摘要
利用分离式霍普金森压杆实验装置,对TA1纯钛帽形试样进行高应变速率下的动态冲击实验,并利用金相显微镜(OM)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)和电子背散射衍射(EBSD)技术研究了不同应变速率下纯钛的绝热剪切行为及变形机制。结果表明:在动态加载下,纯钛帽形试样的强迫剪切区出现明显的绝热剪切带。随着应变速率的增加,绝热剪切带宽度变窄,长度增加,表现出较大的绝热剪切敏感性。纯钛绝热剪切带中心区的变形机制是由绝热温升和剧烈塑性变形的共同作用而发生的几何动态再结晶,过渡区的变形机制以位错滑移为主,孪生变形辅助,而基体的塑性变形机制为位错滑移和孪生共同主导。
In order to investigate the adiabatic shear behavior and deformation mechanism of TA1 pure titanium,dynamic impact experiments were carried out using the Split Hopkinson Press Bar(SHPB)set up on a TA1 pure titanium hat-shaped specimen.The microstructure after dynamic deformation was characterized using Optical Microscopy(OM),Scanning Electron Microscopy(SEM),Transmission Electron Microscopy(TEM)and Electron Backscattering Diffraction(EBSD)techniques.The results show that forced shear region of TA1 pure titanium hat-shaped specimen occurs the obvious adiabatic shear bands(ABS)under dynamic loading.With the strain rate increasing,the width of the adiabatic shear band decreases and the length of the adiabatic shear band increases,which exhibits the higher adiabatic shear sensitivity.The deformation mechanism of the center region in the shear band is geometric dynamic recrystallization induced by adiabatic temperature rise and severe plastic deformation.The deformation mechanism of the transition region is dominated by dislocation slip and assisted by twin deformation,while the dislocation slip and twin deformation are both the main deformation mechanisms of the matrix.
作者
刘晓燕
李帅康
陈文文
王子轩
LIU Xiaoyan;LI Shuaikang;CHEN Wenwen;WANG Zixuan(School of Metallurgical Engineering,Xi′an University of Architecture&Technology,Xi′an 710055,China)
出处
《有色金属工程》
CAS
北大核心
2024年第7期60-67,共8页
Nonferrous Metals Engineering
基金
陕西省自然科学基金面上项目(2023-JC-YB-312)
陕西省教育厅重点实验室项目(20JS075)。
关键词
纯钛
动态冲击实验
绝热剪切行为
变形机制
pure titanium
dynamic impact test
adiabatic shear behavior
deformation mechanism
作者简介
刘晓燕(1980-),女,博士,副教授,主要从事钛及钛合金的组织与性能研究。
