CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES |
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Structural phase transition, strength, and texture in vanadium at high pressure under nonhydrostatic compression |
Lun Xiong(熊伦)1,2,3, Jing Liu(刘景)3 |
1 School of Intelligent Manufacturing, Sichuan University of Arts and Science, Dazhou 635000, China; 2 DaZhou Industrial Technology Institute of Intelligent Manufacturing, Dazhou 635000, China; 3 Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China |
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Abstract The structural phase transition, strength, and texture of vanadium have been studied under nonhydrostatic compression up to 70 GPa using an angle-dispersive radial x-ray diffraction technique in a 2-fold paranomic diamond anvil cell and up to 38 GPa using an angle-dispersive x-ray diffraction technique in a modified Mao-Bell diamond anvil cell at room temperature. We have confirmed a phase transition from body-centered cubic structure to rhombohedral structure at 27-32 GPa under nonhydrostatic compression. The radial x-ray diffraction data yields a bulk modulus K0=141(5) GPa and its pressure derivative K'0=5.4(7) for the bcc phase and K0=154(13) GPa with K'0=3.8(3) for the rhombohedral phase at ψ=54.7°. The nonhydrostatic x-ray diffraction data of both bcc and rhombohedral phases yields a bulk modulus K0=188(5) GPa with K'0=2.1(3). Combined with the independent constraints on the high-pressure shear modulus, it is found that the vanadium sample can support a differential stress of ~1.6 GPa when it starts to yield with plastic deformation at ~36 GPa. A maximum differential stress as high as ~1.7 GPa can be supported by vanadium at the pressure of ~47 GPa. In addition, we have investigated the texture up to 70 GPa using the software package MAUD. It is convinced that the body-centered cubic to rhombohedral phase transition and plastic deformation due to stress under high pressures are responsible for the development of texture.
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Received: 29 September 2017
Revised: 23 December 2017
Accepted manuscript online:
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PACS:
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61.05.cp
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(X-ray diffraction)
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62.20.F-
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(Deformation and plasticity)
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07.35.+k
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(High-pressure apparatus; shock tubes; diamond anvil cells)
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64.30.Ef
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(Equations of state of pure metals and alloys)
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Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 10875142 and 11079040) the Project of Sichuan University of Arts and Science, China (Grant No. 2017KZ001Z), and the Program of Education Department of Sichuan Province, China (Grant No. 18ZB0506). This work was performed at 4W2 beamline of Beijing Synchrotron Radiation Facility (BSRF), which was supported by Chinese Academy of Sciences (Grant Nos. KJCX2-SWN03 and KJCX2-SW-N20). |
Corresponding Authors:
Lun Xiong
E-mail: 1094129778@qq.com
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Cite this article:
Lun Xiong(熊伦), Jing Liu(刘景) Structural phase transition, strength, and texture in vanadium at high pressure under nonhydrostatic compression 2018 Chin. Phys. B 27 036101
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