Cellular and dendritic growth in rapidly solidified Al-Fe and Al-Cu alloys

Journal Article · Sun May 01 04:00:00 EDT 1994 · Acta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-7151(94)90375-1· OSTI ID:5055152

Lu, Shu Zu; Hunt, J D ^[1]; Gilgien, P; Kurz, W ^[2]

---

1. Univ. of Oxford (United Kingdom). Dept. of Materials
2. Swiss Federal Inst. of Tech. Lausanne (Switzerland)

A recent numerical model of cellular and dendritic growth has been extended into the high velocity region where the distribution coefficient, liquids slope and diffusion coefficients depend on the growth velocity. The primary spacing selection mechanism is modeled so that no a priori assumptions need be made about a spacing selection condition. The results are compared with experimental primary spacing measurements obtained using rapid laser resolidification and good agreement is found. The numerical results for undercooling and tip radii are compared with those predicted for dendrites using marginal stability arguments, showing the potential and limits of the analytical models. The effect of high velocity on microsegregation is examined and microsegregation profiles are predicted.

• OSTI ID: 5055152
• Journal Information: Acta Metallurgica et Materialia; (United States), Journal Name: Acta Metallurgica et Materialia; (United States) Vol. 42:5; ISSN 0956-7151; ISSN AMATEB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOY SYSTEMS
ALLOYS
ALUMINIUM ALLOYS
ALUMINIUM BASE ALLOYS
BINARY ALLOY SYSTEMS
COPPER ALLOYS
CRYSTALS
DATA
DENDRITES
INFORMATION
IRON ALLOYS
MATHEMATICAL MODELS
MICROSTRUCTURE
NUMERICAL DATA
PHASE TRANSFORMATIONS
SOLIDIFICATION
THEORETICAL DATA