摘要
为了研究空位缺陷对γ-TiAl涂层阻尼性能的影响,采用分子动力学方法(MD)对不同空位浓度的γ-TiAl涂层模型进行往复振动模拟计算。比较分析了应力-应变、储存势能、位错线密度、缺陷面积的变化及微观结构的变化机制。结果表明:随着空位浓度的升高,γ-TiAl涂层能耗逐渐增加,弹性模量逐渐减小,涂层提前发生疲劳破坏;不同空位浓度γ-TiAl涂层的储存势能均呈周期性变化,变化幅度随空位浓度的升高而逐渐减小;在振动模拟过程中,空位缺陷会演化为位错线及其它缺陷,导致位错密度和缺陷面积升高,不同缺陷的运动、演化及湮灭是γ-TiAl涂层产生能耗的主要来源;另外,高空位浓度的γ-TiAl涂层内部产生较多的塑性变形,出现颈缩和孔洞等缺陷,使阻尼发生失效。
In order to study the effect of vacancy defects on the damping performance ofγ-TiAl coating,molecular dynamics(MD)was used to simulate the reciprocating vibration ofγ-TiAl coating with different vacancy concentrations.The changes of stress-strain,stored potential energy,dislocation line density,defect area,and microstructure were compared and analyzed.The results show that with the increase in vacancy concentration,the energy consumption ofγ-TiAl coating increases gradually,and the damping performance is enhanced obviously.The stored potential energy ofγ-TiAl coating with different vacancy concentrations changes periodically,and the range of variation decreases gradually with the increase in vacancy concentration.In the process of vibration simulation,vacancy defects will evolve into dislocation lines and other defects,resulting in increased dislocation density and defect area.The movement,evolution and annihilation of different defects are the main sources of energy consumption ofγ-TiAl coating.In addition,γ-TiAl coating with high vacancy concentrations produces more plastic deformation,neck shrinkage and more holes,which further increases the energy dissipation.
作者
王宁
杨帆
叶枭宇
邵长铖
杜广煜
姜文全
Wang Ning;Yang Fan;Ye Xiaoyu;Shao Changcheng;Du Guangyu;Jiang Wenquan(School of Mechanical Engineering,Liaoning Petrochemical University,Fushun 113005,China;College of Petroleum Engineering,Liaoning Petrochemical University,Fushun 113005,China;School of Mechanical Engineering and Automation,Northeastern University,Shenyang 110819,China)
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2024年第6期1761-1769,共9页
Rare Metal Materials and Engineering
基金
国家重点研发计划(SQ2020YFB200353-4)
辽宁省教育厅科学研究经费项目(L2019024,LJKMZ20220725)。
关键词
阻尼性能
分子动力学
γ-TiAl涂层
位错密度
能量耗散
damping performance
molecular dynamics
γ-TiAl coating
dislocation density
energy dissipation
作者简介
王宁,男,1995年生,硕士生,辽宁石油化工大学机械工程学院,辽宁抚顺113005,电话:024-89774672,E-mail:771929775@qq.com;Corresponding author:Jiang Wenquan,Ph.D.,Associate Professor,School of Mechanical Engineering,Liaoning Petrochemical University,Fushun 113005,P.R.China,E-mail:jiangwenquan@lnpu.edu.cn。
