Microstructure and mechanical of MTG YBCO

Abstract

MTG (melt-texture-growth) samples were prepared by passing teh YBa2Cu3O7-x pellets (solid state reaction products) through a furnace with a temperature gradient of 15 °C for 5, 10 and 15 min, respectively. The Jc value, Vickers hardness and fracture toughness of the above samples were measured. And the results indicated that 211 precipitates can influence not only the critical current density, but also the mechanical properties According to microstructure analysis and fracture mechanics theory, the effects of 211 precipatates which can act as a toughening agent on mechanical gains were discussed in this paper.