Accession Number:

ADA076947

Title:

Application of Solidification Theory to Rapid Solidification Processing

Descriptive Note:

Semi-annual technical rept. 1 Apr-30 Sep 1979

Corporate Author:

NATIONAL BUREAU OF STANDARDS WASHINGTON DC METAL SCIENCE AND STANDARDS DIV

Personal Author(s):

• Boettinger, W. J.
• Cahn, J. W.
• Coriell, S. R.
• Manning, J. R.

Report Date:

1979-10-01

Pagination or Media Count:

19.0

Abstract:

Work is reported on the following areas of rapid solidification processing 1 Microsegregation and Stability at the Solidification Interface, 2 Glass Formation by Rapid Cooling of Eutectic Systems, 3 Compositional Limits Imposed by Thermodynamics during Rapid Solidification and Relative Stability of Heterogeneous Microstructures. The theory of rapid solidification was investigated to determine whether major aspects of rapid solidification processes can be explained by conventional solidification theory and to examine non-equilibrium effects which can arise. In particular, segregation effects, glass-forming tendencies, and rules governing the formation of equilibrium and non-equilibrium phases, including alloy composition limits, reaction sequences and metastable phase formation, will be investigated.

Descriptors:

• *ALLOYS
• *PROCESSING
• *SOLIDIFICATION
• CHEMICAL COMPOSITION
• COMPUTATIONS
• COOLING
• FREEZING
• HIGH RATE
• INTERFACES
• LIMITATIONS
• MICROSTRUCTURE
• PREDICTIONS
• SEGREGATION(METALLURGY)
• STABILITY
• THEORY
• VELOCITY

Subject Categories:

• Industrial Chemistry and Chemical Processing
• Properties of Metals and Alloys
• Fabrication Metallurgy
• Crystallography

Distribution Statement:

APPROVED FOR PUBLIC RELEASE