Internal Strains Of A Creep Deformed Single Crystal Nickel-Based Superalloy

ABSTRACTNeutron scattering experiments have been carried out with undeformed and creep deformed samples of the superalloy CMSX-4. From the measured constrained misfit data, obtained from different reflecting planes with respect to the external load axis, two strain tensors for horizontal and vertical matrix plates can be extracted.A careful data analysis is necessary since the technical manufactured single crystals show a mosaic spreading of 0.5° and the wavelength spreading of the incident neutron beam, Δλ/λ is about 410-3 This is in the same range as the unknown constrained misfit quantities δc. A method has been developed which allows a calculated intensity distribution to be fitted to the measured one.

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Hydrogen Effects in Nickel Based Superalloy Single Crystals

Chemistry and Physics of Fracture ◽

10.1007/978-94-009-3665-2_31 ◽

1987 ◽

pp. 560-567

Author(s):

J. Chene ◽

I. M. Bernstein

Keyword(s):

Single Crystals ◽

Nickel Based Superalloy

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Electron diffraction from crystal defects: Fraunhofer effects from plane faults

Proceedings of the Royal Society of London Series A - Mathematical and Physical Sciences ◽

10.1098/rspa.1966.0165 ◽

1966 ◽

Vol 293 (1433) ◽

pp. 169-180 ◽

Cited By ~ 11

Keyword(s):

Electron Diffraction ◽

Intensity Distribution ◽

Stacking Faults ◽

Dynamical Theory ◽

Crystal Defects ◽

Similar Calculation ◽

Selected Area Electron Diffraction ◽

Periodic Intensity ◽

Diffraction Patterns ◽

Calculated Intensity

The selected area electron diffraction patterns from a crystal containing a stacking fault have been observed to exhibit a number of unusual features. In some cases a periodic intensity distribution about the Bragg spot, in other cases streaking. By applying Kirchhoff’s theory of diffraction and using the dynamical theory of electron diffraction this intensity distribution around the Bragg spots in the electron diffraction patterns from stacking faults has been calculated. The calculated intensity distributions compare favourably with experiment. A similar calculation has also been carried out to predict the intensity distribution around Bragg spots in the selected area electron diffraction patterns from a crystal containing a grain boundary.

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Monte Carlo simulation of a reactor-based neutron strain scanning diffractometer

Journal of Applied Crystallography ◽

10.1107/s0021889801009190 ◽

2001 ◽

Vol 34 (5) ◽

pp. 613-624 ◽

Cited By ~ 3

Author(s):

C. R. Borlado ◽

F. J. Mompean ◽

Ru Lin Peng

Keyword(s):

Monte Carlo Simulation ◽

Monte Carlo ◽

Neutron Beam ◽

Beam Divergence ◽

Incident Neutron ◽

Monte Carlo Code ◽

Instrumental Resolution ◽

Simulation Results ◽

Wavelength Distribution ◽

Incident Neutron Beam

A Monte Carlo code for the simulation of neutron strain scanning experiments on a reactor-based two-axis diffractometer is described. In order to validate this code, several experiments have been performed. A comparison is made between experimental and simulated results for instrumental resolution, primary beam divergence and wavelength distribution in the incident neutron beam. Finally, the application of the simulation results to the analysis of a real neutron strain scanning experiment is outlined.

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THE SPECTRUM OF NEUTRONS FROM THE IRRADIATION OF URANIUM BY 14-MEV NEUTRONS

Canadian Journal of Physics ◽

10.1139/p61-105 ◽

1961 ◽

Vol 39 (7) ◽

pp. 957-966 ◽

Cited By ~ 7

Author(s):

R. L. Clarke

Keyword(s):

Inelastic Scattering ◽

Cross Section ◽

Neutron Beam ◽

Strong Evidence ◽

Direct Interaction ◽

Natural Uranium ◽

Incident Neutron ◽

Absolute Yield ◽

Time Of Flight Method ◽

Incident Neutron Beam

The spectrum and absolute yield of neutrons resulting from 14-Mev neutrons incident on natural uranium was observed at 90°± 16 to the incident neutron beam by a time-of-flight method. Further observations of the spectrum from 9 to 13.5 Mev were made for scattering angles at 30° and 60°. In addition to the expected neutrons resulting from evaporation and fission, strong evidence is seen for direct interaction inelastic scattering. The (n,n′) cross section is estimated to be 150 ± 70 millibarns.

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Measurements of dynamic Young's modulus and damping in single crystals of a nickel-based superalloy as a function of temperature

Journal of Materials Science Letters ◽

10.1007/bf00420543 ◽

1993 ◽

Vol 12 (14) ◽

pp. 1128-1130 ◽

Cited By ~ 2

Author(s):

A. Wolfenden ◽

M. D. Compere ◽

B. Decamps

Keyword(s):

Single Crystals ◽

Young’S Modulus ◽

Young's Modulus ◽

Nickel Based Superalloy ◽

Dynamic Young’S Modulus ◽

Dynamic Young's Modulus

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Detailed characterisation of the incident neutron beam on the TOSCA spectrometer

Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment ◽

10.1016/j.nima.2017.07.018 ◽

2017 ◽

Vol 870 ◽

pp. 79-83 ◽

Cited By ~ 13

Author(s):

Roberto S. Pinna ◽

Svemir Rudić ◽

Matthew J. Capstick ◽

David J. McPhail ◽

Daniel E. Pooley ◽

...

Keyword(s):

Neutron Beam ◽

Incident Neutron ◽

Incident Neutron Beam

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Intensity and resolution effects in converging multichannel collimators for SANS by Monte Carlo simulation

Journal of Applied Crystallography ◽

10.1107/s0021889803014948 ◽

2003 ◽

Vol 36 (5) ◽

pp. 1262-1265 ◽

Cited By ~ 2

Author(s):

A. N. Falcão ◽

F. M. A. Margaça ◽

F. G. Carvalho

Keyword(s):

Computer Simulation ◽

Monte Carlo Simulation ◽

Monte Carlo ◽

Neutron Beam ◽

Incident Neutron ◽

Beam Direction ◽

Channel Axis ◽

Monte Carlo Computer Simulation ◽

The Individual ◽

Incident Neutron Beam

A study of the contribution of the individual channels of a converging multichannel collimator to the operation of the device is carried out by means of a Monte Carlo computer simulation. The simulation shows that the coupling between the divergence of the incident neutron beam and the inclination of the individual CMC channel axis relative to the beam direction modulates the channel performance as far as intensity and resolution of the transmitted neutrons are concerned. While this does not impair in any significant way the usefulness of the device, the results are helpful to the designer.

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Magnetization curves for ferromagnetic single crystals

Proceedings of the Royal Society of London Series A - Mathematical and Physical Sciences ◽

10.1098/rspa.1948.0034 ◽

1948 ◽

Vol 193 (1032) ◽

pp. 72-88 ◽

Cited By ~ 59

Keyword(s):

Single Crystals ◽

Applied Field ◽

Oblate Spheroid ◽

Domain Theory ◽

Magnetization Curves ◽

Demagnetizing Field ◽

Long Rod ◽

Ferromagnetic Single Crystals ◽

Internal Strains ◽

Good Agreement

Magnetization curves for iron single crystals above the ‘knee’ are derived on the basis of domain theory for the case where the specimen is finite and the field is applied in an arbitrary direction with respect to the crystal axes. The shape of the specimen is important for the magnetization process and it is shown that in many cases the demagnetizing field must be such as to make the field actually acting in the crystal have a direction of symmetry (e. g. [111] or [110]) whatever the direction of the applied field. The cases of an oblate spheroid with its equatorial plane a (100) plane of the crystal and of a long rod with arbitrary orientation are considered in detail. In these cases simple expressions for the magnetization curves are obtained. There is good agreement with the experimental results of various authors for both parallel and normal components of magnetization. A method for correcting for the effect of internal strains is indicated.

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