Micro-milling of 65 vol% SiCp/Al composites with a novel laser-assisted hybrid process
作者： Guolong Zhao , Pengcheng Mao , Liang Li , Asif Iqbal , Ning He
DOI: 10.1016/J.CERAMINT.2020.07.107
关键词: Surface integrity 、 Machinability 、 Surface finish 、 Oxide 、 Microstructure 、 Composite material 、 Tool wear 、 Laser power scaling 、 Aluminium 、 Materials science
摘要: Abstract Micro-machining of high-volume fraction SiC particles reinforced aluminum matrix (SiCp/Al) composites is characterized by high specific cutting forces, rapid tool wear, and deteriorated surface integrity. This study presents an innovative approach laser-induced oxidation assisted micro-milling (LOMM) to improve micro-machinability 65 vol% SiCp/Al composites. An easy-to-remove metamorphic layer, which composed oxide layer a sub-layer, produced when the material treated nanosecond laser in oxygen-rich environment. The mechanism investigated. Under average power 8 W, scanning speed 1 mm/s, track displacement 10 μm environment, thicknesses sub-layer are 187.3 μm 32.5 μm, respectively. microstructure reveals that porous, causes generation extremely low force 0.3 N during its removal, thus, improving machinability. Cavities pits distributed on sub-layer. removal mechanisms include brittle fracture reinforcements ductile matrix. Small cavities fissures formed machined surface. performance LOMM respect forces quality compared with conventional micro-milling. normal thrust observed much lower than those roughness (Sa) 147 nm, far superior 471 nm comparative validates practicability effectiveness proposed hybrid process.
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