Multilayered polycrystallization in single-crystal YSZ by laser-shock compression

Nishimura, Yasumasa; Kitagawa, Yoneyoshi; Mori, Yoshitaka; Hioki, Tatsumi; Azuma, Hirozumi; Tagaya, Motohiro; Komeda, Osamu; Ishii, Katsuhiro; Hanayama, Ryohei; Sekine, Takashi; Sunahara, A.; Kajino, Toshitaka; Nishi, Teppei; Kondo, Takuya; Fujine, Manabu; Sato, N.; Kitahara, Takashi; Kawashima, Toshiyuki; Kan, Hirofumi; Miura, Eisuke; Sentoku, Y.

doi:10.1088/0022-3727/48/32/325305

Cited by 6 publications

(7 citation statements)

References 13 publications

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“…In that study, the crystal was penetrated to a maximum depth of 96 µm by a laser-driven shock wave with 7.6 × 10 12 Pa intensity, causing formation of a four-layered structure. The residual stresses on the focal spot areas seemed to be held in the film thickness direction by this surface polycrystallisation [19]. In those experiments, the present authors also observed a linear scratch pattern on the bulk surface of the specimen, having an area much larger than the laser irradiation spot size of 60 µm [19].…”

Section: Introductionsupporting

confidence: 69%

“…zirconia and graphite), using ultra-intense laser-driven compression [19,20]. Hence, multilayered polycrystallisation was achieved by the present authors in single-crystal yttria-stabilised-zirconia (YSZ) [19]. In that study, the crystal was penetrated to a maximum depth of 96 µm by a laser-driven shock wave with 7.6 × 10 12 Pa intensity, causing formation of a four-layered structure.…”

Section: Introductionmentioning

confidence: 87%

“…In previous experiments, the present authors performed surface modification of functional materials, such as ceramics (e.g. zirconia and graphite), using ultra-intense laser-driven compression [19,20]. Hence, multilayered polycrystallisation was achieved by the present authors in single-crystal yttria-stabilised-zirconia (YSZ) [19].…”

Section: Introductionmentioning

confidence: 91%

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Modification of single-crystalline yttria-stabilised zirconia induced by radiation heating from laser-produced plasma

Mori

Sunahara

Nishimura

et al. 2019

J. Phys. D: Appl. Phys.

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Thermal modifications induced by intense laser pulse irradiation of a material surface are studied. Single-crystalline yttria-stabilised zirconia (YSZ) is irradiated with Joule-class intense laser pulses with three focal intensities of 10 12 , 10 13 , and 10 17 W cm −2 at pulse durations of 15 ns, 300 ps and 110 fs, respectively. The physical surface properties of the irradiated YSZ are determined using an optical digital microscope, a scanning electron microscope and x-ray diffraction methods. In all three cases, a linear scratch pattern along the crystal orientation on the YSZ surface is found, which surrounds the laser irradiation spot area (diameter: 60 µm). In the 15 ns case, the focal spot area is polycrystallised with a tensile residual stress of 0.45 ± 0.05 GPa. However, the linear scratch pattern of 1.8 mm in diameter remains in the single-crystalline phase of YSZ, having a residual stress below the detection limit. A two-dimensional radiation-hydrodynamic simulation reveals that a radiative plasma source generated on the focal spot by the laser irradiation ablates the material surface. A region of approximately 1.4 mm in diameter is affected by an ion temperature beyond 0.25 eV; hence, ablation of the material surface to a thickness of 1 µm order is observed. The diameter of this simulated ablation region is consistent with that of the linear scratch patterns observed in the experiments to within a factor 1.3. The findings of this study indicate that a large area relative to the laser focal area can be modified by radiation heating in a laser-induced material

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Section: Introductionsupporting

confidence: 69%

Section: Introductionmentioning

confidence: 87%

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Modification of single-crystalline yttria-stabilised zirconia induced by radiation heating from laser-produced plasma

Mori

Sunahara

Nishimura

et al. 2019

J. Phys. D: Appl. Phys.

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“…Firn processes influence the glacier mass balance, which is a key parameter in detecting global warming trends. Meltwater retention in firn can either attenuate (Haeberli and Alean, 1985; Suter and others, 2004; Cox and others, 2015) or promote glacier mass loss (Braithwaite and others, 1994; Machguth and others, 2016). A steepening of mass-balance gradients (Dyurgerov and Dwyer, 2001) is likely to be reflected in firn changes.…”

Section: Introductionmentioning

confidence: 99%

Comparison of historical and recent accumulation rates on Abramov Glacier, Pamir Alay

et al. 2020

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Glaciers located in western High Mountain Asia (HMA) have shown mass gain or limited mass losses compared to other mountain regions since ~2000. Increases in accumulation may be responsible. Although no contemporary measurements exist to explore this hypothesis, extensive historic measurements including firn density, stratigraphy and accumulation rates at ~4400 m a.s.l. on Abramov Glacier, Pamir Alay, provide valuable indications of accumulation changes. Abramov Glacier is located at the northern margin of western HMA. In this study, we assess unique historical firn data of Abramov Glacier from the 1970s to evaluate past firn conditions in this data sparse region. The current firn state is investigated based on a series of in situ measurements including firn cores and ground-penetrating radar measurements performed in 2018. We compare the legacy data with contemporary firn characteristics. Our results indicate a high year-to-year variability, but generally increasing net accumulation during the last 60 years on Abramov Glacier, with 0.84 ± 0.22 m w.e. for 2011–18 compared to 0.68 ± 0.32 m w.e. for 1965–72 and 0.59 ± 0.22 m w.e. for 1970–97. These results from in situ data provide ground truth for the data-sparse western HMA.

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“…Knowledge of the near-surface firn stratigraphy is important for interpreting altimetrically derived measurements of glacier surface height in terms of changes in glacier mass balance [Parry et al, 2007]. The glacier surface height in the accumulation area is affected by changes in the near-surface firn density, even in the absence of mass changes [Braithwaite et al, 1994]. Ice layer formation by meltwater percolation/refreezing can significantly increase firn densification rates, causing a lowering of the glacier surface height.…”

Section: Introductionmentioning

confidence: 99%

Characterizing near‐surface firn using the scattered signal component of the glacier surface return from airborne radio‐echo sounding

Rutishauser

Grima

Sharp

et al. 2016

Geophysical Research Letters

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We derive the scattered component (hereafter referred to as the incoherent component) of glacier surface echoes from airborne radio‐echo sounding measurements over Devon Ice Cap, Arctic Canada, and compare the scattering distribution to firn stratigraphy observations from ground‐based radar data. Low scattering correlates to laterally homogeneous firn above 1800 m elevation containing thin, flat, and continuous ice layers and below 1200 m elevation where firn predominantly consists of ice. Increased scattering between elevations of 1200–1800 m corresponds to firn with inhomogeneous, undulating ice layers. No correlation was found to surface roughness and its theoretical incoherent backscattering values. This indicates that the scattering component is mainly influenced by the near‐surface firn stratigraphy, whereas surface roughness effects are minor. Our results suggest that analyzing the scattered signal component of glacier surface echoes is a promising approach to characterize the spatial heterogeneity of firn that is affected by melting and refreezing processes.

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Multilayered polycrystallization in single-crystal YSZ by laser-shock compression

Cited by 6 publications

References 13 publications

Modification of single-crystalline yttria-stabilised zirconia induced by radiation heating from laser-produced plasma

Modification of single-crystalline yttria-stabilised zirconia induced by radiation heating from laser-produced plasma

Comparison of historical and recent accumulation rates on Abramov Glacier, Pamir Alay

Characterizing near‐surface firn using the scattered signal component of the glacier surface return from airborne radio‐echo sounding

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