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Ran, Mingming [Author]; Qu, Pengshuai [Author]; Liu, Guangbin [Author]; Liu, Lian [Author]; Chen, Yongliang [Author]; Sun, Xiaguang [Author]; Liu, Jianwei [Author]; Yan, Guo [Author]; Feng, Yong [Author]; Zhang, Yong [Author]; Zhao, Yong [Author]; Yu, Zhou [Author]

Microstructure Evolution of Powder in Tube Nb3al Wires During Rapid Heating Process and Properties of the Transformed Superconducting Wires

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  • Media type: E-Book
  • Title: Microstructure Evolution of Powder in Tube Nb3al Wires During Rapid Heating Process and Properties of the Transformed Superconducting Wires
  • Contributor: Ran, Mingming [VerfasserIn]; Qu, Pengshuai [VerfasserIn]; Liu, Guangbin [VerfasserIn]; Liu, Lian [VerfasserIn]; Chen, Yongliang [VerfasserIn]; Sun, Xiaguang [VerfasserIn]; Liu, Jianwei [VerfasserIn]; Yan, Guo [VerfasserIn]; Feng, Yong [VerfasserIn]; Zhang, Yong [VerfasserIn]; Zhao, Yong [VerfasserIn]; Yu, Zhou [VerfasserIn]
  • imprint: [S.l.]: SSRN, [2022]
  • Extent: 1 Online-Ressource (18 p)
  • Language: English
  • DOI: 10.2139/ssrn.4022312
  • Identifier:
  • Origination:
  • Footnote:
  • Description: This paper studied the microstructure evolution of powder in tube (PIT) Nb3Al precursor with significant variation of local Nb layer thickness, which is an ideal system for simulating the inhomogeneous element distribution effect of the long length wire during rapidly heating and quenching (RHQ). Precursor wire with different initial Al content in raw powder was rapidly heated at different energy density, and the phase formation sequence can be concluded as: Nb + Al → eutectic phase + NbAl3 → Nb3Al + Nb2Al → grid morphology bcc → band feature bcc. The phase and microstructure during RHQ were mainly determined by the RHQ condition and local Al distribution below its diffusion distance, for similar feature was shown in the wire with different initial Al content between 22 at% and 28 at%. In the PIT wires, the bcc region can be subdivided into three steps, with Al content of 24~32 at%, 20~ 25 at%, 22 at% and steeply diminish of residual Nb particles was cleared investigated. After 800 ℃ transformation heat treatment, wire quenched at step 2 of bcc region show the best superconducting properties in the 26 at% Al precursor wire. The transformed superconductor shows range of Tc from 16.6 K to 17.1 K, ΔTc of 0.5 K ~ 0.8 K, and Jc at 8 K, 5 T from 4.7×104 A/cm2 to 2.0×105 A/cm2 , Birr of 14.5 T - 15.7 T at 8 K in precursor wires with initial Al content between 22 at% to 28 at%. The results of the microstructure evolution indicated that controlling the thickness of the Nb layer well below the Al diffusion distance plays a crucial role in obtaining a homogeneous bcc solid phase
  • Access State: Open Access