|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||In Operando Nano- and Micro-mechanical Characterization of Materials with Special Emphasis on In Situ Techniques
||Towards Nanoscale In-situ Fatigue and Fracture Experiments in the TEM
||Peter J Imrich, Daniel Kiener
|On-Site Speaker (Planned)
The TEM offers unprecedented opportunities to unravel the processes governing plasticity deformation at a nanoscale. In particular, by the wide availability of quantitative in-situ testing possibilities, significant contributions regarding the understanding of size effects governing the static uniaxial strengthening mechanisms in sub-micron dimensions were contributed.
Here, we aim to advance from static to cyclic testing and focus on understanding the cyclic deformation mechanisms and damage accumulation at the nanometer scale. Therefore, we performed quantitative cyclic bending experiments on miniaturized samples in-situ in the TEM using a Hysitron PI-95. As stresses in bending are highest on the surface, samples were annealed in-situ before testing to remove influences from the FIB fabrication. We find that the nucleation of partial or perfect dislocations and their pile-up at the neutral axis govern the cyclic deformation, and damage accumulation occurs based on dislocation interaction. Moreover, we present recent insights into fracture behavior using in-situ TEM.
||Planned: A print-only volume