HOT-HARDNESS COMPARISONS AMONG ISOSTRUCTURAL BE12X INTERMETALLIC COMPOUNDS

Hot hardness has been measured in seven isostructural Be12X compounds: Be12Cr, Be12Mn, Be12V, Be12Mo, Be12Ti, Be12Ta, and Be12Nb. All vacuum -hot-pressed (VHP) materials exhibited similar hardness levels (800 to 1000 kg/mm2) at low temperatures (<600-degrees-C), but sharply diverg ed at higher temperatures. Most compounds showed a sharp decrease in h ardness above about one-half their melting temperatures except for Be1 2Nb and Be12Ti which maintained strength until higher temperatures. Du ctile-brittle transition temperatures (DBTT's) of 600, 625, 690, 700, 700, and 850-degrees-C were determined for Be12Cr, Be12Mn, Be12V, Be12 Mo, Be12Ti, and Be12Nb, respectively. Hot-isostatically-pressed (HIP) and VHP Be12Nb heats both showed comparable behavior, indicating that the temperature required for macroscopic plasticity is not dependent o n processing conditions. Differences in slip characteristics were obse rved between beryllides with similar melting temperatures, but differi ng DBTT's. Dislocations were activated on multiple slip systems in Be1 2V during compressive deformation at 800-degrees-C. Similar behavior w as not observed in Be12Nb until test temperatures above 1000 It is pro posed that dislocation mobility may be related to the stability betwee n Be12X and Be17X2 phases. Larger refractory metal atoms such as Nb ma y form faulted layers related to Be17X2 StruCtUres and thereby impede deformation at intermediate temperatures. Smaller atoms such as Cr, Mn , V, and Mo do not form a stable Be17X2 phase and thereby allow enhanc ed dislocation mobility at these temperatures.