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Featured researches published by Ye Tan.


Journal of Applied Physics | 2012

Sound velocity measurements of tantalum under shock compression in the 10-110 GPa range

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

Phase transition and strength of vanadium under shock compression up to 88 GPa

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

Hugoniot and sound velocity measurements of bismuth in the range of 11–70 GPa

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

Sound velocity of tantalum under shock compression in the 18–142 GPa range

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

The α-γ-ε triple point and phase boundaries of iron under shock compression

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

Solid phase stability of molybdenum under compression: Sound velocity measurements and first-principles calculations

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

Research on phase transition and strength under ramp compression with graded density impactor

Ye Tan; Xuemei Li; Yuying Yu; Ke Jin


Bulletin of the American Physical Society | 2013

Versatile target assembly of explosive loading experiments for measuring sound velocity under high pressure: copper and bismuth as examples

Ke Jin; Feng Xi; Ye Tan; Jun Li; Chengda Dai


Bulletin of the American Physical Society | 2013

No solid-solid phase transition in Mo before melting: experiment and theory

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

The compressibility and sound velocity measurements of molybdenum up to

Chengda Dai; Xiang Wang; Xiu-Lu Zhang; Qingsong Wang; Ke Jin; Ye Tan; Hongxing Song; Feng Xi; Jianbo Hu; Hua Tan

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Chengda Dai

Chinese Academy of Engineering

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Ke Jin

Chinese Academy of Engineering

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Yuying Yu

Chinese Academy of Engineering

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Feng Xi

Chinese Academy of Engineering

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Hua Tan

Chinese Academy of Engineering

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Jianbo Hu

Chinese Academy of Engineering

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Ling-Cang Cai

Chinese Academy of Engineering

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Qiang Wu

Chinese Academy of Engineering

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Qingsong Wang

Wuhan University of Technology

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Xiu-Lu Zhang

Southwest University of Science and Technology

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