DUCTILE CERAMICS RESEARCH
CALIFORNIA UNIV BERKELEY INST OF ENGINEERING RESEARCH
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Work was confined to studies of cubic crystal ductility. Such material is highly ductile at room temperature when tested in single crystal form. Surface effects are extremely important and good ductility can be obtained only with specimens having carefully prepared chemically polished surfaces. It was found that MgO single crystals are ductile at room temperature and values of elongation in excess of 10 were obtained regularly. Alloying of ionic solids increased their strength. Recent work concerned grain boundary effects on the ductility of ionic solids experiments indicated the smaller the grain size, the higher the strength, and the greater the probability of significant deformation before fracture. High purity is essential. Extrusion was chosen as a means of fabricating fine-grained LiF and slightly ductile specimens were obtained.