Large-grain RE (rare earth elements)-Ba-Cu-O bulk superconductors have potential trapping magnetic fields greater than 5T at liquid-nitrogen temperature. However, cracks are easily formed in large bulk samples due to their poor mechanical properties. Thus, the maximum trapped magnetic field is restricted by the mechanical properties rather than superconducting properties. It is therefore important to seek techniques to enhance the mechanical properties. In this review, I summarize the present status of investigations regarding the mechanical properties for melt-processed RE-Ba-Cu-O bulk superconductors.
