Improving the critical current density of the V0.59Ti0.40Ce0.01 alloy superconductor through successive cold-working and annealing at different temperatures
Abstract
The critical current density (Jc) of V-Ti alloy superconductors is strongly influenced by the size and distribution of microstructural defects that pin magnetic flux lines. In this work, the effect of successive cold working and annealing (SCA) at 550°C on the microstructure, superconducting properties, and flux-pinning behaviour of the V0.59Ti0.40Ce0.01 alloy is investigated and compared with the previously reported SCA at 450 and 650°C. During SCA at 550°C, the superconducting transition temperature increases gradually with successive processing steps. The first annealing after cold rolling to 50% thickness produces a significant enhancement in Jc over the measured field range, whereas subsequent SCA cycles result in only marginal changes. The Jc remains relatively weakly dependent on magnetic field over wide magnetic-field range, and the final cold-worked sample exhibits a finite Jc up to 8.5 T. Pinning force density analysis shows that grain boundaries dominate flux pinning in low magnetic fields, whereas dislocations and β-α' interfaces become the dominant pinning centres in higher fields. Comparison of the different SCA temperatures shows that 650°C provides the highest low-field Jc, whereas 450°C gives the best high-field performance. In contrast, SCA at 550°C provides most balanced field dependence and the largest enhancement in Jc relative to the corresponding as-cast alloy. Although the highest absolute Jc in the high-field regime is achieved after the third SCA cycle at 450°C, a comparable value is obtained after only the first annealing at 550°C. These results demonstrate that the intermediate annealing temperature of 550°C provides an effective balance between defect generation, phase evolution, and recovery, resulting in enhanced flux pinning over a wide magnetic-field range.
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BibTeX
@misc{khandelwal2026improving,
title = {{Improving the critical current density of the $\mathrmV_0.59\mathrmTi_0.40\mathrmCe_0.01$ alloy superconductor through successive cold-working and annealing at different temperatures}},
author = {Asi Khandelwal and SK. Ramjan and Basudev Padhi and L. S. Sharath Chandra and Archna Sagdeo and Kranti Kumar and Sudip Pal and M. K. Chattopadhyay},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.35169},
eprint = {2609.35169},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.35169},
note = {CC BY-NC-ND 4.0},
}
RIS
TY - UNPB
TI - Improving the critical current density of the V_0.59Ti_0.40Ce_0.01 alloy superconductor through successive cold-working and annealing at different temperatures
AU - Asi Khandelwal
AU - SK. Ramjan
AU - Basudev Padhi
AU - L. S. Sharath Chandra
AU - Archna Sagdeo
AU - Kranti Kumar
AU - Sudip Pal
AU - M. K. Chattopadhyay
PY - 2026
DA - 2026/09/28
PB - arXiv
DO - 10.48550/arxiv.2609.35169
UR - https://arxiv.org/abs/2609.35169
AB - The critical current density (J_c) of V-Ti alloy superconductors is strongly influenced by the size and distribution of microstructural defects that pin magnetic flux lines. In this work, the effect of successive cold working and annealing (SCA) at 550°C on the microstructure, superconducting properties, and flux-pinning behaviour of the V_0.59Ti_0.40Ce_0.01 alloy is investigated and compared with the previously reported SCA at 450 and 650°C. During SCA at 550°C, the superconducting transition temperature increases gradually with successive processing steps. The first annealing after cold rolling to 50% thickness produces a significant enhancement in J_c over the measured field range, whereas subsequent SCA cycles result in only marginal changes. The J_c remains relatively weakly dependent on magnetic field over wide magnetic-field range, and the final cold-worked sample exhibits a finite J_c up to 8.5 T. Pinning force density analysis shows that grain boundaries dominate flux pinning in low magnetic fields, whereas dislocations and β-α' interfaces become the dominant pinning centres in higher fields. Comparison of the different SCA temperatures shows that 650°C provides the highest low-field J_c, whereas 450°C gives the best high-field performance. In contrast, SCA at 550°C provides most balanced field dependence and the largest enhancement in J_c relative to the corresponding as-cast alloy. Although the highest absolute J_c in the high-field regime is achieved after the third SCA cycle at 450°C, a comparable value is obtained after only the first annealing at 550°C. These results demonstrate that the intermediate annealing temperature of 550°C provides an effective balance between defect generation, phase evolution, and recovery, resulting in enhanced flux pinning over a wide magnetic-field range.
ER -