Evaluations of Mechanical Properties in Dy123 Single-Grain Bulk Superconductors With Low Porosity

In order to improve the mechanical properties of the Dy123 bulk material, a precursor was melted in 100% O₂ atmosphere to obtain bulk with low porosity. Evaluations of the mechanical properties in the Dy123 bulk were carried out through bending tests and Vickers indentation tests. The mechanical properties such as Young´s modulus and bending strength were improved by eliminating pores. The mechanical properties of Dy123 bulks melt-processed in 50 and 75% O₂ atmosphere were also evaluated and the relationship between the mechanical properties and the porosity associated with the oxygen annealing was discussed.