Fig. 2. Time to es tablish the equilibrium viscosi ty at var ious tempera tures . Fig. 1. The p rocess of s t ructura l reorganizat ion, c h a r a c t e r ized by the absence of elongation of the specimen with an inc r ease in tempera ture , occurs in this case, at above 400 ~ . The p rocess can be observed up to the temperature at which elongation of the specimen begins anew. The temperature range over which an accelera t ion of the expansion occurs is the same for the annealed as for the initially tempered spec i men.