Abstract
1. The coalescence of particles of second phase, precipitated from solid solution, proceeds at diminishing rate during the aging at high temperature of nickel-base alloys. At constant aging temperature, the rate of this process is determined by the composition. 2. Boron accelerates growth of second phase particles (alloys 1 and 2). The increased al uminum content in alloy 3 decreases the mean growth rate of the particles. 3. At any particular aging time, a variety of particle sizes exists. However, particles of a certain size predominate. 4. There is a definite correspondence between the growth rate of particles and the time variation of the rupture strength. Hence structural changes have an important effect on the change of rupture strength with time.
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