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• W4206412284 abstract "Abstract Ba x K 1− x Fe 2 As 2 (BaK-122) iron-based superconductors (IBSs) have been considered to be promising for high-field applications. The transport J c performance of BaK-122 wires and tapes is continuously enhanced by introducing advanced fabricating methods. The mass density of BaK-122 superconducting core in wires and tapes is important to the transport J c performance and related to the mechanical behavior during preparation. In this work, the mechanical property parameters including Poisson’s ratio-density, yield strength-density, and elastic modulus-density of BaK-122 IBS powder were examined via uniaxial compression experiments. The density-dependent mechanical constitutive of BaK-122 was obtained for the first time. The relationship function between density and Vickers hardness of BaK-122 was established as HV 0.05 = 0.0249 ρ 5.332 based on the numerical simulation of hardness testing, and a method for characterizing the BaK-122 core density was developed. It had been found the sheath materials and preparation method have great influences on the stress state of the BaK-122 core, and then affect the density. The densification mechanism and corresponding improvement method were revealed to provide guidance for preparing high-density BaK-122 wires and tapes. Finally, the generalized relationship between density and the superconducting transport J c was established according to lots of experimental data from multiple BaK-122 samples, which has confirmed the positive correlation of ρ core and J c . We comparatively discussed the various cold-work and heat-treatment processes used in our team for preparing the BaK-122 wires and tapes, and the critical factors affecting the transport performance were summarized." @default.
• W4206412284 created "2022-01-25" @default.
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• W4206412284 date "2022-03-23" @default.
• W4206412284 modified "2023-09-30" @default.
• W4206412284 title "Mechanical properties and densification mechanism of powder-in-tube Ba _x K_1−xFe₂As₂ superconductors" @default.
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• W4206412284 doi "https://doi.org/10.1088/1361-6668/ac4ba0" @default.
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