Theory of layered-structure formation in peritectic systems

Journal Article · Thu Jun 01 04:00:00 EDT 1995 · Metallurgical Transactions, A

DOI:https://doi.org/10.1007/BF02647608· OSTI ID:78419

Trivedi, R ^[1]

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1. Dept. of Energy, IA (United States). Ames Lab.

Two-phase growth in a peritectic system has been examined, and a theoretical model is developed for the formation of a layered structure in which two phases form alternate layers that are oriented parallel to the interface. The width of each layer and the spacing between layers have been shown to be inversely proportional to velocity, and the proportionality constants depend upon the nucleation temperatures for the two phases. The nucleation temperatures for the two phases are shown to play a critical role in the formation and stability of layered structures. The range of compositions over which layered structures can form is identified, and it is shown that convection effects in the liquid will destabilize the layered structure. Several key experimental studies have been identified to evaluate minimum undercoolings required for the nucleation of each of the two phases. The morphology of the transition interface is shown to depend upon the relative effects of nucleation and growth of the two phases.

• Sponsoring Organization: USDOE
• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 78419
• Journal Information: Metallurgical Transactions, A, Journal Name: Metallurgical Transactions, A Journal Issue: 6 Vol. 26; ISSN 0360-2133; ISSN MTTABN
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALLOYS
MATHEMATICAL MODELS
MICROSTRUCTURE
PHASE DIAGRAMS
PHASE STUDIES
TEMPERATURE DEPENDENCE