Orientation dependence of primary dendrite spacing

Journal Article · Sun Sep 01 04:00:00 EDT 1996 · Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science

DOI:https://doi.org/10.1007/BF02652367· OSTI ID:382523

Gandin, C A ^[1]; Eshelman, M; Trivedi, R ^[2]

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1. Ecole Polytechnique Federale, Lausanne (Switzerland). Lab. de Metallurgie Physique
2. Ames Lab., IA (United States)

The orientation dependence of the primary dendrite spacing is examined through the solidification of a succinonitrile-3.61 wt pct acetone alloy with a Bridgman-type device. Primary dendrite spacing has been studied as a function of the primary dendrite trunk orientation with respect to the thermal gradient direction under different growth rate conditions. The observations show that the orientation dependence of the primary dendrite spacing can be related to the formation of new primary dendrites at divergent grain boundaries via the branching mechanism. A branching-based model is developed to study the interaction between secondary and tertiary dendrite arms. Based on this model, a simple analytical relationship is proposed to account for the orientation dependence of the primary dendrite spacing.

• Sponsoring Organization: USDOE
• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 382523
• Journal Information: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, Journal Name: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science Journal Issue: 9 Vol. 27; ISSN 1073-5623; ISSN MMTAEB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ACETONE
CHEMICAL COMPOSITION
COMPOSITE MATERIALS
GRAIN BOUNDARIES
HEAT FLUX
INTERFACES
LIQUIDS
MATHEMATICAL MODELS
NITRILES
SOLIDIFICATION
SOLIDS
SUCCINIC ACID
TEMPERATURE GRADIENTS
VELOCITY