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,2019,48(5):1687~1696.[Junfeng Xiang,Lijing Xie,Xin Hu,Shiyan Huo,Siqin Pang,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.]
SiCp/Al复合材料超精密车削仿真与试验研究
投稿时间:2018-02-07  修订日期:2018-03-14
中文关键词:  SiCp/Al复合材料  超精密车削  分子动力学  单晶金刚石  脆塑性转变
基金项目:国家自然科学基金资助(51575051);国家科技重大专项(2012ZX04003051-3)
中文摘要:
      针对SiCp/Al复合材料因脆性相SiC的加入而导致难以形出高质量加工表面等问题,本文采用分子动力学模拟和超精密车削试验的方法对SiCp/Al复合材料纳米尺度材料去除过程进行研究,重点分析了单晶金刚石超精密切削SiCp/Al复合材料中的加工表面形成机理、脆塑性转变以及刀具磨损机理。结果表明:高压相变是引起SiCp/Al复合材料中SiC脆性材料的脆塑性转变的主要原因。随着切削深度的递增,SiCp/Al复合材料中SiC颗粒加工方式由延性去除,到脆塑性混合方式去除,最后演变为纯脆性方式。SiCp/Al复合材料中SiC-Al界面和Al基体存在,影响了SiCp/Al复合材料中SiC颗粒去除的脆塑性转变机制。待加工表面上拉应力的存在会诱导微裂纹尖峰,是切削区域脆性SiC材料裂纹萌生的直接诱因。单晶金刚石刀具主要磨损机理为硬质SiC颗粒的磨粒磨损和切削诱导的石墨化。
Simulation and Experimental Research on Ultra-precision Turning of SiCp/Al Composites
英文关键词:SiCp/Al composites  ultra-precision turning  molecular dynamics  single crystal diamond  brittle-plastic transition
英文摘要:
      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.
作者单位E-mail
项俊锋 北京理工大学 机械与车辆学院 xiang_junfeng@126.com 
解丽静 北京理工大学 机械与车辆学院 rita_xie2004@163.com 
胡鑫 北京理工大学 机械与车辆学院  
霍石岩 北京理工大学 机械与车辆学院  
庞思勤 北京理工大学 机械与车辆学院  
王西彬 北京理工大学 机械与车辆学院  
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