Surface strengthening of single-crystal alumina by high-temperature laser shock peening

This manuscript reports a novel process of high-temperature laser shock peening (HTLSP) for surface strengthening of single-crystal ceramics such as sapphire and reveals its fundamental mechanisms. HTLSP at 1200°C can induce a high compressive residual stress on the surface of sapphire while minimiz...

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Bibliographic Details
Published inMaterials research letters Vol. 9; no. 3; pp. 155 - 161
Main Authors Wang, Fei, Yan, Xueliang, Liu, Lei, Nastasi, Michael, Lu, Yongfeng, Cui, Bai
Format Journal Article
LanguageEnglish
Published New York Taylor & Francis Ltd 04.03.2021
Taylor & Francis Group
Subjects
alumina
Aluminum oxide
Compressive properties
Dislocation density
Fracture toughness
High temperature
Laser damage
laser shock peening
Laser shock processing
Lasers
Peening
Plastic deformation
Residual stress
Sapphire
Shock waves
Single crystals
single-crystal ceramics
Strain rate
Strengthening
surface strengthening
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Summary:This manuscript reports a novel process of high-temperature laser shock peening (HTLSP) for surface strengthening of single-crystal ceramics such as sapphire and reveals its fundamental mechanisms. HTLSP at 1200°C can induce a high compressive residual stress on the surface of sapphire while minimize the damage of laser-driven shock waves. Transmission electron microscopy characterizations revealed high dislocation densities near the surface, suggesting that plastic deformation at an ultrahigh strain rate was generated by the high shock wave pressure. The HTLSP-induced compressive residual stress can significantly improve the hardness and fracture toughness of sapphire, while maintain its outstanding optical transmittance.
ISSN:2166-3831
2166-3831
DOI:10.1080/21663831.2020.1862933