分离式霍普金森压杆加载下不同组织Ti-6321钛合金的动态响应行为

doi:10.3969/j.issn.1000-1093.2021.04.020

摘要/Abstract

摘要： 通过固溶处理获得不同组织的Ti-6321钛合金，研究组织对材料动态响应行为的影响。采用万能试验机和分离式霍普金森压杆实验装置，结合光学显微镜和扫描电子显微镜等表征方法，对加载后的钛合金试样微观组织演化进行观察分析。结果表明：等轴、双态和魏氏组织材料均具有明显的应变率强化效应，临界剪切断裂应变率为3 000 s^-1，双态组织具有较好的静态、动态强塑性匹配，魏氏组织较差，等轴组织具有较高的临界剪切应变和冲击吸收功，分别为0.252和307 MJ/m³；应变率3 000 s^-1下，等轴组织的应变率敏感因子随应变的增加逐渐增大，魏氏组织相反，双态组织基本不变；应变为5%时，等轴和双态组织的应变率敏感因子随应变率的增加而增大，魏氏组织基本不变；3种组织均发生绝热剪切失效，等轴组织绝热剪切敏感性较低，魏氏组织绝热剪切敏感性较高。

关键词: Ti-6321钛合金, 动态响应行为, 分离式霍普金森压杆, 应变率敏感性, 绝热剪切敏感性

Abstract: Ti-6321 titanium alloys with different microstructures were obtained through solution treatment, and the influence of microstructure on the dynamic behavior of materials was studied. An universal testing machine and a split Hopkinson pressure bar test device, combined with the characterization methods such as optical microscope and scanning electron microscope, were used to characterize the microstructure evolution of loaded titanium alloy sample. The results demonstrate that the alloys with equiaxed, bimodal and Widmanstatten microstructures have obvious strain rate strengthening effect, and the critical shear fracture strain rates are all 3 000 s^-1. The bimodal structure has good strength and plastic combination under static and dynamic compression, Widmanstatten structure is poor, and the equiaxed structure has higher critical shear strain and impact absorption energy, which are 0.252 and 307 MJ·m^-3 , respectively. At the strain rate of 3 000 s^-1, the strain rate sensitivity factor of the equiaxed microstructure increases gradually, the strain rate sensitivity factor of Widmanstatten microstructure decreases, and the strain rate sensitivity factor of bimodal microstructure is unchanged with the increase in strain. When the strain is 5%, the strain rate sensitivity factors of equiaxed and bimodal microstructures increase with the increase in the strain rate, while the strain rate sensitivity factor of Widmanstatten microstrucutre is unchanged. Adiabatic shear failure occurs in all microstructures. Equiaxed structure has a low adiabatic shear sensitivity, and Widmanstatten structure has a high adiabatic shear sensitivity.

Key words: Ti-6321titaniumalloy, dynamicresponsebehavior, splitHopkinsonpressurebar, strainratesensitivity, adiabaticshearsensitivity

中图分类号:

TG146.23

宁子轩，王琳，程兴旺，程焕武，刘安晋，徐雪峰，周哲，张斌斌. 分离式霍普金森压杆加载下不同组织Ti-6321钛合金的动态响应行为[J]. 兵工学报, 2021, 42(4): 862-870.

NING Zixuan, WANG Lin, CHENG Xingwang, CHENG Huanwu, LIU Anjin, XU Xuefeng, ZHOU Zhe, ZHANG Binbin. Dynamic Response Behaviors of Ti-6321 Titanium Alloys with Different Microstructures under Split Hopkinson Pressure BarLoading[J]. Acta Armamentarii, 2021, 42(4): 862-870.

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