Abstract
The high-entropy alloy(HEA)superconductor,Ta1/6Nb2/6Hf1/6Zr1/6Ti1/6(Ta-Nb-Hf-Zr-Ti),is systematically studied to examine changes in superconducting critical properties,critical temperature(Tc),critical cur-rent density(Jc),and upper critical field(Hc2),concerning thermal treatment conditions.Annealing condi-tion affects Jc more significantly than Tc and Hc2,with a large improvement of flux pinning force density(Fp).The Jc of bare sample is reduced to 10 A cm-2 at an applied magnetic field of approximately 1.5 T,whereas the sample annealed at 550 ℃ for 12 h exhibits Jc＞100 kA cm-2 up to around 4 T.Furthermore,the Vickers hardness(HVIT)of the Ta-Nb-Hf-Zr-Ti HEA superconductor notably increases from～384 to 528 HVIT following a 24-h annealing at 500 ℃.These results demonstrate that thermal annealing is a powerful process to optimize both the superconducting and mechanical properties of high-entropy alloy superconductors.
基金项目
accelerator group and operators of KOMAC(KAERI)()
National Research Foundation of Korea(NRF)grant funded by the Korean government(MIST)(2021R1A2C2010925)
National Research Foundation of Korea(NRF)grant funded by the Korean government(MIST)(RS-2023-00240326)
National Research Foundation of Korea(NRF)grant funded by the Korean government(MIST)(RS-2023-00220471)
Basic Science Research Program through the NRF of Korea funded by the Ministry of Education(NRF-2019R1F1A1055284)
Basic Science Research Program through the NRF of Korea funded by the Ministry of Education(NRF-2021R111A1A01043885)
NETL
NSTL
万方数据