Category Archive: Latest News

Mar 12

3D Visualization of Textures in Metals and Alloys

In a separate article, we described how one can use the neo-Eulerian orientation representations to create new 3D visualizations of the Rodrigues Fundamental Zones in homochoric, cubochoric, 3D stereographic, Euler and Rodrigues-Frank orientation representations. In the present article, we use these visualization modes to illustrate how one can represent Orientation Distribution Functions as 3D objects. …

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Feb 10

Electron Channeling Pattern Dictionary Indexing Manuscript

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One of our recent papers on dictionary indexing of electron channeling patterns (ECPs) was just accepted for publication in Microscopy & Microanalysis.  The original final submitted manuscript can be found HERE. The figure below represents one of the simulated ECPs from Fig. 5 of the manuscript; it is a false color version and will be …

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Oct 20

3D Visualization of neo-Eulerian and other rotation representations

3D visualization of rotations and crystallographic fundamental zones [This page provides Supplementary Material for the following paper: (DOI:10.1107/S1600576717001157) P. G. Callahan, M. Echlin, T. M. Pollock, S. Singh and M. De Graef, "Three-dimensional texture visualization approaches: theoretical analysis and examples", J. Appl. Cryst. (2017) 50.] 3D rotations are typically represented in terms of 3x3 rotation …

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Nov 12

New Release of EMsoft Package

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EMSoft 3.1 Release It is our pleasure to announce the release of the EMsoft 3.1 software package for the dynamical simulation of electron back-scattered diffraction patterns (EBSD), electron channeling patterns (ECP), and electron Kossel patterns (EKP), Dictionary Indexing for EBSD and ECP, along with a series of smaller support programs. This release once again focuses …

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Jul 01

Software for Time Interlaced Model Based Iterative Reconstruction (TIMBIR)

Summary The time-interlaced model-based iterative reconstruction (TIMBIR) [1,2] is a method for 4D time-space reconstruction of data acquired using synchrotron X-ray computed tomography. TIMBIR is a synergistic combination of two innovations. The first innovation, interlaced view sampling, is a novel method of data acquisition which distributes the view angles more evenly in time. The second …

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Jun 28

July 2015 CMU Workshop for 3D Microstructural Studies

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Download the workshop agenda and presentation slides from this page

Apr 17

Study mosaic of multi-variant martensites by Laue microdiffraction

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Introduction: The X-ray Laue diffraction is a general method to determine the periodicities of crystalline solids. When the ultra brilliant synchrotron X-ray source and the state-of-art X-ray optics are integrated to generate intense white-beam with submicron spatial resolution, it enables the Laue microdiffraction mode that scans and instantly collect the Laue diffraction pattern at the …

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Sep 12

Construction of a new 3D projection dome at CMU

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In the early Summer of 2014, we started the design of a 3D hemispherical projection dome for visualization of scientific data sets. Check this page to find out the status of this project.

Aug 25

Analysis and representation of microstructure data

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Recent improvements in experimental and computational techniques in material characterization have led to a vast amount of data on the microstructure and deformation of heterogeneous media. This information is traditionally arrayed in pixels, on grids. The massive extent of data in this form renders identifying key features difficult, and the cost of digital storage expensive. Our following research highlights introduce ways of efficient representation, construction, and analysis.

Aug 22

A new fortran-90 library for 3D rotation conversions

This page describes a fortran-90 module, rotations3D.f90, that provides functions, both in single and double precision, to convert between seven different rotation parameterizations. Fortran-90 source code implementing the 3D rotation conversion functions is available for download (zip file containing the 3Drotations module, along with an example program and associated input file).  3D rotations are frequently needed in a …

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Aug 18

Cubochoric coordinates: a new parameterization of 3D rotations

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The contents of this page were extracted from a manuscript in press in Modeling and Simulations in Materials Science and Engineering (MSMSE).  Contact M. De Graef for additional information.Fortran-90 source code that implements this rotation parameterization is available for download (zip file containing so3-sampler.f90; compiles with gfortran).  This program asks the user for a sampling rate and …

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