| Autor: |
Kuznetsova, E. I., Krinitsina, T. P., Blinova, Yu. V., Degtyarev, M. V., Konovalov, P. V., Dikhtiyevskaya, K. K., Abdyukhanov, I. M., Tsapleva, A. S. |
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| Zdroj: |
Physics of Metals & Metallography; Aug2024, Vol. 125 Issue 8, p878-886, 9p |
| Abstrakt: |
The microstructure of the MgB2 core of the single fiber composite consisting of MgB2, the Nb barrier, and the Cu shell (MgB2/Nb,Cu), which is synthesized by the powder-in-tube method with an ex situ option and by subsequent annealing, has been studied. It is shown that a dislocation microstructure that exhibits high thermal stability is formed in the MgB2 core during cold deformation, in addition to powder compaction. A high dislocation density is observed inside MgB2 grains. Dislocations form walls with low misorientation angles between subgrains. Annealing at a temperature of 900°C for 1 h leads to a higher density of MgB2 ceramics, and the intergranular contact area increases. Moreover, MgO inclusions with a size of 10 nm or less are formed. Thus, various kinds of structural defects are formed, which can be considered as probable pinning centers for the magnetic flux. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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