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王翘楚,惠松骁,叶文君,刘睿,于洋.一种亚稳型β钛合金在高应变率下的多种变形机制[J].稀有金属材料与工程(英文),2019,48(5):1415~1420.[Wang Qiaochu,Hui Songxiao,Ye Wenjun,Liu Rui and Yu Yang.Multiple deformation mechanisms of a metastable β Ti-V alloy at high strain rates[J].Rare Metal Materials and Engineering,2019,48(5):1415~1420.]
Multiple deformation mechanisms of a metastable β Ti-V alloy at high strain rates
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Received:December 13, 2017  Revised:December 27, 2017
Key words: metastable β titanium alloys  high strain rates  stress induced ω phase transformation  twinning
Foundation item:国家自然科学基金项目(面上项目,重点项目,重大项目)
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Wang Qiaochu,Hui Songxiao,Ye Wenjun,Liu Rui and Yu Yang  
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      In the present work, compressive properties and deformation modes of binary Ti-16V alloy have been investigated during dynamic compressive tests performed on split Hopkinson pressure bar. For metastable Ti-16V alloy, the flow stress and strain hardening rate were both independent of the loading strain rate within the strain rate range (1000~3700 s-1) in our experiments. According to the optical microstructure evolution, the critical instability strain rate was confirmed to be about 3000 s-1. Multiple deformation modes including {332}<113> type mechanical twinning and stress induced ω phase transformation were identified by electron backscatter diffraction and transmission electron microscopy. With the help of Schmid factor values calculated in a spherical coordinate system, the dynamic twinning behavior of Ti-16V alloy was analyzed and the critical Schmid factor was proved to be a key parameter determining the activation of twinning behavior. Combining the critical Schmid factor value and true stress, the critical resolved shear stress range of {332}<113> type twinning was calculated to be 334~338 MPa.