Effect of deformation-thermal processing using equal-channel multiangle pressing and low-temperature drawing on the superconducting properties of niobium-titanium alloys

Белошенко, В. А.; Dmitrenko, V. Yu.; Chishko, V. V.; Sokolenko, V. I.; Volchok, O. I.

doi:10.1063/1.4894322

Cited by 2 publications

(1 citation statement)

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“…Based on this background, various studies have been conducted to improve the critical current density of the NbTi superconducting wire by changing its initial microstructure [10][11][12]. Beloshenko et al [13,14] presented an enhancement of superconducting properties using equal channel multi-angle pressing (ECMAP). By combining ECMAP and low temperature drawing, critical current density was enhanced by about 20%.…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Correlation between Initial Microstructure and Critical Current Density of Nb-46.5 wt%Ti Superconducting Material

Moon

Kim

Lee

et al. 2021

Metals

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We have investigated the effect of initial microstructures on the change in critical current density (Jc) of Nb-46.5 wt%Ti (NbTi) superconducting material. It is well known that α-Ti phases distributed in NbTi material act as a flux pinning center, resulting in an improvement in critical current density. Therefore, it is crucial to obtain the grain-refined microstructure, which is strongly related with precipitation of uniformly distributed fine α-Ti phases and higher volume faction of α-Ti phases, as α-Ti phases are precipitated at the grain boundaries and triple points during heat treatments. Therefore, in order to characterize the effect of initial microstructure of NbTi on critical current density, different initial microstructures were obtained by applying equal channel angular pressing (ECAP) and hot rolling with different strains. It was revealed experimentally that hot rolling with a higher strain is efficient for obtaining the initial microstructure, which has equiaxed fine grains of β-NbTi with the aid of dynamic recrystallization, and which is helpful for precipitating fine α-Ti phases during intermediate heat treatment. Furthermore, it was confirmed that critical current density can be enhanced by obtaining a smaller α-Ti phase, a higher aspect ratio of α-Ti phase, a higher volume fraction of α-Ti phase and a ribbon-like folded α-Ti phase.

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