Coarsening of. gamma. ' precipitates at large volume fractions
The kinetics of growth of the ..gamma..' precipitate in binary Ni-7, 8, 9 and 9.9 wt % Al alloys, containing ..gamma..' volume fractions ranging from 0.09 to 0.60 at the aging temperature of 800/sup 0/C, were studied by magnetic analysis and transmission electron microscopy. The coarsening of ..gamma..' precipitates in ternary Ni-16.9 wt % Cr-3.4 wt % Al and 14.2 wt % Cr-4.9 wt % Al alloys aged at 750/sup 0/C was also investigated by transmission electron microscopy. These studies were undertaken to provide a critical test of a recent modification of the Lifshitz-Slyozov-Wagner theory (the MLSW theory) of diffusion-controlled particle coarsening, which predicts a pronounced effect of volume fraction on the kinetics of coarsening and on the distribution of particle sizes.
- Research Organization:
- California Univ., Los Angeles (USA). School of Engineering and Applied Science
- DOE Contract Number:
- AT03-76ER70172
- OSTI ID:
- 6422483
- Report Number(s):
- UCLA-ENG-7351; UCLA-34P172-9
- Country of Publication:
- United States
- Language:
- English
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