| About this Abstract |
| Meeting |
MS&T21: Materials Science & Technology
|
| Symposium
|
Processing—Microstructure—Property Relationships of Titanium and Titanium Alloys
|
| Presentation Title |
Computational Polarized-Light Microscopy for Microtextured Regions Characterization in Titanium Alloys |
| Author(s) |
Matthew Dahar, Sesh Tamirisakandala, Dan Satko, Ayman Salem |
| On-Site Speaker (Planned) |
Matthew Dahar |
| Abstract Scope |
Microtextured regions (MTRs) are spatially and crystallographically clustered alpha grains that cause significant debits in fatigue life under cold dwell loading conditions such as those experienced during operation of jet engines. Large-area electron backscatter diffraction (EBSD) is the primary tool to characterize MTRs (size, shape, and crystallographic orientation) but limitations due to sample prep, size, cost, and time restrict implementation. An alternative method for MTRs quantification is based on orientation reconstruction from computational polarized-light microscopy (CPM) data. Using a polarized-light instrument developed by MRL (TiPolarTM), data were recorded at an effective 200,000 pixel per second at 0.4 micrometer resolution (1000x faster than EBSD) without the attendant size and atmosphere limitations typical of EBSD. Data analytics were applied to determine c-axis orientation. Examples of application of CPM to different titanium alloys will be presented to demonstrate the capabilities and robustness of the method with comparisons to EBSD measurements. |