September 15th Coding Work

In my previous posts, I mentioned the need to capture the boundaries between the recrystallized and deformed grains. Partitioning by the OIM Data Analysis software by TSL/EDAX is limiting because the only boundaries that are exported are those between the recrystallized grains. Therefore there is a significantly loss of information on all the edges bordering the deformed regions. This cause the Sigma3 content in this region to become extremely saturated due to the exclusion of the high angle boundaries with the deformed regions, as well as limit the ability to analyze misorientations at the border between deformed and recrystallized grains.

I've written a simple C++ code in the past that basically picks the reconstructed boundaries of interest simply based on GrainIDs. This was easy to achieve in the EBSD scan I was working with since I was just looking at boundaries around two abnormal grains (see the picture below). The program went through and selected all reconstructed boundaries that contained one of the abnormal grains.

Abnormal grain growth observed in electrodeposited nanocrystalline nickel annealed for 2 hours at 500C.

We can use the grain orientation spread (GOS) criterion to select for the grains of interest. The issue is that the reconstructed boundaries text file only contains GrainIDs (and this cannot be changed). We can however export a Grain File (.txt) out that contains the GrainIDs and their average GOS. The proposal (and currently being worked on) is to first analyze the Grain File for all grains of interest based on their GOS, and store the GrainIDs of all grains of interest.

Using this list, we can select for all reconstructed boundaries containing on of these grains. This works much better than before because we still get all boundaries between recrystallized grains, but also the boundaries between recrystallized and deformed grains, and thirdly, none of the boundaries between neighboring deformed grains (which would contribute to a larger fraction of random boundaries).

Off to more work now...