微量B对铸态Ti-6Al-4V合金动态压缩性能的影响  

Effect of trace boron on dynamic compressive properties of as-cast Ti-6Al-4V alloy

作　　者：于洋[1] 惠松骁[1] 叶文君[1] 宋晓云[1] 刘睿[1] 付艳艳[1] 熊柏青[1] 

机构地区：[1]北京有色金属研究总院有色金属材料制备加工国家重点实验室,北京100088

出　　处：《金属热处理》2012年第6期32-35,共4页Heat Treatment of Metals

基　　金：科技部国际科技合作项目(2010DFA52280)

摘　　要：采用霍普金森压杆(SHPB)研究了添加0.1%B对铸态Ti-6Al-4V合金的动态压缩性能的影响,并对在高应变速率下的损伤机制进行分析。结果表明,添加0.1%B可细化铸态组织,减轻由于变形不协调造成的应力、应变不均匀性和局部的应力集中。同时随材料绝热剪切敏感性的降低,提高了均匀动态塑性应变和平均动态流变应力。在高速冲击载荷作用下,合金表现为绝热剪切失效,TiB相在断裂过程中承担载荷,材料断面有1μm左右的不连续分布熔融组织,这与应变局域化有关。Effect of 0. 1% boron addition on dynamic compression properties of as cast Ti-6A1-4V alloy is investigated by Split Hopkinson Pressure Bar （ SHPB）, and relative damage mechanism is also analyzed. The results show that as-cast microstructure is refined due to 0. 1% boron addition and also lower the non-uniform distribution of strain, stress or local concentration and due to inharmonic deformation. And the same time dynamic strain and average dynamic flow stress are improved with adiabatic shear sensitivity reduction. At high speed impact load, the alloy exhibits adiabatic shear damage and TiB phases bear loading during fracture. There are the discontinously distributed with diameter of about 1μm molten structures on material section, which are decomposed due to strain localizing.

关 键 词：铸态Ti-6Al-4V合金 B 绝热剪切敏感性 动态压缩性 

分 类 号：TG113.25[金属学及工艺—物理冶金]