A zonal dislocation mechanism for rhombohedral twinning in sapphire (α-Al2O3)
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Atomic-scale mechanism of rhombohedral twinning in sapphire
2021, Acta MaterialiaNanoindentation deformation and cracking in sapphire
2019, Ceramics InternationalCitation Excerpt :However, fracture and twinning as two main mechanism of deformation in sapphire at room temperature have been observed in nanoindentation experiments. The principal twinning systems observed in sapphire are basal (C) and rhombohedral (R) twinning [10,13]. Therefore, studying the mechanical anisotropy of sapphire is crucial for improving its processing parameters; in other words, understanding the effects of crystal structure on the deformation and crack propagation of sapphire is essential for the successful application of this material.
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2017, Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and AtomsFast hydrogen diffusion along the Σ7 grain boundary of α-Al<inf>2</inf>O<inf>3</inf>: A first-principles study
2016, International Journal of Hydrogen EnergyPlasticity and fracture of sapphire at room temperature: Load-controlled microcompression of four different orientations
2014, Ceramics InternationalCitation Excerpt :The deformation mechanisms in sapphire have been traditionally difficult to examine due to its relatively high strength and its brittle nature. The advent of micro-mechanical testing over the last two decades, such as nanoindentation experiments [10,16], have helped to alleviate this problem since a lower load is required to deform the micron-sized volumes in these tests. Micro-pillar compression tests are particularly advantageous in this respect since they can be used to induce a brittle-to-ductile transition in the material response by controlling the volume of the interrogated material [23–31].