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Irrational orientation relationship derived from rational orientation relationships using EBSD data
Author(s) -
Nolze G.
Publication year - 2008
Publication title -
crystal research and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.377
H-Index - 64
eISSN - 1521-4079
pISSN - 0232-1300
DOI - 10.1002/crat.200711058
Subject(s) - misorientation , electron backscatter diffraction , orientation (vector space) , pole figure , materials science , phase (matter) , irrational number , transformation (genetics) , boundary (topology) , representation (politics) , diffraction , geometry , condensed matter physics , crystallography , optics , mathematics , mathematical analysis , physics , chemistry , microstructure , metallurgy , gene , biochemistry , quantum mechanics , politics , political science , law , grain boundary
The determination of the orientation relationship (OR) between α ‐Fe matrix (bcc) and γ ‐Fe precipitates (fcc) is discussed using orientation data collected by electron backscatter diffraction (EBSD). The comparatively low accuracy of EBSD is compensated by the high number of measurements what allows a general statement regarding to the mean OR existing in a sample. The representation and discussion is realized on a part of the Bain zone in a {001} pole figure. A discussion of some selected rational OR which are commonly used for the phase boundary characterization between α and γ shows that the pole figures describing a transformation from γ → α are different to those for α → γ . A technique is proposed based on at least three misorientation angles between the experimental OR to the rational OR's as reference. For the misorientation angle distribution a refinement is applied to extract the mean values. They are used to detect the mean OR, what is also possible for only a few or even a single precipitate if the number of measurements describing the phase boundary is sufficiently high. (© 2007 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)