Ye Tan
Chinese Academy of Engineering
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Publication
Featured researches published by Ye Tan.
Journal of Applied Physics | 2012
Jianbo Hu; Chengda Dai; Yuying Yu; Zi-Jiang Liu; Ye Tan; Xianming Zhou; Hua Tan; Ling-Cang Cai; Qiang Wu
The high-pressure melting curve of tantalum (Ta) has been the center of a long-standing controversy. Sound velocities along the Hugoniot curve are expected to help in understanding this issue. To that end, we employed a direct-reverse impact technique and velocity interferometry to determine sound velocities of Ta under shock compression in the 10-110 GPa pressure range. The measured longitudinal sound velocities show an obvious kink at ∼60 GPa as a function of shock pressure, while the bulk sound velocities show no discontinuity. Such observation could result from a structural transformation associated with a negligible volume change or an electronic topological transition.
Applied Physics Letters | 2014
Yuying Yu; Ye Tan; Chengda Dai; Xuemei Li; Yinghua Li; Qiang Wu; Hua Tan
A series of reverse-impact experiments were performed on vanadium at shock pressure ranging from 32 GPa to 88 GPa. Particle velocity profiles measured at sample/LiF window interface were used to estimate the sound velocities, shear modulus, and yield stress in shocked vanadium. A phase transition at ∼60.5 GPa that may be the body-centered cubic (BCC) to rhombohedral structure was identified by the discontinuity of the sound velocity against shock pressure. This transition pressure is consistent with the results from diamond anvil cell (DAC) experiments and first-principle calculations. However, present results show that the rhombohedral phase has higher strength and shear modulus than the BCC phase, which is contrast to the findings from DAC experiments and theoretical work.
Journal of Applied Physics | 2013
Ye Tan; Yuying Yu; Chengda Dai; Ke Jin; Qingsong Wang; Jianbo Hu; Hua Tan
Plate impact experiments in backward-impact geometry were performed on bismuth (Bi) in the pressure range of 11–70 GPa. The bismuth sample used as flyer impacted a LiF window, and the impact velocity and particle velocity at interface were simultaneously measured by a distance interferometer system for any reflector. Hugoniot and sound velocity data were extracted from the observed particle velocity profiles. The obtained plot of shock velocity (D) versus particle velocity (u) showed a discontinuity at u ≈ 0.9 km/s, corresponding to a pressure of ∼27 GPa. Furthermore, plate impact experiments in forward-impact geometry were conducted to measure sound velocities of bismuth. The extracted sound velocity data from backward and forward-impact experiments showed a transition from longitudinal to bulk sound velocity (18 GPa–27 GPa), and the pressure of transition to bulk sound velocity is consistent with the pressure of D-u knee at u ≈ 0.9 km/s. This D-u discontinuity at u ≈ 0.9 km/s is attributed to shock indu...
Journal of Applied Physics | 2015
Feng Xi; Ke Jin; Ling-Cang Cai; Huayun Geng; Ye Tan; Jun Li
Dynamic compression experiments of tantalum (Ta) within a shock pressure range from 18–142 GPa were conducted driven by explosive, a two-stage light gas gun, and a powder gun, respectively. The time-resolved Ta/LiF (lithium fluoride) interface velocity profiles were recorded with a displacement interferometer system for any reflector. Sound velocities of Ta were obtained from the peak state time duration measurements with the step-sample technique and the direct-reverse impact technique. The uncertainty of measured sound velocities were analyzed carefully, which suggests that the symmetrical impact method with step-samples is more accurate for sound velocity measurement, and the most important parameter in this type experiment is the accurate sample/window particle velocity profile, especially the accurate peak state time duration. From these carefully analyzed sound velocity data, no evidence of a phase transition was found up to the shock melting pressure of Ta.
Journal of Applied Physics | 2017
Jun Li; Qiang Wu; Tao Xue; Huayun Geng; Jidong Yu; Ke Jin; Jiabo Li; Ye Tan; Feng Xi
The phase transition of iron under shock compression has attracted much attention in recent decades because of its importance in fields such as condensed matter physics, geophysics, and metallurgy. At room temperature, the transition of iron from the α-phase (bcc) to the e-phase (hpc) occurs at a stress of 13 GPa. At high temperature, a triple point followed by transformation to the γ-phase (fcc) is expected. However, the details of the high-temperature phase transitions of iron are still under debate. Here, we investigate the phase-transition behavior of polycrystalline iron under compression from room temperature to 820 K. The results show that the shock-induced phase transition is determined unequivocally from the measured three-wave-structure profiles, which clearly consist of an elastic wave, a plastic wave, and a phase-transition wave. The phase transition is temperature-dependent, with an average rate Δσtr/ΔT of −6.91 MPa/K below 700 K and −34.7 MPa/K at higher temperatures. The shock α-e and α-γ p...
Journal of Applied Physics | 2015
Xiu-Lu Zhang; Zhong-Li Liu; Ke Jin; Feng Xi; Yuying Yu; Ye Tan; Chengda Dai; Ling-Cang Cai
The high-pressure solid phase stability of molybdenum (Mo) has been the center of a long-standing controversy on its high-pressure melting. In this work, experimental and theoretical researches have been conducted to check its solid phase stability under compression. First, we performed sound velocity measurements from 38 to 160 GPa using the two-stage light gas gun and explosive loading in backward- and forward-impact geometries, along with the high-precision velocity interferometry. From the sound velocities, we found no solid-solid phase transition in Mo before shock melting, which does not support the previous solid-solid phase transition conclusion inferred from the sharp drops of the longitudinal sound velocity [Hixson et al., Phys. Rev. Lett. 62, 637 (1989)]. Then, we searched its structures globally using the multi-algorithm collaborative crystal structure prediction technique combined with the density functional theory. By comparing the enthalpies of body centered cubic structure with those of the metastable structures, we found that bcc is the most stable structure in the range of 0–300 GPa. The present theoretical results together with previous ones greatly support our experimental conclusions.
EPJ Web of Conferences | 2018
Ye Tan; Xuemei Li; Yuying Yu; Ke Jin
Bulletin of the American Physical Society | 2013
Ke Jin; Feng Xi; Ye Tan; Jun Li; Chengda Dai
Bulletin of the American Physical Society | 2013
Xiu-Lu Zhang; Zhong-Li Liu; Ke Jin; Feng Xi; Yuying Yu; Ye Tan; Chengda Dai; Ling-Cang Cai
Bulletin of the American Physical Society | 2013
Chengda Dai; Xiang Wang; Xiu-Lu Zhang; Qingsong Wang; Ke Jin; Ye Tan; Hongxing Song; Feng Xi; Jianbo Hu; Hua Tan