Fine structure of a bulk Mg[B.sub.2] superconductor alter deformation and heat treatment

Fine structure of a bulk Mg[B.sub.2] superconductor alter deformation and heat treatment

The structure of the Mg[B.sub.2] superconductor subjected to high-temperature restoration annealing after cold deformation under high pressure in a Toroid chamber or Bridgman anvils has been investigated by transmission electron microscopy. It has been shown that after postdeformation annealing at 9...

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Bibliographic Details
Published in:Physics of metals and metallography Vol. 118; no. 4; p. 346
Main Authors: Kuznetsova, E.I, Krinitsina, T.P, Blinova, Yu.V, Degtyarev, M.V, Sudareva, S.V
Format: Journal Article
Language:English
Published: Springer 01-04-2017
Subjects:
Annealing
Comparative analysis
Electron microscopy
Magnesium compounds
Superconductors
Online Access:Get full text
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Summary:The structure of the Mg[B.sub.2] superconductor subjected to high-temperature restoration annealing after cold deformation under high pressure in a Toroid chamber or Bridgman anvils has been investigated by transmission electron microscopy. It has been shown that after postdeformation annealing at 950[degrees]C the average size of crystallites in the matrix phase increases 5-10 times compared to the deformed state, reaching ~50-150 nm, as well as the critical current density increases by a factor of three (up to 6.7 x [10.sup.4] A/[cm.sup.2], 30 K) compared to the initial state. It has been found that the MgO phase and the higher magnesium borides are present in the form of dispersed precipitates 10-70 nm in size. Keywords: magnesium diboride, deformation, annealing
ISSN:0031-918X
DOI:10.1134/S0031918X1704007X