Dynamic stress-strain properties of Ti-Al-V titanium alloys with various element contents
Dynamic stress-strain properties of Ti-Al-V titanium alloys with various element contents
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DOI：
10.1007/s12598-013-0165-3
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发表时间：
2013-12-01
期刊：
影响因子：
8.8
通讯作者：
Song, Xiao-Yun
中科院分区：
文献类型：
--
作者：
Liu, Rui;Hui, Song-Xiao;Song, Xiao-Yun
制备了一系列名义成分为Ti-7Al-5V ELI、Ti-5Al-3V ELI、商业Ti-6Al-4V ELI和商业Ti-6Al-4V的Ti-Al-V钛合金棒材。然后对这些合金进行热处理以获得具有不同含量的初级α相的双峰或等轴显微组织。利用分离式Hopkinson压杆系统研究了上述合金在应变速率为2000 ~ 4000 s（-1）范围内的动态压缩性能。结果表明，等轴初生α（α（p））体积分数为45 vol%或67 vol%的Ti-6Al-4V合金具有良好的动态性能，具有较高的动态强度和能量吸收，同时具有可接受的动态塑性。然而，所有α（p）为65体积%的Ti 53 ELI试样和Ti64 ELI试样在4，000 s（-1）的应变速率下均未断裂。看来未受损的试件仍然具有承载能力。随着Al、V、Fe、O含量的增加，合金的动态强度提高，而动态应变在适当范围内对成分变化不敏感。初生α相体积分数对Ti-Al-V合金动态性能的影响与合金成分有关。
A series of Ti-Al-V titanium alloy bars with nominal composition Ti-7Al-5V ELI, Ti-5Al-3V ELI, commercial Ti-6Al-4V ELI and commercial Ti-6Al-4V were prepared. These alloys were then heat treated to obtain bimodal or equiaxed microstructures with various contents of primary alpha phase. Dynamic compression properties of the alloys above were studied by split Hopkinson pressure bar system at strain rates from 2,000 to 4,000 s(-1). The results show that Ti-6Al-4V alloy with equiaxed primary alpha (alpha(p)) volume fraction of 45 vol% or 67 vol% exhibits good dynamic properties with high dynamic strength and absorbed energy, as well as an acceptable dynamic plasticity. However, all the Ti53ELI specimens and Ti64ELI specimens with alpha(p) of 65 vol% were not fractured at a strain rate of 4,000 s(-1). It appears that the undamaged specimens still have load-bearing capability. Dynamic strength of Ti-Al-V alloy can be improved as the contents of elements Al, V, Fe, and O increase, while dynamic strain is not sensitive to the composition in the appropriate range. The effects of primary alpha volume fraction on the dynamic properties are dependent on the compositions of Ti-Al-V alloys.