Phase transformations in Pu-Ga and Pu-Al alloys Effects of pressure and temperature on kinetics of delta-phase decomposition

摘要

Pressure effected evolution of equilibrium and metastable binary Pu-Ga (Al)-phase diagrams is discussed. With an increase in pressure delta-solid solution region decreases and disappears, which leads to a change of phase diagram type. In experiments and via thermodynamic calculations boundaries of 8-phase region were established at pressure varying from the atmospheric one to approx l GPa. Temperature of 8-phase eutectoid transformation versus pressure was determined; a fragment pressure-temperature-composition (PTC) diagram was constructed, parameters of four-phase equilibrium were found. Influence of static pressure on S-phase decomposition kinetics is demonstrated, feasibility of decomposing effected by loading with high intensity waves is assessed.