Tensile strength and fracture surface topography of Sm-Ba-Cu-O bulk superconductors

A. Murakami, K. Katagiri, K. Kasaba, Y. Shoji, K. Noto, N. Sakai, M. Murakami

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11 Citations (Scopus)

Abstract

Scanning electron microscopy observations have been made on fracture surfaces induced by tensile tests of Ag-added SmBa2Cu3Oy/Sm2BaCuO5 composite bulk superconductors melt-grown in O2 and 1%O2/Ar atmospheres. It was deduced that the inferior tensile strength in the bulk grown in l%O2/Ar, as compared with that of the bulk grown in O2, was caused by the larger size and volume fraction of the included voids. The tensile strength of a specimen with a fracture surface consisting of multiple facets was lower than that with a single facet for the bulks grown in both conditions. It was found that a rectangular facet on the fracture surface is a possible origin for the fatal crack and that the secondary phase particles on that area act as anchoring points for initial crack propagation.

Original languageEnglish
Pages (from-to)1099-1104
Number of pages6
JournalSuperconductor Science and Technology
Volume15
Issue number7
DOIs
Publication statusPublished - 2002 Jul 1

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ASJC Scopus subject areas

  • Ceramics and Composites
  • Condensed Matter Physics
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry

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