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Microstructure and Superconducting Properties of Rapid Heating, Quenching, and Transformation (RHQT) Powder‐in‐Tube Nb 3 Al Wires Doped with Sn Element
Author(s) -
Hu Yuanbin,
Ran Mingming,
Chen Ming,
Yu Xuan,
Liu Lian,
Chen Yongliang,
Zhang Yong,
Yu Zhou,
Zhao Yong
Publication year - 2021
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.202100081
Subject(s) - materials science , superconductivity , microstructure , doping , quenching (fluorescence) , phase (matter) , stoichiometry , flux pinning , analytical chemistry (journal) , condensed matter physics , metallurgy , critical current , chemistry , physics , optoelectronics , organic chemistry , quantum mechanics , chromatography , fluorescence
Properties of rapid heating, quenching, and transformation (RHQT)‐treated powder‐in‐tube (PIT) Nb 3 Al 1− x Sn x wires are studied herein. After the RHQ process, the body‐centered cubic (bcc) phase is formed in the Sn‐doped Nb 3 Al wires. The transformed superconducting A15 phase shows a uniform microstructure and homogenous component distribution feature. With the increase of the Sn doping level, the critical transition temperature ( T c ), critical current density ( J c ), and irreversibility field ( B irr ) of the superconducting wires increase first and then reduce, achieving the highest T c value of 17.6 K and the smallest Δ T c of 0.6 K in the 4% Sn doped Nb 3 Al wire. The 4% Sn addition helps to improve the layer J c of the sample to 2.1 × 10 5 A cm −2 at 8 K and 5 T, which is about 2.5 times that of the pure Nb 3 Al sample. Furthermore, the Nb 3 Al 1− x Sn x ( x = 0.04) wire gives the highest B irr value of 17.22, 13.23, and 9.11 T at 8, 10, and 12 K, respectively. The addition of Sn helps to achieve stoichiometric Nb 3 Al A15 phase and formation of precipitations with the size of 10 nm, which might act as the flux‐pinning center.