摘要
切削纯钛时加工表面产生的氧化膜会影响其物理性质。为探究纯钛在切削过程中的氧化膜特性,对纯钛进行单因素切削试验,观察氧化膜的形貌特征,检测其物相组成,并基于密度泛函理论的第一性原理分析氧化膜的形成机理。研究结果表明:切削表面生成一层氧化膜,其主要由TiO2构成,随着进给量增加,TiO2的含量逐渐增多;氧化膜表面凸凹不平,波形图上相邻波峰和波谷之间的距离及高度差均随着进给量的增加而增大;切削表面产生严重塑性变形,塑性变形厚度随进给量增加而增大;纯钛发生高温氧化时,氧原子被钛原子吸附至加工表面,并与钛原子间发生电荷转移生成O—Ti共价键,其与钛原子的结合能力由表及里逐渐减弱。
When pure titanium is cut, the oxide film can be formed on the machined surface, which affects its physical properties.In order to study the characteristics of the oxide film of pure titanium in the cutting process, the single-factor cutting experiment is carried out.The morphology of the oxide film is observed, the phase composition is analyzed, and the first-principles method based on density functional theory is used to analyze its formation mechanism.The results show that a layer of oxide film is formed on the machined surface, which is mainly composed of TiO2.The content of TiO2increases with feed rate.The surface of the oxide film is uneven.The distance between peaks and valleys on the wave form graph increases with the increase of the feed rate.Severe plastic deformation occurs and the thickness of plastic deformation gradually increases.When pure titanium is oxidized at high temperature, O atoms are adsorbed by Ti atoms to the machined surface to form the corresponding O—Ti covalent bond and have charge transfer with titanium atoms.However, the bonding ability between oxygen atoms and titanium atoms is gradually weakened from the machined surface to the matrix.
作者
沈号伦
孙非瑀
李金泉
SHEN Haolun;SUN Feiyu;LI Jinquan(Shenyang Ligong University,Shenyang 110159,China)
出处
《沈阳理工大学学报》
CAS
2023年第1期73-78,共6页
Journal of Shenyang Ligong University
基金
国家自然科学基金项目(51775357)。
关键词
纯钛
氧化膜
塑性变形
第一性原理
pure titanium
oxide film
plastic deformation
first-principles
