investigations of cracks propagating at up to 2.5 km s along an (001) plane of a silicon single crystal are reported, using X-ray diffraction megahertz imaging with intense and time-structured synchrotron radiation. The studied system is based on the Smart Cut process, where a buried layer in a material (typically Si) is weakened by microcracks and then used to drive a macroscopic crack (10 m) in a plane parallel to the surface with minimal deviation (10 m). A direct confirmation that the shape of the crack front is not affected by the distribution of the microcracks is provided. Instantaneous crack velocities over the centimetre-wide field of view were measured and showed an effect of local heating by the X-ray beam. The post-crack movements of the separated wafer parts could also be observed and explained using pneumatics and elasticity. A comprehensive view of controlled fracture propagation in a crystalline material is provided, paving the way for the measurement of ultra-fast strain field propagation.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC9348878 | PMC |
| http://dx.doi.org/10.1107/S1600576722006537 | DOI Listing |
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