Pore shrinkage and Ostwald ripening in metallic systems. Progress report, July 1, 1978-June 30, 1979

Technical Report · Thu Mar 01 00:00:00 EST 1979

DOI:https://doi.org/10.2172/5394434· OSTI ID:5394434

Kuczynski, G. C.; Allen, C. W.

The new theory of Ostwald ripening phenomena is gradually unfolding. Based on the principle of minimum rate of entropy production, the general method including the mathematical formalisms of variational calculus, is now understood and has been applied to the case of annealing of void structures, a situation somewhat simpler to model than is particle coarsening. The resultant void distribution function is compared with that expected from the LSW theory and with experiments. Developments in three areas are described: generation and annealing of voids in HVEM, distribution of Ni/sub 3/Al in Ni-Al alloys, and production of reproducible pore structures in nickel powder compacts.

• Research Organization: Notre Dame Univ., IN (USA)
• DOE Contract Number: EG-77-S-02-4385
• OSTI ID: 5394434
• Report Number(s): COO-4385-3; TRN: 80-007997
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
SELF-DIFFUSION
MICROSTRUCTURE
SHRINKAGE
NICKEL ALLOYS
VOIDS
DISTRIBUTION
ANNEALING
CERAMICS
COMPACTS
INTERMETALLIC COMPOUNDS
NICKEL
PARTICLE SIZE
POROSITY
POWDERS
ALLOYS
CRYSTAL STRUCTURE
DIFFUSION
ELEMENTS
HEAT TREATMENTS
METALS
SIZE
TRANSITION ELEMENTS
360103* - Metals & Alloys- Mechanical Properties
360102 - Metals & Alloys- Structure & Phase Studies