文档介绍：Analysis of EBSD Data (L17) 27-750, Fall 2009 Texture, Microstructure & Anisotropy, Fall 2009 B. El-Dasher * , . Rollett, . Rohrer , . Kalu Carnegie Mellon MRSEC Last revised : 7 th Nov. ‘ 09 * now with the Lawrence Livermore Natl. Lab. Overview ? Understanding the program: – Important menus – Definition of Grains in OIM – Partitioning datasets ? Cleaning up the data: – Types – Examples of Neighbor correlation ? Orientation: – System Definition – Distribution Functions (ODFs) – Plotting ODFs Overview ? Misorientation: – Definitions - Orientation vs. Misorientation – Distribution Functions (MDFs) – Plotting MDFs ? Other tools: – Plotting Distributions – Interactive tools Navigating the menus ? There are two menus that access virtually everything: Creates new partitions Imports data as partitions Access to routines that cleanup the dataset Use this to export text .ang files Check the scan stats Rotate the orientations of each point about sample frame Cut out scan sections Access to menu for: - Maps - Texture calculation - Texture plots Export grain ID data associated with each point Check the partition stats & definition Change the partition properties: - Decide which points to include - Define a “ grain ” Grain Definitions ? OIM defines a set of points to constitute a grain if: - A path exists between any two points (in the set) such that it does not traverse a misorientation angle more than a specified tolerance - The number of points is greater than a specified number Points with a CI less than specified are excluded from statistics Note: Points that are excluded are given a grain ID of 0 (zero) in exported files Grain Definitions Examples of definitions 3 degrees 15 degrees Note that each color represents 1 grain Partitioning Datasets - Choose which points to include in analysis by setting up selection formula Use to select by individual point attributes Use to select by grain attributes Selection f