Paper Titles
Dislocation Densities, Slip-System Types and Burgers Vector Populationsinhexagonal and Cubiccrystalsfrom X-Ray Line Profile Analysis
p.479
Evaluation of Geometrically Necessary Dislocations Density (GNDD) near Phase Boundaries in Dual Phase Steels by Means of EBSD
p.485
Estimation of the Full Nye Tensor by EBSD-Based Dislocation Microscopy
p.489
Observations of Dislocation Structure in AA 7050 by EBSD
p.493
Investigation of Texture Gradients of Semi-Finished Products by Neutrons and Photons
p.499
Recent Advances in Texture Measurement Using Two-Dimensional Detector
p.507
In-Situ Texture Measurements by Synchrotron Radiation of TRIP Steel during an Austempering Treatment
p.511
Quantifying Damage Accumulation Using State-of-the-Art FFT Method
p.515
Generalized Pole Figures and Stored Energy Distribution Function Obtained by X-Ray Diffraction
p.519

Investigation of Texture Gradients of Semi-Finished Products by Neutrons and Photons

Article Preview

Abstract:

Texture gradients are present in most samples, which are due to materials processing. Standard methods to evaluate texture gradients are based on the cut of samples, such as the X-ray investigation of surface textures against the texture inside a sheet. Bulk textures itself averaging over the whole sheet thickness are analysed by thermal neutrons. Both thermal neutrons and photons with high energies allow investigations non-destructively. The beam port Stress-Spec at the Forschungs-Neutronenquelle Heinz Maier-Leibnitz (FRM II) at Garching/Germany is equipped with a robot system based on a RX160 Stäubli robot, a Laser Tracker and a heavy basement. Samples up to 30kg can be investigated. Main restrictions are the available neutron flux, the detector efficiency and the detector size. Thus, the gauge volume is restricted to 1x1x1mm for ideal scattering conditions to measure in acceptable time scale. Photons with up to 200keV are known as high brilliant and high intense beam with similar penetration power than thermal neutrons. A typical set up of a high energy beamline for texture gradient investigations works without an Eulerian cradle so that restrictions in handling large sample are of less importance. The HZG materials science beamlines at Doris III and Petra III (Harwi-II@DorisIII and HEMS@PetraIII) are equipped with massif units for sample rotation and x-, y- and z- scanning for samples and additional equipments up to 200kg. Compared to thermal neutrons, which work with wavelengths between 1Å-2.5Å, the wavelength of high energy photons is small (0.05Å – 0.20Å). That leads on one hand to low scattering angles (1° - 10°) and on the other hand to an anisotropic ellipsoidal gauge volume. The local resolution of the synchrotron beam is much better than for thermal neutrons. In both methods corrections for constant gauge volume during pole figure scanning and for anisotropic absorption are of great importance.

You might also be interested in these eBooks
Textures of Materials - ICOTOM 16 View Preview

Info:

Periodical:

Materials Science Forum (Volumes 702-703)

Pages:

499-506

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.702-703.499

Citation:

Cite this paper

Online since:

December 2011

Authors:

Heinz Guenter Brokmeier, Christian Randau, Wei Min Gan, Michael Hofmann, Thomas Lippmann, Norbert Schell

Keywords:

Neutron, Semi Finished Products, Synchrotron Radiation, Texture Gradient

Export:

RIS, BibTeX

Price:

Permissions CCC:

Request Permissions

Permissions PLS:

Request Permissions

Сopyright:

© 2012 Trans Tech Publications Ltd. All Rights Reserved

Share:

Citation:

References

[1] W.Reimers, A. Pyzalla, A. Schreyer, H. Clemens: Neutrons and Synchrotron Radiation in Engineering Materials Science (Wiley VCH, Weinheim, Germany 2008).

DOI: 10.1002/9783527621927

Google Scholar

[2] H.-G. Brokmeier: Physica B: Condensed Matter Vol. 385 (2006), p.623.

Google Scholar

[3] T. Lorentzen, M.T. Hutchings, P.J. Withers: Introduction to Characterization of Residual Stress by Neutron Diffraction (Taylor and Francis, London, 2005)

DOI: 10.1201/9780203402818

Google Scholar

[4] S. F. Nielsen, A. Wolf, H. F. Poulsen, M. Ohler, U. Lienert, R. A. Owen,: J. Synchrotron Rad. Vol. 7 (2000), p.103.

DOI: 10.1107/s0909049500000625

Google Scholar

[5] H.-G. Brokmeier, W. M. Gan, C. Randau, J. Rebelo-Kornmeier , M. Hofmann: Nuclear Instruments and Methods in Physics A: Vol. 642 (2011), p.87.

DOI: 10.1016/j.nima.2011.04.008

Google Scholar

[6] M. Hofmann, J. Robelo-Kornmeier, U. Garbe, R.C. Wimpory, J. Repper, G.A. Seidl, H.-G. Brokmeier, R. Schneider: Neutron News Vol. 18 (2007), p.27.

DOI: 10.1080/10448630701623285

Google Scholar

[7] C. Randau, U. Garbe, H.-G. Brokmeier: J. Appl. Cryst. Vol. 44, (2011), p.641.

Google Scholar

[8] H.J. Bunge, H. Klein: Z.Metallkunde Vol. 87 (1996), p.465.

Google Scholar

[9] H.-G. Brokmeier: Proc. ICOTOM12, edited by J. A. Szpunar, NRC Research Press, Ottawa, Canada 1999, p.86.

Google Scholar

[10] H.-G. Brokmeier, C. Randau, U. Garbe, P. Spalthoff, J. Bohlen: Proc. 8th Int. Conf. on Magnesium Alloys and their Applications, Wiley-VCH, Weinheim, Germany 2009, p.583.

Google Scholar

[11] A. King, M. Herbig, W. Ludwig, P. Reischig, E.M. Lauridsen, T. Marrow, J.Y. Buffière: Nuclear Instruments and Methods in Physics B: Vol. 268 (2010), p.291.

DOI: 10.1016/j.nimb.2009.07.020

Google Scholar

[12] J.F.H. Clusters: Philips Techn. Rundscahu Vol. 7 (1942), p.13

Google Scholar

[13] H.R. Wenk, Schweiz. Min. Petr. Mitt. (1966), p.518.

Google Scholar

[14] H.-G. Brokmeier, S.B. Yi, J. Homeyer, in: Microstructure and Texture in Steels, edited by A. Haldar, S. Suwas, D. Bhattacharjee, Springer Verlag, London, UK (2009) p.307.

Google Scholar

[15] H.-G. Brokmeier, A. Günther, S. Yi, W. Ye, T. Lippmann, U. Garbe: Advances in X-ray Analysis Vol. 46 (2003), p.151.

Google Scholar

[16] W. Skrotzki, N. Scheerbaun, C.-G. Oertel, H.-G. Brokmeier, S. Suwas, L.S. Toth: Acta Mater. Vol. 55 (2007), p.2211.

Google Scholar