Upgrading of the PETRA-2 beamline at HASYLAB for materials science analyses

Kampmann, R.; Lippmann, Thomas; Burmester, J.; Santos, J.F. dos; Franz, H.; Haese, Martin; Marmotti, M.

doi:10.1016/s0168-9002(01)00652-0

Cited by 8 publications

(6 citation statements)

References 4 publications

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“…Three other samples were investigated on the beamline PETRA II at HASYLAB, Hamburg, Germany [22], with a similar experimental arrangement, since the two beamlines share the same general layout. Those samples were pre-aged at 1270 K for 25h and 100h and at 1120 K for 150h (and quenched to freeze their microstructure).…”

Section: Methodsmentioning

confidence: 99%

The Kinetics of the γ' Phase and Its Strain in the Nickel Base Superalloy SC16 Studied by In-Situ Neutron and Synchrotron Radiation Diffraction

Bruno¹,

Pinto²

2004

Superalloys 2004 (Tenth International Symposium)

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In-situ studies of the kinetics of the nucleation and growth of the ' phase, as well as of the phase strains in the single crystal Nibase superalloy SC16 were carried out by means of neutron and high-energy synchrotron radiation diffraction. The investigations were aimed at a better understanding of the fundamental kinetic phenomena, in view of the optimization of the heat treatments applied prior to the industrial use of the alloy, and at monitoring the evolution/relaxation of the interphase strains during the microstructural changes. Measuring superlattice reflections allows the different stages of decomposition, nucleation, growth and concurrent coarsening to be followed by in-situ neutron diffraction. Results show that at temperatures T 1490 K (a critical undercooling of about 30 K is found) an increasing volume fraction of ' can be found with decreasing temperature, until a saturation at around 1100 K occurs. Following classical kinetics theory, an Avrami-like growth (time) law was used to model the volume fraction time behaviour.The total reaction rate W shows a maximum at around 1300 K, where the competing nucleation and growth processes find equilibrium. The reaction rate first increases with the undercooling T and then decreases. This implies a change in the character of the reaction, which was found to be initially surface and then bulk driven. Unlike the integrated intensity, the lattice mismatch follows a pure exponential time decay, having bigger decay times at higher temperatures. This implies that the particles are born fully coherent, and then coherency strains set up. As the time goes by, long term ageing shows a stabilisation of the misfit value, while the precipitates are supposed to loose their coherency to the matrix (already within 3-4 h), and the strains relax. The strain relaxation rate has its maximum around 1420 K.

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Section: Methodsmentioning

confidence: 99%

The Kinetics of the γ' Phase and Its Strain in the Nickel Base Superalloy SC16 Studied by In-Situ Neutron and Synchrotron Radiation Diffraction

Bruno¹,

Pinto²

2004

Superalloys 2004 (Tenth International Symposium)

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“…By putting a similar camera in the far field it becomes possible to record a high-resolution image of the diffraction spot (Kampmann et al, 2001;Bö hm et al, 2003) and to resolve the angular difference between the and 0 peaks (Fig. 6).…”

Section: Dcdmentioning

confidence: 99%

“…By putting a camera in the far field, following a diffraction spot with high angular accuracy and in real time becomes possible (Kampmann et al, 2001;Bö hm et al, 2003). The aim of this paper is to describe this double-crystal diffractometry (DCD) setup and to give some preliminary results on hightemperature creep tests with fast transients on a model material: AM1 Ni-base single-crystal superalloy (Caron & Lavigne, 2011).…”

Section: Introductionmentioning

confidence: 99%

Real-time study of transients during high-temperature creep of an Ni-base superalloy by far-field high-energy synchrotron X-ray diffraction

et al. 2018

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The high-temperature mechanical behavior of single-crystal Ni-base superalloys has been formerly studied by in situ triple-crystal synchrotron X-ray diffractometry (TCD). However, the 1/300 s recording frequency does not allow real-time tests. It is shown here that real-time monitoring is possible with far-field diffractometry in transmission. The use of a far-field camera enables one to follow a diffraction spot with high angular precision and high recording speed. This technique allows measurement of the mechanical response of an AM1 Nibase single-crystal superalloy following steep load jumps and relaxations during high-temperature creep tests. Local crystal misorientation is revealed and rafting (oriented coalescence) is examined. This new technique is compared with TCD, in order to highlight its benefits and drawbacks.

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“…Alternatively, ring sections can be recorded more accurately by putting larger area detectors further away. Such a configuration has been established by using wire-frame gas detectors at the PETRA-II beamline at HASYLAB (Kampmann et al, 2001). of the angles (, , !) into a pole figure (, ) can be found in the literature (Bunge and Klein, 1996).…”

Section: Texture and Stress Analysismentioning

confidence: 99%

“…In particular two detectors can be used in order to still acquire two dimensions of the strain field. However, in a greater distance the requests regarding spatial resolution of the detectors is relaxed and position sensitive gas detectors as developed by DENEX 2 can be employed (Kampmann et al, 2001;Marmotti et al, 2002). Those detectors are not isotropic and the position resolving wires are oriented radially to the Debye-Scherrer ring in order to receive a resolution of about 1 mm.…”

Section: Texture and Stress Analysismentioning

confidence: 99%

High‐Energy X‐Rays: A tool for Advanced Bulk Investigations in Materials Science and Physics

Liss

Bartels

Schreyer³

et al. 2003

Texture, Stress, and Microstructure

187

132

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High-energy X-rays between 30 keV and 1 MeV, such as provided by modern synchrotron radiation sources as the ESRF and HASYLAB, bear the advantage of high penetration into most materials. Even heavy element compositions can be accessed in their volume. The range of applications is huge and spreads from nuclear spectroscopy to the characterization of metal extrusion under industrial conditions. This article compiles an overview over the most common instrumental diffraction techniques.Modern two-dimensional detectors are used to obtain rapid overviews in reciprocal space. For example, diffuse scattering investigations benefit from the very flat Ewald sphere as compared to low energies, which allow mapping of several Brillouin zones within one single shot. Diffraction profiles from liquids or amorphous materials can be recorded easily. For materials science purposes, whole sets of Debye-Scherrer rings are registered onto the detector, their diameters and eccentricities or their intensity distribution along the rings relating to anisotropic strain or texture measurements, respectively. At this point we stress the resolution of this technique which has to be carefully taken into account when working on a second generation synchrotron source.Energy-dispersive studies of local residual strain can be studied by a dedicated three-circle diffractometer which allows accurately to adjust the scattering angle from a defined gauge volume.Triple axis diffractometry and reciprocal space mapping is introduced and can be employed for highest resolution purposes on single crystal characterization, even under heavy and dense sample environments. Thus, the perfection of single crystals can be mapped and strain fields and superstructures as introduced by the modulation from ultrasonic waves into crystals or epitaxially grown Si/Ge layers can be investigated in detail. Phase transitions as magnetic ordering can be studied directly or through its coupling to the crystal lattice. Time resolved studies are performed stroboscopically from a sub-nanosecond to a second time scale.The combination of these techniques is a strong issue for the construction and development of future instruments.

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Upgrading of the PETRA-2 beamline at HASYLAB for materials science analyses

Cited by 8 publications

References 4 publications

The Kinetics of the γ' Phase and Its Strain in the Nickel Base Superalloy SC16 Studied by In-Situ Neutron and Synchrotron Radiation Diffraction

The Kinetics of the γ' Phase and Its Strain in the Nickel Base Superalloy SC16 Studied by In-Situ Neutron and Synchrotron Radiation Diffraction

Real-time study of transients during high-temperature creep of an Ni-base superalloy by far-field high-energy synchrotron X-ray diffraction

High‐Energy X‐Rays: A tool for Advanced Bulk Investigations in Materials Science and Physics

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Upgrading of the PETRA-2 beamline at HASYLAB for materials science analyses

Cited by 8 publications

References 4 publications

The Kinetics of the &#947;' Phase and Its Strain in the Nickel Base Superalloy SC16 Studied by In-Situ Neutron and Synchrotron Radiation Diffraction

The Kinetics of the &#947;' Phase and Its Strain in the Nickel Base Superalloy SC16 Studied by In-Situ Neutron and Synchrotron Radiation Diffraction

Real-time study of transients during high-temperature creep of an Ni-base superalloy by far-field high-energy synchrotron X-ray diffraction

High‐Energy X‐Rays: A tool for Advanced Bulk Investigations in Materials Science and Physics

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Product

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The Kinetics of the γ' Phase and Its Strain in the Nickel Base Superalloy SC16 Studied by In-Situ Neutron and Synchrotron Radiation Diffraction

The Kinetics of the γ' Phase and Its Strain in the Nickel Base Superalloy SC16 Studied by In-Situ Neutron and Synchrotron Radiation Diffraction