双磨粒微切削单晶γ-TiAl合金的材料去除机制  

Material Removal Mechanism of Single Crystal γ-TiAl Alloy by Double Abrasive Micro Cutting

作　　者：李俊烨[1] 解鸿偲 张心明[1] 赵伟宏[1] 石广丰[1] 徐成宇[1] Li Junye;Xie Hongcai;Zhang Xinming;Zhao Weihong;Shi Guangfeng;Xu Chengyu(Ministry of Education Key Laboratory for Cross-Scale Micro and Nano Manufacturing,Changchun University of Science and Technology,Changchun 130022,China)

机构地区：[1]长春理工大学跨尺度微纳制造技术教育部重点实验室,吉林长春130022

出　　处：《稀有金属材料与工程》2021年第2期396-407,共12页Rare Metal Materials and Engineering

基　　金：National Natural Science Foundation of China (51206011, U1937201);Science and Technology Development Program of Jilin Province (20200301040RQ);Project of Education Department of Jilin Province (JJKH20190541KJ);Science and Technology Program of Changchun City (18DY017)。

摘　　要：为了分析磨削过程中单晶γ-TiA l合金的材料去除机制,建立了双磨粒磨削Ti-Al合金的分子动力学模型。揭示了金刚石磨粒的横向间距和纵向间距对单晶γ-TiA l合金材料去除机制的影响。结果表明:单晶γ-TiA l合金的微切削过程中伴随有温度、势能、位错的变化以及晶格结构的转变;切削力、切削温度、势能以及去除效率随着横向间距的增加而增大,但受纵向间距的影响较小;晶格转变的原子数随横向间距的增加而增大,随纵向间距的增加而减小;随着横向间距和纵向间距的增加,位错数量、位错总长度以及位错密度相应增大。In order to analyze the material removal mechanism of single crystal γ-TiA l alloy in grinding, the molecular dynamics model of Ti-Al alloy ground by two abrasive grains was established. The influence of lateral and longitudinal spacing of the diamond abrasive on the material removal mechanism of the single crystal γ-TiA l alloy was revealed. The results show that the micro cutting process of single crystal γ-TiA l alloy is accompanied by the change of temperature, potential energy, dislocation, as well as lattice phase transition. Cutting force, cutting temperature, potential energy and removal efficiency increase with the increase of lateral spacing, but are less affected by longitudinal spacing. The number of lattice phase transition atoms increases with the increase of lateral spacing and decreases with the increase of longitudinal spacing. With the increase of lateral and longitudinal spacing, the number of dislocations, total length of dislocations, and density of dislocations increase accordingly.

关 键 词：单晶γ-TiAl合金 材料去除机制 分子动力学 

分 类 号：TG580.6[金属学及工艺—金属切削加工及机床]