Microstructural Properties and Pressure Distribution in Ultra-Short-Pulse Welds of Sapphire to Iron.
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| Title: | Microstructural Properties and Pressure Distribution in Ultra-Short-Pulse Welds of Sapphire to Iron. |
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| Authors: | Günther, Lukas1,2 (AUTHOR), Friedrich, Anne2,3 (AUTHOR), Thomas, Jens Ulrich2,3 (AUTHOR), Müller, Thomas4 (AUTHOR), de Ligny, Dominique1 (AUTHOR) |
| Source: | Nanomaterials (2079-4991). Jun2026, Vol. 16 Issue 12, p737. 10p. |
| Subjects: | Laser welding, Energy dispersive X-ray spectroscopy, Stress concentration, Electron backscattering, Crystallography, Fluorescence |
| Abstract: | The ultra-short-pulse (USP) laser joining of sapphire to iron is investigated by combining electron backscatter diffraction (EBSD) and ruby (Cr3+) R1 fluorescence mapping to resolve the joint microstructure and pressure distributions. Energy-dispersive X-ray spectroscopy (EDS) reveals Al, O, and Fe intermixing within the seam, consistent with the formation of thin Fe–Al–O reaction layers. R1 fluorescence yields a maximum internal pressure of (490 ± 80) MPa within the modified sapphire region and decays to near-zero within a few micrometres distance from the seam. EBSD data suggest a single-crystal sapphire lattice with localized disorientation adjacent to the joint, whereas the iron foil remains polycrystalline with rolling-induced misorientation without additional weld-induced grain refinement. These results demonstrate that USP joining of sapphire to iron produces localized interfacial reaction zones, with confined pressure predominantly occurring within sapphire. [ABSTRACT FROM AUTHOR] |
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| Database: | Engineering Source |
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| Abstract: | The ultra-short-pulse (USP) laser joining of sapphire to iron is investigated by combining electron backscatter diffraction (EBSD) and ruby (Cr3+) R1 fluorescence mapping to resolve the joint microstructure and pressure distributions. Energy-dispersive X-ray spectroscopy (EDS) reveals Al, O, and Fe intermixing within the seam, consistent with the formation of thin Fe–Al–O reaction layers. R1 fluorescence yields a maximum internal pressure of (490 ± 80) MPa within the modified sapphire region and decays to near-zero within a few micrometres distance from the seam. EBSD data suggest a single-crystal sapphire lattice with localized disorientation adjacent to the joint, whereas the iron foil remains polycrystalline with rolling-induced misorientation without additional weld-induced grain refinement. These results demonstrate that USP joining of sapphire to iron produces localized interfacial reaction zones, with confined pressure predominantly occurring within sapphire. [ABSTRACT FROM AUTHOR] |
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| ISSN: | 20794991 |
| DOI: | 10.3390/nano16120737 |
