<i>In situ</i> fracture observations of distinct interface types within a fully lamellar intermetallic TiAl alloy

Burtscher, Michael; Alfreider, Markus; Schmuck, Klemens; Clemens, Helmut; Mayer, Svea; Kiener, Daniel

doi:10.1557/jmr.2020.306

Cited by 1 publication

(1 citation statement)

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“…For these frames manual evaluation was also challenging and showed low reproducibility due to semi-brittle fracture behavior and the low contrast in the crack tip vicinity. However, image-based crack detection is much simpler for consistently brittle fracture behaviour, such as the fracture of fully lamellar intermetallic TiAl alloys, to which the algorithm was already successfully applied [26].…”

Section: Discussionmentioning

confidence: 99%

Crack length estimations for small-scale fracture experiments via image processing techniques

Schmuck

Alfreider

Kiener

2022

Journal of Materials Research

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Accurate knowledge of the current crack length is crucial to evaluate fracture mechanical tests. At the sub-micron to micron scale, the crack length is directly accessible via observation during in-situ experiments in electron microscopes, or indirectly via calculation from sample stiffness. In the current work, image processing techniques were used to introduce a semi-automatic technique to measure crack lengths at the micron scale from image sequences. The technique utilizes manually defined filters and searches for contours near the previous crack tip locating the new one according to the previous position. To demonstrate validity and capability, three micron-sized notched cantilevers were prepared for bending experiments and tested in-situ by partial unloading. Comparison of crack lengths determined by the proposed method, manual measurement and sample stiffness revealed a reasonable agreement, while occasional deviations allow further insights into the crack behaviour. Thus, our new approach enables more in-depth investigation of small-scale fracture processes. Graphical abstract

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Section: Discussionmentioning

confidence: 99%