Descripción
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Laser Shock Processing (LSP) is based on focusing a pulse of a high energy laser (I > 109 W/cm2, ? < 50 ns) over a piece of metal. It results in the instantaneous vaporization of the piece?s surface and the generation of a high temperature and density plasma composed of the dierent ionized species of elements present in the piece and in the atmosphere. The high pressure of the plasma generates a shock wave that propagates to the piece, which aects its mechanical characteristics. Today, LSP is a consolidated alternative for improving the surface properties of metal alloys. This technique has been studied since the 1960s, when Askar?yan and Moroz [1] discovered that a high-energy laser pulse produces backpressures in the surface of the metal material on which the laser is focused (target). In Fairand et al. [2] it was found that laser shocking induced a tangled dislocation substructure similar to explosively shocked aluminum. The stress waves were studied using the piezoelectric response of X-cut quartz-crystal disks by Yang [3]. Since then, numerous works have aimed at finding the best conditions in which the technique should be applied. In 1990, Fabbro et al. [4] quantitatively described the evolution of the plasma in a LSP experiment under confined geometry using dierent characteristic plasma-dynamics stages, including plasma pressure buildup, plasma development under the laser irradiation, and final plasma expansion until the pressure decreases and it is too low to cause plastic deformation in the material. An explanation of this phenomenon was given by Berthe et al. [5]. | |
Internacional
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Si |
JCR del ISI
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Si |
Título de la revista
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Metals |
ISSN
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2075-4701 |
Factor de impacto JCR
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1,704 |
Información de impacto
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Datos JCR del año 2017 |
Volumen
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9 |
DOI
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10.3390/met9070808 |
Número de revista
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7 |
Desde la página
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808 |
Hasta la página
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822 |
Mes
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JULIO |
Ranking
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