3D mapping of dislocations-crack tip interaction in SrTiO3 with DFXM
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https://doi.esrf.fr/10.15151/ESRF-ES-2048667539
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资源简介：
Dislocations (line defects) in functional ceramics are generating rapid research interest for both functional and mechanical properties. Despite of recent years’ development for dislocation engineering into various oxides, a major challenge remains: crack initiation and propagation even in dislocation-rich regions can occur unexpectedly and lead to fracture of the samples. To overcome this challenge and better understand dislocation-crack tip interaction in oxides, here we propose to use SrTiO3 as a model system to use DFXM (dark-field X-ray microscopy) for imaging dislocations around cracks. DFXM will provide critical 3D information at micro/mesoscale with high resolution (~100 nm). Our preliminary DFXM test on SrTiO3 suggests this is a promising route. Samples with 4 different dislocation densities at pre-induced cracks will be probed. The spatial distribution of dislocations and their strain fields will be measured to feed our developed dislocation-based fracture mechanics model.
提供机构：
TU Darmstadt, Fachgebiet NAW, Fachbereich Materialwissenschaft Alarich-Weiss-Strasse 2, 64287, Darmstadt, DE; Karlsruhe Institute of Technology, Institute for Applied Materials, Kaiserstr. 12, 76131, Karlsruhe, DE
创建时间：
2028-01-01
