摘要
对奥氏体状态下的钛镍形状记忆合金(SMA)的拉伸过程进行了声发射监测,通过声发射特征参数分析了SMA拉伸过程中的马氏体相变、塑性变形等细观力学行为。结果表明,马氏体相变过程中声发射源活动性最强,塑性变形过程的声发射源活动性较差;马氏体相变所产生的声发射信号振铃计数和持续时间分别小于100次和1 000μs;塑性变形所产生的声发射信号振铃计数和持续时间分别达到800次和4 000μs。上升时间-持续时间关联分析结果表明声发射源可分为马氏体相变和塑性变形两类,振铃计数-幅值关联分析可将声发射源分为马氏体相变、塑性变形起始以及屈服断裂3类。
The tensile process of Ti-Ni shape memory alloy(SMA)in austenitic state was monitored by acoustic emission(AE)technology.The mesomechanics behaviors such as martensitic transformation and plastic deformation were analyzed by acoustic emission characteristic.The results showed that the activity of acoustic emission source was the strongest during martensitic transformation,while the activity was poor during plastic deformation.The ringing count and duration of acoustic emission signals generated by martensitic transformation were less than100times and1000μs respectively,while the highest ringing count and duration of acoustic emission signals generated by plastic deformation reached to800times and4000μs respectively.The results about the rise time-duration correlation analysis showed that the acoustic emission source could be divided into martensitic transformation and plastic deformation.And the AE source could be divided into martensite transformation,plastic deformation developing and yield fracture using the correlation analysis of counts-amplitude method.
作者
邢鸿雁
张旭鹏
齐刚
XING Hongyan;ZHANG Xupeng;QI Gang(Tianjin Key Laboratory of Integrated Design and On-line Monitoring for Light Industry & Food Machinery and Equipment, College of Mechanical Engineering,Tianjin University of Science and Technology, Tianjin 300222, China;Department of Mechanical Engineering, Memphis University, Memphis 38152, USA)
出处
《功能材料》
EI
CAS
CSCD
北大核心
2018年第3期3146-3151,共6页
Journal of Functional Materials
基金
国家自然科学基金资助项目(11272234)
青年科学基金资助项目(51405342)
关键词
声发射
钛镍形状记忆合金
力学行为
拉伸
acoustic emission
Ti-Ni shape memory alloy
mechanical behavior
tensile
