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Effect of sintering temperature on microstructures and mechanical properties of spark plasma sintered nanocrystalline aluminum
Highlights Nanocrystalline Al was fabricated with organic-coated nano Al powders by SPS. The nanocrystalline Al SPSed at 773K has the highest micro-hardness of 3.06GPa. The nanocrystalline Al SPSed at 773K has the best compressive strength of 665MPa. Both strength and strain of the nanocrystalline Al were improved after annealed.
Abstract Organic-coated aluminum nano-powders were consolidated by spark plasma sintering technique with low initial pressure of 1MPa and high holding pressure of 300MPa at different sintering temperature. The effect of sintering temperature on microstructures and mechanical properties of the compact bulks was investigated. The results indicate that both the density and the strain of the nanocrystalline aluminum increase with an increase in sintering temperature. However, the micro-hardness, compressive strength and tensile stress of the compact bulks increase initially and then decrease with increasing sintering temperature. The nanocrystalline aluminum sintered at 773K has the highest micro-hardness of 3.06GPa, the best compressive strength of 665MPa and the supreme tensile stress of 282MPa. A rapid grain growth of nanocrystalline aluminum sintered at 823K leads to a decrease in micro-hardness, compressive strength and tensile stress. After annealing, a remarkable increase in strain and a slight rise in strength were obtained due to the relief of the residual stress in nanocrystalline Al and the formation of composite structure.
Effect of sintering temperature on microstructures and mechanical properties of spark plasma sintered nanocrystalline aluminum
Highlights Nanocrystalline Al was fabricated with organic-coated nano Al powders by SPS. The nanocrystalline Al SPSed at 773K has the highest micro-hardness of 3.06GPa. The nanocrystalline Al SPSed at 773K has the best compressive strength of 665MPa. Both strength and strain of the nanocrystalline Al were improved after annealed.
Abstract Organic-coated aluminum nano-powders were consolidated by spark plasma sintering technique with low initial pressure of 1MPa and high holding pressure of 300MPa at different sintering temperature. The effect of sintering temperature on microstructures and mechanical properties of the compact bulks was investigated. The results indicate that both the density and the strain of the nanocrystalline aluminum increase with an increase in sintering temperature. However, the micro-hardness, compressive strength and tensile stress of the compact bulks increase initially and then decrease with increasing sintering temperature. The nanocrystalline aluminum sintered at 773K has the highest micro-hardness of 3.06GPa, the best compressive strength of 665MPa and the supreme tensile stress of 282MPa. A rapid grain growth of nanocrystalline aluminum sintered at 823K leads to a decrease in micro-hardness, compressive strength and tensile stress. After annealing, a remarkable increase in strain and a slight rise in strength were obtained due to the relief of the residual stress in nanocrystalline Al and the formation of composite structure.
Effect of sintering temperature on microstructures and mechanical properties of spark plasma sintered nanocrystalline aluminum
Liu, Zhen-Feng (author) / Zhang, Zhao-Hui (author) / Lu, Ji-Fang (author) / Korznikov, Alexander V. (author) / Korznikova, Elena (author) / Wang, Fu-Chi (author)
2014-08-12
6 pages
Article (Journal)
Electronic Resource
English
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