Multiple wavelengths texture measurement using angle dispersive neutron diffraction at wombat

Pingguang Xu, Klaus Dieter Liss*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

In contrast to conventional angle dispersive neutron diffractometers with a single-tube detector or a small-size linear position-sensitive detector, the WOMBAT diffractometer of the Australian Nuclear Science and Technology Organisation (ANSTO) is equipped with a large-area curved position-sensitive detector, spanning 120 for the scattering angle 2θ and 15 for the azimuth η, respectively. Here, WOMBAT was employed in establishing a texture measurement environment for complex textured samples, through measuring neutron diffractograms at two selected wavelengths on a typical reference sample of martensite–austenite multilayered steel sheet. All neutron patterns were simultaneously Rietveld analyzed using the software, Materials Analysis Using Diffraction (MAUD). The shorter wavelength (λ1 = 1.54 Å, k1 = 4.08 Å−1) enabled collecting the martensite reflections α-110, α-200, α-211, α-220, α-310, and α-222, as well as the austenite peaks γ-111, γ-200, γ-220, γ-311, γ-222, and γ-331 simultaneously, by pre-setting the detector range to 2Θ = 30~150. The longer wavelength (λ2 = 2.41 Å, k2 = 2.61 Å−1) enabled separating the overlapping strong martensite α-110 and austenite γ-111 Laue–Bragg interferences more reliably. Moreover, the detector panel division along the vertical direction has a good stereographic coverage in the azimuthal angle η,. Such a combination of multiple-wavelength neutron diffraction combined with simultaneous Rietveld texture analysis was confirmed as being very valuable for realizing high precision measurements for complex textured samples at an orientation distribution graticule of 5, and in a much shorter beam time than the conventional angle dispersive method.

Original languageEnglish
Article number11
JournalQuantum Beam Science
Volume5
Issue number2
DOIs
StatePublished - Jun 2021

Keywords

  • Austenite
  • Detector panel division
  • Ferrite
  • Metallic materials
  • Multilayered steel
  • Neutron diffraction
  • Reliability
  • Rietveld texture analysis
  • Texture measurement

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