525.279

Cited by 4 publications

(4 citation statements)

References 5 publications

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“…The local resolution in diffraction can either be achieved by a combination of position sensitive detectors and high resolution collimators or by using focussed micro-or nanobeams through which the sample is scanned. The first approach has been realized at the DITO (DIffraction and TOmography) experiment [97] at the HARWI II beamline at DORIS III at DESY based on developments by Wroblewski et al [98] The alternative approach of combining diffraction and tomography, i.e. scanning the sample through a micro-or nano beam is only possible at third generation sources such as the ESRF (see e.g.…”

Section: Discussionmentioning

confidence: 99%

In‐Situ Synchrotron X‐Ray Microtomography Studies of Microstructure and Damage Evolution in Engineering Materials

Beckmann¹,

Grupp

Haibel

et al. 2007

Adv Eng Mater

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In materials science X‐ray microtomography has evolved as an increasingly utilized technique for characterizing the 3D microstructure of materials. The fundamentals of X‐ray microtomography experimental methods and the reconstruction and data evaluation processes are briefly described. A review of in‐situ synchrotron X‐ray microtomography studies in literature is given. Examples of recent work include in‐situ microtomography investiagtions of metallic foams, in‐situ studies of the sintering of copper particles, and in‐situ investigations of creep damage evolution in composites. Future perspectives of in‐situ X‐ray microtomography studies in materials science are outlined.

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Section: Discussionmentioning

confidence: 99%

In‐Situ Synchrotron X‐Ray Microtomography Studies of Microstructure and Damage Evolution in Engineering Materials

Beckmann¹,

Grupp

Haibel

et al. 2007

Adv Eng Mater

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“…[ 70 ] In addition to phase formation during solidification, XRD can be used to study phase formation due to certain processing steps and techniques, such as aging of the material [ 70 ] or explosive welding. [ 71 ] By assessing the lattice spacing shift, peak broadening, and changes in intensities, internal stresses and dislocations in the material due to processing, such as equal channel angular pressing (ECAP), [ 72 ] laser beam welding, [ 73 ] or friction stir welding, [ 74 ] can be determined. The stresses can be spatially resolved by adjusting the beam size and position.…”

Section: Alloy Developmentmentioning

confidence: 99%

Utilizing Synchrotron Radiation for the Characterization of Biodegradable Magnesium Alloys—From Alloy Development to the Application as Implant Material

et al. 2021

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Magnesium (Mg)-based alloys are investigated for the use as lightweight structural metals, e.g., in the automotive industry, [1] as biodegradable implant materials [2] and for hydrogen storage. [3] The choice of alloying system and subsequent processing of the material is a crucial factor for the degradation profile of the alloy and its mechanical properties. [4][5][6][7] This review focuses on use of Mg alloys as implant material, with some references to its application as a structural metal.The degradation profile of Mg alloys is of particular importance for their application as implant materials, as a controlled degradation is required to ensure cell viability and implant stability in vivo. [8,9] During the development of Mg alloys for the application as a biodegradable implant, alloying systems are carefully selected and manufactured, with their microstructure being tailored according to specifications by selecting the appropriate processing route. The microstructure and the mechanical properties of the alloy will be evaluated and the alloy is then tested for in vitro degradation in an aqueous environment under physiological conditions (pH %7.4, 37 C, 5% CO 2 , 21% O 2 , 95% rel. humidity) with and without cells to assess its general degradation properties and cell viability. [10] The mechanical properties and degradation profile need to be tailored depending on the application of the implant. Mg alloys for bone support, for example, require mechanical properties close to that of bone. For bone, the average Young's modulus is between 7 and 31 GPa, depending on the type of bone and its hydration state. [11,12] In longitudinal direction, the bone's tensile and compressive ultimate strength have been reported to be between 93 and 135 MPa, and 154 and 205 MPa, respectively. [13,14] Finally, the elongation to failure of the clinically approved MAGNEZIX screw by Syntellix AG (Hanover, Germany) was determined to be 8%. [15] By contrast, Mg alloys designed for the use as stents must possess a minimum ultimate tensile strength of 300 MPa, low yield strength of 200-300 MPa, and higher ductility (min. 15%-18% elongation to failure, preferably 30%) for their successful deployment. [16,17] Finally, in vivo animal experiments are conducted to evaluate the alloy suitability for the translation into the clinic.

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“…The general setup of the instrument has described in [3]. The experiment is typically operating in the photon energy range of 20 to 100 keV with beam diameters of up to 75 x 15 mm 2 allowing the investigation of metallic samples with several millimetres in diameter.…”

Section: Design Of the Experimentsmentioning

confidence: 99%

First Results of the DITO-Experiment at the HARWI II Beamline at GKSS/DESY

Hasse

Rahn

Odenbach

et al. 2008

MSF

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At the HARWI II beamline at the GKSS outstation at DESY a new experiment for position sensitive diffractometry and tomography called DITO was built and commissioned this year. Due to the available high energy synchrotron radiation with photon energies up to 100 keV it is possible to investigate the bulk of metallic samples of a few mm thickness with both methods. The diffractometry detector allows the investigation of the phase composition as well as phase sensitive determination of residual stresses with a spatial resolution of 6 μm while the tomography detector can either measure a whole tomogram in high resolution mode with a spatial resolution of 2 μm within 3 to 4 hours or in high speed mode recording a whole tomogram within 15 seconds with a spatial resolution of 40 μm.

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Determination of Residual Stress Fields with High Local Resolution

Cited by 4 publications

References 5 publications

In‐Situ Synchrotron X‐Ray Microtomography Studies of Microstructure and Damage Evolution in Engineering Materials

In‐Situ Synchrotron X‐Ray Microtomography Studies of Microstructure and Damage Evolution in Engineering Materials

Utilizing Synchrotron Radiation for the Characterization of Biodegradable Magnesium Alloys—From Alloy Development to the Application as Implant Material

First Results of the DITO-Experiment at the HARWI II Beamline at GKSS/DESY

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