Multilayered polycrystallization in single-crystal YSZ by laser-shock compression
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Authors
Nishimura, Yasuhiko
Kitagawa, Yoneyoshi
Mori, Yoshitaka
Hioki, Tatsumi
Azuma, Hirozumi
Motohiro, Tomoyoshi
Komeda, Osamu
Ishii, Katsuhiro
Hanayama, Ryohei
Sekine, Takashi
Issue Date
2015
Type
Article
Language
Keywords
laser-shock compression , polycrystallization , ultra-intense laser
Alternative Title
Abstract
A single shot of an ultra-intense laser with 0.8 J of energy and a pulse width of 110 fs (peak intensity of 1.15 x 10(17) W cm(-2)) is divided into two beams and the two beams counter-irradiated onto a 0.5 mm-thick single crystal yttria-stabilized zirconia (YSZ), changing the YSZ into a multilayered polycrystalline state. The laser-driven shock wave of the intensity similar to 7.6x10(12) Pa penetrated the crystal as deep as 96 mu m, causing formation of a four-layered structure (the first layer from the surface to 12 mu m, the second from 12 to 28 mu m, the third from 28 to 96 mu m, and the fourth from 96 to 130 mu m, respectively). The grain size of the first layer was 1 mu m, while that of the second layer was broken into a few tens nanometers. The grain size of the third layer was a few hundred nanometers to a few ten micrometers. The area deeper than 96 mu m remained as a single crystal. The plasma heat wave might remelt the first layer, resulting in the grain size becoming larger than that of the second layer. The surface polycrystallization seems to maintain the residual stresses frozen in the film thickness direction. Our experimentally observed spatial profile of the grain size can be explained by this shock and heat waves model.
Description
Citation
Nishimura, Y., Kitagawa, Y., Mori, Y., Hioki, T., Azuma, H., Motohiro, T., � Sentoku, Y. (2015). Multilayered polycrystallization in single-crystal YSZ by laser-shock compression. Journal of Physics D: Applied Physics, 48(32), 325305. doi:10.1088/0022-3727/48/32/325305
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License
Creative Commons Attribution 3.0 Unported
Journal
Volume
Issue
PubMed ID
ISSN
0022-3727