Transactions of Nanjing University of Aeronautics & Astronautics
Investigation on Material Response of 55% SiCp/Al Composites Induced by Pulsed Laser
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Abstract:
Silicon carbide particle reinforced aluminum matrix composites （SiCp/Al composites） are widely used in aviation， aerospace and electronic package. However， low machining efficiency， severe tool wear and poor surface quality are severe during the machining of SiCp/Al composites. Laser-induced oxidation is capable to improve the machinability of SiCp/Al composites. The material response of 55% （volume fraction） SiCp/Al composites induced by a nanosecond pulsed laser is studied. A metamorphic layer which is composed of an oxide layer and sub-layer is produced. The effects of reaction surrounding and laser average power on the microstructure and thickness of the oxide layer and sub-layer are investigated. Experimental results show that： A thicker oxide layer and a sub-layer are formed in an oxygen-rich atmosphere. The oxides are mainly composed of 2Al2O3·SiO2 （mullite）. A positive correlation between the laser average power and thicknesses of oxide layers and sub-layers is found. A loose oxide layer of 138 μm and a sub-layer of 21 μm are formed at the laser average power of 6 W， laser scanning pitch of 10 μm， and laser scanning speed of 1 mm/s under an oxygen-rich atmosphere. The high efficient machining of SiCp/Al composites can be realized by laser-induced oxidation.
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This work was supported by the National Natural Science Foundation of China （Nos.51705249， 52075255）， the China Postdoctoral Science Foundation （No.2019M661823）.
Clc Number:
TB33
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