α+β钛合金在高应变率下的动态力学性能  

Dynamic Mechanical Behavior of α+β Titanium Alloys at High Strain Rate

作　　者：陈洋 裴传虎[2] 李臻熙[2] 高帆[2] 李四清[2] 

机构地区：[1]海军装备部驻重庆地区军事代表局,重庆402760 [2]北京航空材料研究院,北京100095

出　　处：《航空材料学报》2013年第6期8-12,共5页Journal of Aeronautical Materials

摘　　要：研究四种α+β钛合金在3000s-1应变率下的动态力学性能,并对比分析四种材料的绝热剪切敏感性、绝热剪切带形貌及高应变率下的吸收能。结果表明:四种钛合金在此应变率下均发生了局域化变形,TC17和TC6钛合金的绝热剪切敏感性比TC4和TC11钛合金小。TC17钛合金的晶粒均匀细小且初生α相的等轴化程度很好,因此其在动态加载过程的协调变形能力最强,在此应变率下未萌生绝热剪切带,且动态应变、流变应力和吸收能均较大,抗动态冲击的能力最强。TC6钛合金的绝热剪切带刚刚萌生,并未扩展为裂纹,抗动态冲击的能力较强。TC11和TC4钛合金在此应变率下绝热剪切带已扩展为裂纹,发生了明显的绝热剪切失效,且动态应变和吸收能较小,抗动态冲击的能力较差。The dynamic mechanical property,adiabatic shear susceptibility,adiabatic shear band and absorbed energy of 4 kinds of α ＋ β titanium alloys,i.e.,TC4,TC6,TC11 and TC17,at 3000s-1 strain rate,were investigated.The results show that the adiabatic shear susceptibility of TC17 and TC6 titanium alloys is lower than that of TC4 and TC11 titanium alloys,although the local area deformation occurs for all 4 kinds of alloys.The harmonious deformation ability of TC17 is the best of all due to its fine and uniform primary α phase.Therefore,the adiabatic shear band is not observed in TC17.The flow stress,dynamic plastic strain and absorbed energy of TC17 are also higher than those of other 3 titanium alloys apparently.The adiabatic shear band of TC6 is created but not extended yet.However,the adiabatic shear band of TC4 and TC11 is extended to obvious cracks and these 2 kinds of alloys suffer adiabatic shear fracture.Therefore,the resisting impact ability of TC6 is much better than that of TC4 and TC11.

关 键 词：α+β钛合金 动态力学性能 绝热剪切敏感性 

分 类 号：V252.2[一般工业技术—材料科学与工程]