Orientation relationship of Widmannstätten plates in an iron meteorite measured with high-energy synchrotron radiation

Abstract

The orientation distribution of the Widmannsta È tten plates was measured in a sample of the Gibeon iron±nickel meteorite. The measurements were made with high-energy synchrotron radiation at beamline BW5 at HASYLAB/DESY in Hamburg using a high-resolution`moving-detector' technique. The measurements reveal a continuous range of orientations stretching out from both sides of the Nishiyama±Wassermann orientation to the Kurdjumov±Sachs orientations, as well as a minor`spread-pipe' between the Kurdjumov±Sachs ends of neighbouring non-coplanar orientation variants.

Local electronic structure analysis using a photoelectron emission microscope (PEEM) with hard X-ray

“…However, in keeping with the terminology of materials science for describing certain crystallographic features, the Widmanstätten structure can be considered a mixed multi-crystal composed of bcc-FeNi and fcc-FeNi. The fine structure in the Widmanstätten structure is characterized by the acicular-shaped single crystal, or "lamella", that are several tenths of a μm in width [8]. This microstructure should show spatially different chemical compositions and lattice structures, and the size of this microstructure is comparable to the field of view of a PEEM analyzer; therefore, the iron meteorite is an appropriate specimen for the evolvement of NanoXAFS.…”

<i>In Situ</i> EBSD Analysis on the Crystal Orientation Relationship between Ferrite and Austenite during Reverse Transformation of an Fe-Mn-C Alloy

“…The K-S relationship and the Nishiyama relationship 26) are also shown in the same notation. Many of the α/γ interfaces have an orientation relationship quite close to the K-S relationship, that is, the orientation relationship with a misorientation of less than 2 in Δθ cpp and less than 2 in Δθ cpd is held at 16% of all the interfaces 19,27) . These orientation relationships are satis ed at Interface 1.…”

Evaluation of the Crystallographic Orientation Relationships between FCC and BCC Phases in TRIP Steels

“…Mostly, the Kurdjumov-Sachs and the Nishiyama-Wassermann relationships are used when the orientation relations between FCC and BCC phases are studied. Although there has been a lot of recent research [10][11][12][13][14][15][16][17][18][19] concerning which of these orientation relationships prevails, there is still considerable debate on the relative importance of these orientation relationships because the angular differences between the different orientation relationships is small which makes the experimental verification difficult. Recently, also other orientation relationships 5,6) were taken into account during the study of the crystallographic aspects of the FCC-BCC phase transformation.…”