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Formation of nanostructure and nano-hardness characterization on the meso-scale workpiece by a novel laser indirect shock forming method
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http://aip.metastore.ingenta.com/content/aip/journal/rsi/84/4/10.1063/1.4798670
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Figures

Image of FIG. 1.

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FIG. 1.

(a) Schematic diagram of laser shock forming and (b) the layout of the experiment.

Image of FIG. 2.

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FIG. 2.

Optical observation of the original sample before LSF.

Image of FIG. 3.

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FIG. 3.

(a) The 3D plot of the formed sample with laser energy of 1020 mJ; (b) the surface profile curves with different laser energies, namely, 675 mJ, 1020 mJ, 1380 mJ, and 1690 mJ.

Image of FIG. 4.

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FIG. 4.

TEM image shows the dislocation configurations around the edge of the workpiece with laser energy of 1020 mJ.

Image of FIG. 5.

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FIG. 5.

(a) TEM image showing the refined microstructures at the bottom of workpiece with laser energy of 1020 mJ; (b) magnified image of zone A in (a); (c) magnified image of zone B in (a); (d) magnified image of zone C in (a).

Image of FIG. 6.

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FIG. 6.

(a) TEM image showing the microstructure far away from the bottom; (b) HRTEM image showing nano-twin bundles embedded in nanograins.

Image of FIG. 7.

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FIG. 7.

(a) Nanohardness and elastic modulus distributions along the center line after laser indirect shock forming with laser energy of 1020 mJ; (b) the mean values and standard deviations of the hardness and elastic modulus of the as-received material and laser deformed sample. Insert shows the equixed nanograins and the corresponding SAED pattern.

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/content/aip/journal/rsi/84/4/10.1063/1.4798670
2013-04-04
2014-04-19

Abstract

The meso-scale workpiece with greatly enhanced mechanical properties is potential to be widely used in the electronics productions and micro-electro mechanical systems. In this study, it demonstrates that the meso-scale cup-shape workpiece with good geometry can be obtained by a novel laser indirect shock forming method. After the forming process, the mechanical properties and microstructures of the formed workpiece were characterized. By transmission electron microscope observation, it was found that a mixed refined microstructure consisting of nano-scale twins embedded in nano-sized grains was produced at the center of the formed sample. Formation of these nanograins could be mainly attributed to two mechanisms: twin-twin intersections and twin/matrix lamellae fragmentation. By nanoindentation tests, it reveals that the hardness of the sample has increased greatly after laser shock forming and the hardness increases with the laser energy. The elevated hardness originates from a considerable number of nano-scale twins and nanograins, which possess a pretty high strength due to the significant effects of grain boundary strengthening and twin boundary strengthening.

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Scitation: Formation of nanostructure and nano-hardness characterization on the meso-scale workpiece by a novel laser indirect shock forming method
http://aip.metastore.ingenta.com/content/aip/journal/rsi/84/4/10.1063/1.4798670
10.1063/1.4798670
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