Overall Project Description:
Data for In Situ TEM Mechanical Testing in Irradiated Oxide Dispersion Strengthened Alloys - v1.0. This is a dataset comprised of videos and raw load-displacement text files of experiments run to demonstrate the use of in situ TEM mechanical testing to find meaningful mechanical properties of as received, self-ion, and proton irradiated Fe-9%Cr ODS. The desire to work at small scale in characterization of irradiated materials to reduce costs and improve throughput, require the development of novel methods to assess mechanical properties in volume-limited irradiation damage layers.
In this work micropillar compression (archived separately), cantilever bending, lamellae indentation, and clamped beam fracture testing is conducted on ion-irradiated Fe-9%Cr ODS to find yield stress, elastic modulus, flow stress, and fracture toughness. Micropillars in compression allow us to define a minimum sample dimension, which approaches the obstacle spacing of the material, at which size effects are observed. This relationship between sample dimension and obstacle spacing defined through micropillar compression is extended to a new testing geometry, cantilever bending, and material property, flow stress. Lessons learned during the cantilever bending informed the clamped beam design for conducting fracture testing on a ductile engineering alloy at micrometer scales. Finally, lamellae indentation was conducted to link qualitative observations of the microstructure under load with literature strength of obstacle values. By combining an understanding of the microstructure of irradiated Fe-9%Cr ODS and the in situ TEM technique, one can find the bulk-like mechanical properties of ion irradiated Fe-9%Cr ODS.
Video files for original bright field transmission electron microscopy in situ indentation of two lamellae and corresponding video
files of the MicroViBe treated versions. These videos demonstrate the use of lamellae indentation for qualitative analysis and the use of the MicroViBe algorithm to better visualize and understand obstacles in Fe-9%Cr ODS. In the MicroViBe algorithm, changes in pixel value are identified and then summed over each frame of the video. This results in a "heatmap" where red areas have the most number of pixel value changes and dark blue areas have zero pixel value changes.
These videos were collected for and analyzed in the following publication:
K.H. Yano, S. Thomas, M.J. Swenson, Y. Lu, and J.P. Wharry. TEM in situ cube-corner indentation analysis using ViBe motion detection algorithm. Journal of Nuclear Materials 502 (2018) 201-212. doi:10.1016/j.jnucmat.2018.02.003
They are also part of the dissertation:
Yano, Kayla H., In Situ TEM Mechanical Testing of Irradiated Oxide Dispersion Strengthened Alloys. Purdue University, 2019.
Cite this work
Researchers should cite this work as follows:
- Yano, K. H., Swenson, M., Thomas, S., Lu, Y., Wharry, J. P. (2019). In situ TEM lamellae indentation of Fe-9%Cr ODS videos and corresponding MicroViBe videos. Purdue University Research Repository. doi:10.4231/NGCG-PG03