Planar Defects in High-Strength Materials for High Field Magnets

High field magnets use certain materials with planar defects that strengthen the materials. These defects can be introduced by cold deformation that produces high densities of both dislocations and planar defects or by phase transformation that mainly helps to form planar defects and strengthening particles. These defects in crystals act as obstacles to resist dislocation motions. The increased density of these obstacles increases the mechanical strength. Under tensile loading, such as the loading condition in high field magnets or in fabrication, the materials may soften or harden depending on the interaction of the obstacles with the dislocations evolved during the loading. Studying the behaviors of such defects in such environments helps researchers to predict the maximum strength achievable of these materials, to make efficient use of them in magnets, and to manufacture materials to meet the requirements of the magnets, particularly when the magnetic stress reaches the strength of certain components in high field magnets. The goal of this research is to understand the strengthening effect of planar defect on selected materials for high field magnets. We will discuss the role of planar defects on deformation and on phase transformation.<br/><b>Acknowledgements </b><br/>This was performed at the National High Magnetic Field Laboratory, USA, which is supported by National Science Foundation Cooperative Agreement [Grant No. NSF DMR-1644779] and the State of Florida, USA.