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Achieving Superconductivity with Higher Tc in Lightweight Al-Ti-Mg Alloys: Prediction using Machine Learning and Synthesis via High-Pressure Torsion Process
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Kyushu Institute of Technology
Kyushu Institute of Technology
Kyushu Institute of Technology
Kyushu Institute of Technology
Kyushu Institute of Technology
Virginia Polytechnic Institute and State University, Kyushu University
Kyushu Institute of Technology, Kumamoto University, Saga University
抄録
Aluminum (Al) and titanium (Ti) are superconducting materials but their superconducting transition temperatures (Tc) are quite low as 1.20 and 0.39 K, respectively, while magnesium (Mg) never exhibits superconductivity. In this study, we explored new superconductors with higher Tc in the Al–Mg–Ti ternary system, along with the prediction using machine learning. High-pressure torsion (HPT) is utilized to produce the superconducting states. While performing AC magnetization measurements, we found, for the first time, superconducting states with Tc=4.0 and 7.3 K for a composition of Al:Ti = 1:2. The magnetic anomalies appeared more sharply when the sample was processed by HPT at 573 K than at room temperature, and the anomalies exhibited DC magnetic field dependence characteristic of superconductivity. Magnetic anomalies also appeared at ∼55 and ∼93 K, being supported by the prediction using the machine learning for the Al–Ti–O system, and this suggests that Al–Ti oxides play an important role in the advent of such anomalies but that the addition of Mg could be less effective.
雑誌名
Journal of Applied Physics
巻
131
号
10
ページ
105903-1 - 105903-8
発行年
2022-03-11
出版者
AIP Publishing
ISSN
0021-8979
1089-7550
書誌レコードID
AA00693547
DOI
https://doi.org/10.1063/5.0086694
権利
Copyright (c) 2022 Author(s). Published under an exclusive license by AIP Publishing.
Achieving Superconductivity with Higher Tc in Lightweight Al-Ti-Mg Alloys: Prediction using Machine Learning and Synthesis via High-Pressure Torsion Process
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