Deformation and Fracture of Polycrystalline Lithium Fluoride |
Common terms and phrases
3-grain junctions anneal applied load applied stress barriers to slip bend test BORON NITRIDE boundary slip CALCULATED OUTER FIBER chemically polished cleaved compression surface condition for crack crack nucleation crucible deformation and fracture ductility edge dislocations elastic etch fracture of polycrystalline fracture stress g/cm² grain boundary grain size high local stresses individual grains ingot length of grain limited number lithium fluoride macroscopic stress-strain curve maintain boundary contact Major slip neighboring grains number of slip operating Not operating OUTER FIBER STRAIN outer fiber stress pile-up plastic deformation plastic flow polycrystal LiF polycrystalline aggregate polycrystalline LiF polycrystalline specimens resolved shear stress resolved-shear stresses room temperature samples screw bands shown in Fig single crystals single-crystal LiF slip band slip direction Slip lines slip plane slip systems slip throughout crystal slip traces stereographic projection strain at fracture Stroh surface energy tension axis tension surface test specimen thermocouple three-grain junction yield stress