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Improved critical current density of Cu-doped Nb3Al wire through optimized Rapid-Heating Quenching and Transformation method by Guowei Li; Junsong Luo; Xuan Yu; Mingming Ran; Pengshuai Qu; Lian Liu; Zhou Yu; Yong Zhao; Yong Zhang is a Engineering article available to read on EtoBox.
What is Improved critical current density of Cu-doped Nb3Al wire through optimized Rapid-Heating Quenching and Transformation method about?
We have prepared 2.5% Cu-doped Nb 3 Al wire by the Rapid-Heating Quenching and Transformation (RHQT) method with optimized annealing. XRD results show that A15 and supersaturated bcc phase are formed after high current RHQ process, and the supersaturated bcc phase is transformed into A15 phase after conventional annealing (800 • C\10 h). We observed the microstructures at different annealing time by field-emission scanning electronic microscope (FESEM) and found that σ phase is generated from the decomposition of the metastable A15 phase after prolonged annealing due to its lower free energy at 800 • C, and gradually accumulates Cu to form the Cu-rich σ phase after 20 h. The low-field superconducting properties were also given through magnetic measurement. Both T c and B c2 decreased slightly along with the increase of σ phase volume when the annealing is prolonged, while J c reached its peak after 20 h\800 • C annealing, which were 1836 A/mm 2 at 4.2 K and 5 T and 822 A/mm 2 at 8 K and 5 T for 800 • C\20 h annealing, about 34% and 36% higher than that of the conventional transformed sample, respectively. The calculated F pmax of the samples with optimized annealing condition also
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- Author
- Guowei Li; Junsong Luo; Xuan Yu; Mingming Ran; Pengshuai Qu; Lian Liu; Zhou Yu; Yong Zhao; Yong Zhang
- Publisher
- Elsevier BV
- Published
- 2022
- Language
- EN
- Field
- Engineering (Physical Sciences)