研究目的
Investigating the use of graphene as reinforcement and interlocking the grains in nanocomposites, and the effects of low energy laser shock peening (LSP) on these nanocomposites.
研究成果
The study demonstrated significant improvements in the microstructure and mechanical properties of graphene dispersion strengthened aluminium nanocomposites through the addition of graphene and subsequent LSP treatment. The addition of graphene improved the ultimate tensile strength by 42.93%, and LSP contributed an additional 10.66% improvement. The findings highlight the potential of graphene as a reinforcement material and the effectiveness of LSP in enhancing the properties of nanocomposites.
研究不足
The study focuses on the effects of LSP on graphene dispersion strengthened aluminium nanocomposites, with specific parameters and conditions that may limit the generalizability of the findings to other materials or processing conditions.
1：Experimental Design and Method Selection:
The study involved the fabrication of graphene (
2：4 wt %) - AA 7075 nanocomposites through powder metallurgy (PM) technique and hot extrusion (
1 extrusion ratio), followed by surface modification through low energy laser shock peening (LSP).
3：Sample Selection and Data Sources:
Graphene with average X-Y dimensions of ~5-10 μm and AA 7075 alloy powder (~ 10 μm in dia, >
4：98% purity) were used. List of Experimental Equipment and Materials:
Q-switched Nd: YAG laser, Poly Vinyl Chloride (PVC) tape, X-ray diffraction (XRD), Electron backscatter diffraction (EBSD), Transmission Electron Microscope (TEM), Vickers microhardness tester, Nanoindentation instrument, Confocal microscope, X-ray photoelectron spectroscopy (XPS).
5：Experimental Procedures and Operational Workflow:
The nanocomposites were subjected to LSP with specific parameters, followed by characterization of microstructure, mechanical properties, and surface characteristics.
6：Data Analysis Methods:
The data were analyzed using various techniques including XRD, EBSD, TEM, microhardness testing, nanoindentation, and tensile testing.
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Q-switched Nd: YAG laser
Litron lasers
Litron
Used for laser shock peening (LSP) process.
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X-ray diffraction
X’pert3 MRD (XL)
Bruker
Used for analyzing the internal phase constituents of the nanocomposites.
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Electron backscatter diffraction
EBSD
Fei Quanta 3D FEG
Used for crystallographic characterization to study texture and crystal orientation.
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X-ray photoelectron spectroscopy
PHI 5000 Versa Prob II
FEI Inc.
Used for analyzing the nanocomposites elements before and after the LSP.
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Field emission scanning electron microscope
FE-SEM
Used for characterizing the morphology of graphene and AA 7075 alloy powder particles.
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Transmission Electron Microscope
TEM
FEI Tecnai TF20
Used for studying the internal microstructure of the nanocomposites.
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Vickers microhardness tester
Matsuzawa MMT-X
Matsuzawa
Used for conducting microhardness tests according to ASTM E-384.
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Nanoindentation instrument
NTEGRA Prima
Used for nanoindentation measurements.
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Confocal microscope
LEXT OLS4000
Japan
Used for characterizing the surface topology and roughness measurement.
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