popLA Manual (PDF) - Materials Science and Engineering

DETAILS
This section will detail page by page the menus used in popLA. Activate popLA by typing
popla
from anywhere. For the scientific background behind popLA refer to the paper entitled “Operational Texture
Analysis” by J. S. Kallend, U. F. Kocks, A. D. Rollett and H.–R. Wenk published in Materials Science and
Engineering, A132 (1991) pages 1-11. A corrected reprint is available and included with the package.
MAIN MENU (page 1)
You must return here to go from one page to another.
popLA: preferred orientation package - Los Alamos (Page 1)
J.S. Kallend, U.F. Kocks, A.D. Rollett, and H.R. Wenk (October 1993)
0. QUIT
1. Get specimen DIRECTORY and VIEW a file
2. MASSAGE data files: correct, rotate, tilt, symmetrize, smooth, compare
3. WIMV: make spec.SOD; calculate PFs and inverse PFs; make matrices
4. HARMONIC analysis: COMPLETE rim (.FUL), get Roe Coeff.file (.HCF)
5. CONVERSIONS, permutations, transformations, paring
6. DISPLAYS and plots
7. Derive PROPERTIES from .SOD or .HCF files, make WEIGHTS file for simul.
8. DOS (temporary, type EXIT to return)
Please enter a number from 0 to 8 -->
#0 Quit
This exits popLA and returns control to the DOS command shell.
#1 Directory
This option is to look at the contents of a data file within popLA. It displays all files name specname.* in the
current directory and prompts
Enter filename:
The data file selected is passed to a program called LIST. LIST has many commands useful for looking through
ASCII files. Type “P” to print what is displayed. It will continue printing upon Page Down – until “P” is
toggled again. Type “X” to quit LIST and return to popLA.
LIST is a shareware product with a $15 registration fee
LIST Copyright 1986 by Vernon D. Buerg
456 Lakeshire, Daly City CA 94015
#2 Massage Data Files
This option displays the Massage Data Files menu. This section of popLA is used for correcting raw data file
obtained from X-Ray analysis for various effects and rotating the resulting pole figures so that the intrinsic
sample symmetry is apparent.
#3 WIMV Analysis
WIMV analysis is the best method in popLA for determining orientation distributions. It is named for the
authors of the algorithm—Williams, Imhof, Matthies, and Vinel. A short introduction to WIMV is given in a
text by Wenk (1985) and a more detailed description in one by Matthies (1982).
#4 Harmonic Analysis
Another method of determining orientation distributions is harmonic analysis. An analytical solution to the
orientation distribution function (ODF) is known for a special harmonic function. The coefficients of this
function can be determined from the experimental data through an iterative process, allowing the ODF to be
determined. The present harmonic analysis uses only the even (symmetrical) part of the ODF, which can lead to
some errors in determining the true ODF.
It is often useful to use harmonic analysis on a group of pole figures to extrapolate the pole figures to the very
high tilt angles which cannot be measured experimentally, especially when there is significant intensity at the
edge of the pole figure. After extrapolation the pole figure is re-normalized, giving more accurate intensities in
the interior region, which can then be analyzed using WIMV.
DETAILS 22