摘要
采用分离式霍普金森压杆技术在TC18钛合金帽形试样中制备了剪切带;通过扫描电镜以及透射电子显微镜研究了TC18钛合金剪切带晶粒的微观结构与组织。结果表明,剪切带区域内材料屈服强度显著高于基体,且随实验环境温度降低而提高;剪切带的宽度随试样名义应变增大而变大,且与Grady公式预测结果吻合良好;剪切带内中心等轴晶区域内晶粒细小且分布均匀,位错缠结严重,多边形化现象明显,是典型的动态再结晶结果。
Shear bands were prepared in hat-shaped specimens of TC18 titanium alloy by using split Hopkinson pressure bar.The microstructure and tissue of the shear band in TC18 titanium alloy were investigated by scanning electron microscopy and transmission electron microscopy.It is found that the yield strength of the material in the shear band was significantly higher than that of the m atrix,and it increased with the decrease of experimental temperature.The width of the shear band increased with the increase in nominal strain of the specimen,in good agreement with the result of Grady formula prediction.The grains in the center of the isometric crystal zone were fine and evenly distributed,but severe dislocation and obvious polygonization were observed,indicating typical dynamic recrystallization took place.
作者
刘岚逸
汪冰峰
张晓泳
LIU Lan-yi;WANG Bing-feng;ZHANG Xiao-yong(School of Materials Science and Engineering,Central South University,Changsha 410083,Hunan,China;Powder Metallurgy Research Institute,Central South University,Changsha 410083,Hunan,China)
出处
《矿冶工程》
CAS
CSCD
北大核心
2018年第4期149-151,157,共4页
Mining and Metallurgical Engineering
基金
国家自然科学基金面上项目(51771231)
关键词
分离式霍普金森压杆
钛合金
动态力学性能
绝热剪切带
动态再结晶
split Hopkinson pressure bar
titanium alloy
dynamic mechanical property
adiabatic shear band
dynamic recrystallization
作者简介
刘岚逸(1993-),男,湖南衡阳人,硕士研究生,主要研究方向为钛合金动态力学性能及微观结构。;通讯作者:汪冰峰(1978-),男,湖南岳阳人,副教授,主要从事材料动态行为研究。
