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Separation in ε-Phase of BiPb Alloy under Mega-Gravity

Homogeneous Bi-Pb alloy samples in the ε-phase are treated under mega-gravity centrifugal acceleration field. Atomic sedimentation in solid and associated partial crystallization occurs during the treatment. Small differences of densities in the ε-phase are enhanced under the mega-gravity, and they cause the separation of the ε-phase between fully packed hcp structure of the Bi3Pb7 and partially defected hcp structure of the Bi3Pb7-δ. The compositional graded superconducting alloy is obtained in the latter. Partially melt-growth occurs in the latter and microstructure of Pb is formed along the gravity field associating with the formation of highly oriented the (211) phase of Bi3Pb7-δ. The superconductivity parallel to gravity is Pb, and perpendicular to gravity is Bi3Pb7-δ as the result. Superconducting properties differs between the separated two phases.