FUNDAMENTAL AND APPLIED RESEARCH AND DEVELOPMENT IN METALLURGY Stability of the High Temperature Beta Phase in Beryllium and Beryllium Alloys Final Technical Report to the United States Atomic Energy Commission for the Period July l, 1960 Through June 30, 1961

摘要

The discovery of a high-temperature phase in beryllium has opened a new field of study in beryllium metallurgy. Studies in this field have been carried out over the past year. Differential thermal analysis (DTA) to determine equilibrium phase boundaries has been applied to alloys of beryllium in each of the following systems: barium, cerium, cobalt, copper, lanthanum, manganese, platinum, silver, nickel-cobalt, nickel-iron, nickel-copper, nickel-cobalt-iron, and nickel-cobalt-manganese. The boundaries of the beta beryllium regions in the systems beryllium-cobalt and beryllium-copper have been fairly well established;the remaining systems require further study using additional test methods. The beryllium-nickel system, studied previously, and the beryllium-cobalt and beryllium-copper systems enlarge the beta field and lower the beta-to-alpha transus temperature, thus making these systems suitable for further study of the beta phase. A correlation was found between the beta-alpha upper solvus transition temperatures and electron-to-atom ratios for alloys of beryllium with cobalt, copper, iron and nickel. Application of this relationship to ternary and quaternary alloys met with some success.