Experimental study on the dynamic mechanical properties of titanium alloy after thermal oxidation
Experimental study on the dynamic mechanical properties of titanium alloy after thermal oxidation
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钛合金热氧化后动态力学性能实验研究
DOI：
10.1007/s00339-016-0126-4
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发表时间：
2016
影响因子：
2.7
通讯作者：
Liangbiao Chen
中科院分区：
文献类型：
--
作者：
Xiaoyan Niu;Yingjie Yu;Lianhua Ma;Liangbiao Chen
采用分离式霍普金森压杆，研究了热氧化TC4 （Ti-6Al-4V）钛合金的动态压缩性能。在400 ~ 2000 s-1的多种应变速率和25 ~ 200℃的不同试验温度下进行了动态试验。给出了热氧化TC4钛合金的真应力-应变曲线数据。结果表明，热氧化提高了TC4钛合金的动态抗压强度和应变硬化速率。采用较高的应变率可获得较高的材料抗压强度。在应变速率为2000 s-1时，TC4钛合金的应力-应变曲线表现为应变速率硬化行为和热软化行为。氧化温度对TC4钛合金动态性能影响不大，但选择不同的氧化保温时间可显著影响塑性变形的起始，从而有可能提高处理材料的延展性。此外，数据表明，测试温度的升高导致处理材料的屈服应力大大降低
In this study, the dynamic compressive properties of thermally oxidized TC4 (Ti–6Al–4V) titanium alloys were studied with split Hopkinson pressure bar. The dynamic tests were conducted under multiple strain rates from 400 to 2000 s-1 and different testing temperatures from 25 to 200oC. Data for the true stress–strain curves of thermally oxidized TC4 titaniumalloy are presented. They show that the thermal oxidation increases both the dynamic compressive strength of TC4 titanium and the rate of strain hardening. Higher compressive strengths of the material were obtained by applying higher strain rates. Under a strain rate of 2000 s-1, the stress–strain curves of TC4 titanium alloys exhibit both strain-rate-hardening behavior and thermal softening behavior. The oxidation temperature has little effect on dynamic properties of TC4 titanium alloy, but choosing different holding time for oxidation could greatly affect the initiation of plastic deformation and thus might potentially improve the ductility of the treated material. Furthermore, the data show that the increase in the testing temperature results in much lower yield stresses of the treated material