研究目的
Investigating the enhancement of mechanical properties and thermal stability of aluminum through the incorporation and dispersion of nanoparticles during laser additive manufacturing.
研究成果
The study demonstrates that aluminum with dense dispersed nanoparticles can be layer-deposited via laser additive manufacturing of AMNC powders, delivering the highest specific Young’s modulus and one of the best specific yield strengths among all structural metals, as well as an improved thermal stability at 400 °C amongst all aluminum-based materials. The pathway for laser 3D printing of nanoparticles reinforced metals can be readily extended to other materials for widespread applications.
研究不足
The study acknowledges the difficulty in achieving an effective incorporation and dispersion of populous nanoparticles during LAM. The high viscosity of the nanocomposite melt and the contamination of molten salt into the aluminum melt pose serious problems when the loading of nanoparticles exceeds 10 vol. %.
1：Experimental Design and Method Selection:
The study involved the design and fabrication of aluminum powders containing surface-coated and embedded nanoparticles suitable for laser additive manufacturing (LAM) experiments. The methodology included the use of laser melting of nanocomposite powders to deposit aluminum reinforced by nanoparticles layer-by-layer.
2：Sample Selection and Data Sources:
Aluminum matrix nanocomposite (AMNC) powders with dense TiC nanoparticles were systematically fabricated. The volume ratio between TiC nanoparticles and liquid aluminum was tuned to produce AMNC powders with different TiC loadings.
3：List of Experimental Equipment and Materials:
A 1070 nm fiber laser was used for the LAM process. The AMNC powders were fabricated using NaCl and KCl salt powders, TiC nanoparticles, and Al microparticles. A UV3101PC spectrophotometer was used to measure the reflectivity of the aluminum powder specimens.
4：Experimental Procedures and Operational Workflow:
The AMNC powders were manually deposited on a pre-machined Al 1100 alloy substrate. The laser scanning patterns were processed at temperatures of 25 °C or 300 °C. The layer deposition process was repeated to obtain a designed layer thickness.
5：Data Analysis Methods:
The mechanical properties of the laser-deposited AMNC specimens were evaluated using microcompression tests. The microstructure was characterized using SEM and TEM. The grain size was determined using EBSD mapping.
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