(W+TiB+TiC)/TA15复合材料的动态力学性能及绝热剪切行为  

Dynamic mechanical properties and adiabatic shearing behavior of(W+TiB+TiC)/TA15 titanium matrix composite

作　　者：孙守伟 马逸飞 任宇[1] SUN Shouwei;MA Yifei;REN Yu(School of Energy,Power and Mechanical Engineering,North China Electric Power University,Beijing 102206,China)

机构地区：[1]华北电力大学能源动力与机械工程学院,北京102206

出　　处：《兵器装备工程学报》2025年第2期244-250,共7页Journal of Ordnance Equipment Engineering

基　　金：中国博士后科学基金面上项目(2021M690012)。

摘　　要：钛基复合材料(TMC)在涉及冲击载荷服役条件的武器装备领域具有广阔的应用前景。为揭示新型“难熔金属+陶瓷”杂化增强TMC的高应变率加载响应特性及失效行为,通过原位合成反应成功制备了(W+TiB+TiC)/TA15杂化增强TMC,并利用材料万能试验机和分离式Hopkinson压杆测试了该TMC在0.001~4 000/s应变率范围内的室温压缩力学性能,同时对高应变率加载后TMC的微观组织进行了系统表征。结果表明:准静态及动态压缩时,杂化增强TMC的强度和塑性均高于作为基体的均质TA15合金;4 000/s应变率时,TMC的平均流变应力、均匀塑性应变和冲击吸收能分别达到1632 MPa、27%和449 J/cm^(3),较均质TA15合金分别提高了9.8%、8.0%和20.7%;杂化增强相团簇的存在显著影响TMC中绝热剪切带(ABS)的扩展和交互作用行为,导致ASB更容易发生偏转、分叉和汇聚,有效耗散了高应变率加载过程中的冲击能量,使TMC表现出了更优异的动态力学性能。Titanium matrix composites(TMC)have broad application prospects in the field of weapons involving impact load service conditions.To reveal the high-strain-rate loading response characteristics and failure behavior of a novel“refractory metal+ceramic”hybrid reinforced TMC,(W+TiB+TiC)/TA15 TMC was firstly prepared through in-situ synthesis reaction.Then,the compression mechanical properties of this TMC at room temperature and with the strain rate range of 0.001~4000/s were tested using a universal testing machine and a split Hopkinson pressure bar.The microstructures of TMC after high-strain-rate loading were also systematically investigated.The results show that both strength and plasticity of hybrid reinforced TMC are higher than those of homogeneous TA15 alloy when compressed quasi-statically and dynamically.At the strain rate of 4000/s,the average flow stress,uniform plastic strain,and impact absorption energy of the hybrid-reinforced TMCs are 1632 MPa,27%and 449 J/cm 3,and compared with homogeneous TA15 alloy,increased by 9.8%,8.0%,and 20.7%,respectively.The presence of hybrid reinforcing phase clusters significantly affects the propagation and interaction of adiabatic shear bands(ASBs)in TMC,making ASBs more prone to deflection,bifurcation and convergence,effectively dissipating the impact energy during high-strain-rate loading,and enabling TMC to exhibit better dynamic mechanical performance.

关 键 词：钛基复合材料 杂化增强相 原位合成 力学行为 高应变率 绝热剪切带 

分 类 号：TG146.23[一般工业技术—材料科学与工程]