skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Structural and phase transformations in zinc and brass wires under heating with high-density current pulse

Abstract

The work is focused on revealing the mechanism of structure and phase transformations in the metal wires under heating with a high-density current pulse (the electric explosion of wires, EEWs). It has been demonstrated on the example of brass and zinc wires that the transition of a current pulse with the density of j ≈ 3.3 × 10{sup 7} A/cm{sup 2} results in homogeneous heating of the crystalline structure of the metal/alloy. It has been determined that under heating with a pulse of high-density current pulse, the electric resistance of the liquid phases of zinc and brass decreases as the temperature increases. The results obtained allow for a conclusion that the presence of the particles of the condensed phase in the expanding products of EEW is the result of overheating instabilities in the liquid metal.

Authors:
 [1]
  1. Laboratory of Physical Chemistry of Ultrafine Materials, Institute of Strength Physics and Materials Science, 2/4, pr. Akademicheskii, 634021 Tomsk, Russia and Department of High Voltage Electrophysics and High Current Electronics, Tomsk Polytechnic University, 30 Lenin Avenue, 634050 Tomsk (Russian Federation)
Publication Date:
OSTI Identifier:
22598963
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physics of Plasmas; Journal Volume: 23; Journal Issue: 6; Other Information: (c) 2016 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; BRASS; CURRENT DENSITY; DENSITY; EXPLOSIONS; HEATING; INSTABILITY; LIQUID METALS; PARTICLES; PHASE TRANSFORMATIONS; PULSES; WIRES; ZINC

Citation Formats

Pervikov, A. V. Structural and phase transformations in zinc and brass wires under heating with high-density current pulse. United States: N. p., 2016. Web. doi:10.1063/1.4953418.
Pervikov, A. V. Structural and phase transformations in zinc and brass wires under heating with high-density current pulse. United States. doi:10.1063/1.4953418.
Pervikov, A. V. 2016. "Structural and phase transformations in zinc and brass wires under heating with high-density current pulse". United States. doi:10.1063/1.4953418.
@article{osti_22598963,
title = {Structural and phase transformations in zinc and brass wires under heating with high-density current pulse},
author = {Pervikov, A. V.},
abstractNote = {The work is focused on revealing the mechanism of structure and phase transformations in the metal wires under heating with a high-density current pulse (the electric explosion of wires, EEWs). It has been demonstrated on the example of brass and zinc wires that the transition of a current pulse with the density of j ≈ 3.3 × 10{sup 7} A/cm{sup 2} results in homogeneous heating of the crystalline structure of the metal/alloy. It has been determined that under heating with a pulse of high-density current pulse, the electric resistance of the liquid phases of zinc and brass decreases as the temperature increases. The results obtained allow for a conclusion that the presence of the particles of the condensed phase in the expanding products of EEW is the result of overheating instabilities in the liquid metal.},
doi = {10.1063/1.4953418},
journal = {Physics of Plasmas},
number = 6,
volume = 23,
place = {United States},
year = 2016,
month = 6
}
  • The phase transitions in crystalline and amorphous porous silicon layers on silicon single crystal under isothermal or laser pulse nanosecond heating were modeled. The pulse heating was described as an adiabatic process by using a quasi-statistical approximation through homogeneous nucleation and growth of a new phase. The calculation of the free energy of porous silicon for cylindrical, spherical, and complex structures of the pores and its dependence on the pore radius, overall porosity, and thermoelastic stresses was made. The equilibrium free energy increased to 0.15 and 0.09 eV, with a corresponding decrease in melting temperature of 400 and 300 Kmore » for crystalline and amorphous porous silicon, respectively. The Laplace pressure retards this shift no more than 10 K. The possibility of epitaxial silicon layer formation (0.1 to 1.2 {micro}m thick) on porous silicon after pulse heating (30 ns; beam density from 2 to 10 kJ {center{underscore}dot} m{sup {minus}2}) is shown.« less
  • Here, we report comprehensive studies on the high-pressure structural and electrical transport properties of the layered transition metal chalcogenide (Cr 2S 3) up to 36.3 GPa. A structural phase transition was observed in the rhombohedral Cr 2S 3 near 16.5 GPa by the synchrotron angle dispersive X-ray diffraction measurement using a diamond anvil cell. Through in situ resistance measurement, the electric resistance value was detected to decrease by an order of three over the pressure range of 7–15 GPa coincided with the structural phase transition. Measurements on the temperature dependence of resistivity indicate that it is a semiconductor-to-metal transition inmore » nature. The results were also confirmed by the electronic energy band calculations. Above results may shed a light on optimizing the performance of Cr 2S 3 based applications under extreme conditions.« less
  • Here, we report comprehensive studies on the high-pressure structural and electrical transport properties of the layered transition metal chalcogenide (Cr{sub 2}S{sub 3}) up to 36.3 GPa. A structural phase transition was observed in the rhombohedral Cr{sub 2}S{sub 3} near 16.5 GPa by the synchrotron angle dispersive X-ray diffraction measurement using a diamond anvil cell. Through in situ resistance measurement, the electric resistance value was detected to decrease by an order of three over the pressure range of 7–15 GPa coincided with the structural phase transition. Measurements on the temperature dependence of resistivity indicate that it is a semiconductor-to-metal transition in nature. The resultsmore » were also confirmed by the electronic energy band calculations. Above results may shed a light on optimizing the performance of Cr{sub 2}S{sub 3} based applications under extreme conditions.« less
  • An important problem in the design and operation of HVDC transmission lines is to reduce electrical field effects such as ion flow electrification of objects, electric field, ion current and ion density at ground level in the vicinity of HVDC lines. Several models of shield wire were tested with the Shiobara HVDC test line. The models contain typical stranded wires that are generally used to reduce field effects at ground level, neutral conductors placed at lower parts of the DC line, and an ''earth corona model'' to cancel positive or negative ions intentionally by generating ions having opposite polarity tomore » ions flowing into the wire. This report describes the experimental results of the effects of these shield wires and a method to predict shielding effects.« less
  • The critical current densities J{sub c} of Chevrel phase wires with niobium as an antidiffusion barrier were measured in magnetic fields up to 24 T. At 20 T and 1.9 K, J{sub c} reaches 5.4{times}10{sup 8} A/m{sup 2} and decreases slightly down to 3.1{times}10{sup 8} A/m{sup 2} at 24 T. A wire with a 20{percent} superconducting cross section has been successfully drawn and its overall critical current density J{sub c}{sup ov} exceeds 100 A/mm{sup 2} at 1.9 K up to a magnetic field slightly above 20 T. This demonstrates the ability of Chevrel phase wires to be used in highmore » magnetic field applications. Moreover, some parts of the coil have certainly higher J{sub c}, since J{sub c} is very often limited by a thermal excursion of the entire coil. The effective upper critical field {mu}{sub 0}H{sub c2}{sup {asterisk}}, deduced from the magnetic field dependence of J{sub c}, is too low compared to the expected bulk value, indicating that superconducting properties at the grain boundaries are still degraded. If the bulk {mu}{sub 0}H{sub c2} can be restored at the grain surfaces, J{sub c}{sup ov} should be higher than 100 A/mm{sup 2} up to at least 30 T. {copyright} {ital 1997 American Institute of Physics.}« less