本文已被:浏览 385次 下载 282次
投稿时间:2024-01-04 修订日期:2024-03-27
投稿时间:2024-01-04 修订日期:2024-03-27
中文摘要: 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。
中文关键词: 纯钛,动态冲击实验,绝热剪切行为,变形机制
Abstract: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 based on the 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(ASB) under dynamic loading. With the strain rate increasing, the width of adiabatic shear band decreases and the length of adiabatic shear band increases, which exhibits the higher adiabatic shear sensitivity. The deformation mechanism of the center region in 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.
文章编号:YSJSGC20240007 中图分类号:TB31 文献标志码:
基金项目: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)。
作者 | 单位 | |
刘晓燕* | 西安建筑科技大学冶金工程学院 | liuxiaoyan@xauat.edu.cn |
李帅康 | 西安建筑科技大学冶金工程学院 | 571697669@qq.com |
陈文文 | 西安建筑科技大学冶金工程学院 | 1870845378@qq.com |
王子轩 | 西安建筑科技大学冶金工程学院 |
引用文本:
刘晓燕,李帅康,陈文文,王子轩.TA1纯钛绝热剪切行为及变形机制研究[J].有色金属工程,2024,(7):.
刘晓燕,李帅康,陈文文,王子轩.TA1纯钛绝热剪切行为及变形机制研究[J].有色金属工程,2024,(7):.