不同组织Ti6321合金的绝热剪切行为研究  

Research on Adiabatic Shear Behavior of Ti6321 Alloy with Different Microstructures

作　　者：李严星 王琳[1,2,3] 闫志维 周哲 宁子轩 刘安晋 Li Yanxing;Wang Lin;Yan Zhiwei;Zhou Zhe;Ning Zixuan;Liu Anjin(Beijing Institute of Technology,Beijing 100081,China;National Key Laboratory of Science and Technology on Materials under Shock and Impact,Beijing 100081,China;State Key Laboratory of Explosion Science and Technology,Beijing 100081,China)

机构地区：[1]北京理工大学,北京100081 [2]冲击环境材料技术国家级重点实验室,北京100081 [3]爆炸科学与技术国家重点实验室,北京100081

出　　处：《钛工业进展》2021年第6期12-17,共6页Titanium Industry Progress

基　　金：爆炸科学与技术国家重点实验室基金项目(YBKT-17-06)。

摘　　要：通过热处理获得等轴组织、双态组织和魏氏组织的Ti6321合金,研究不同组织的Ti6321合金在动态压缩下的绝热剪切行为。利用分离式霍普金森压杆(SHPB)试验装置对帽形试样进行强迫剪切加载,结合扫描电子显微镜和金相显微镜,对其绝热剪切带和微观组织演化进行观察和分析。结果表明:Ti6321合金的绝热剪切敏感性与其组织密切相关,魏氏组织具有最高的绝热剪切敏感性,等轴组织与双态组织的绝热剪切敏感性接近。随着热处理温度的升高,双态组织的Ti6321合金初生α相含量降低,绝热剪切敏感性增大。冲击速度也会对Ti6321合金的绝热剪切行为产生较大影响,随着冲击速度提高,其绝热剪切敏感性提高。Ti6321 alloy with different microstructures were obtained by different heat treatments,which incluce equiaxed microstructure,bimodal microstructure and widmanstatten microstructure.The adiabatic shear behavior of Ti6321 alloy under dynamic compression was studied.The specimens were subjected to forced shear loading by a split Hopkinson pressure bar(SHPB)test device.The adiabatic shear band and microstructure evolution of the specimens were observed and analyzed by scanning electron microscope and metallographic microscopy.The results show that the adiabatic shear sensitivity of Ti6321 alloy is closely related to the microstructure.Ti6321 alloy with widmanstatten microstructure has the highest adiabatic shear sensitivity,and the adiabatic shear sensitivity of the equiaxed microstructure is close to that of the bimodal microstructure.For the bimodal microstructure,the content of primaryαphase decreases and the adiabatic shear sensitivity increases with the increase of heat treatment temperature.The impact velocity also has a large effect on the adiabatic shear behavior of Ti6321 alloy,and the adiabatic shear sensitivity increases as the impact velocity increases.

关 键 词：钛合金 热处理 微观组织 绝热剪切敏感性 

分 类 号：TG146.23[一般工业技术—材料科学与工程]