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项俊锋,解丽静,胡鑫,霍石岩,庞思勤,王西彬.SiCp/Al复合材料超精密车削仿真与试验研究[J].稀有金属材料与工程(英文),2019,48(5):1687~1696.[Junfeng Xiang,Lijing Xie,Xin Hu,Shiyan Huo,Siqin Pang and Xibin Wang.Simulation and Experimental Research on Ultra-precision Turning of SiCp/Al Composites[J].Rare Metal Materials and Engineering,2019,48(5):1687~1696.]
Simulation and Experimental Research on Ultra-precision Turning of SiCp/Al Composites
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Received:February 07, 2018  Revised:March 14, 2018
Key words: SiCp/Al composites  ultra-precision turning  molecular dynamics  single crystal diamond  brittle-plastic transition
Foundation item:国家自然科学基金资助(51575051);国家科技重大专项(2012ZX04003051-3)
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Junfeng Xiang,Lijing Xie,Xin Hu,Shiyan Huo,Siqin Pang and Xibin Wang  
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      Aimed at the difficulty in producing high-quality machined surface due to the existence of brittle-phase SiC in SiCp/Al composites, this paper used the molecular dynamics simulation and ultra-precision turning test to investigate the material removal process of SiCp/Al composites at nanoscale, and focused on the machined surface formation mechanism, brittle-ductile transition and tool wear mechanism in single crystal diamond ultra-precision turning of SiCp/Al composites. The results indicate that high-pressure phase transition is the main reason for the brittle-ductile transition of brittle-phase SiC in SiCp/Al composites. With the increase of cutting depth, the removal of SiC particles in SiCp/Al composites experienced from ductile cutting mode to hybrid brittle-ductile cutting mode and finally to purely brittle cutting mode. The SiC-Al interface and soft Al matrix in SiCp/Al composites considerably affected the brittle-ductile cutting mode transition mechanism when machining SiC particles in SiCp/Al composites. The existence of tensile stress on the uncut chip could induce the peak of brittle SiC crack initiation in the cutting zone. The primary wear mechanisms of SCD tools were abrasive wear originated from hard SiC particles’ scrape and machining induced graphitization.