Predictions of the Hunt-Lu array model compared with measurements for the growth undercooling of Al{sub 3}Fe dendrites in Al-Fe alloys

Journal Article · Wed Oct 01 00:00:00 EDT 1997 · Scripta Materialia

DOI:https://doi.org/10.1016/S1359-6462(97)80263-1· OSTI ID:540999

Liang, D ^[1]; Jones, H ^[2]

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1. CSIRO, Clayton, Victoria (Australia). Div. of Materials Science and Technology
2. Univ. of Sheffield (United Kingdom). Dept. of Engineering Materials

Earlier contributions by the authors reported the first measurements of growth temperature as a function of growth velocity V and alloy concentration C{sub 0} for a dendritic intermetallic phase (Al{sub 3}Fe, in Al-rich Al-Fe alloys). Comparison with predictions of the model of Kurz, Giovanola and Trivedi (KGT model) of dendrite growth of a needle gave predicted {Delta}T a factor between 1.1 and 2.5 above the measured values. A subsequent paper presented evidence that the Al{sub 3}Fe dendrite tips were indeed needle-like under the conditions studied, as distinct from the plate-like morphology that develops behind the dendrite tips. The KGT model predicts T{sub G} and {Delta}T on the basis that marginal stability determines the operating condition at the dendrite tip. The present purpose is to compare the measurements with predictions of the more recently developed array model of Hunt and Lu.

• OSTI ID: 540999
• Journal Information: Scripta Materialia, Vol. 37, Issue 7; Other Information: PBD: 1 Oct 1997
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
MICROSTRUCTURE
ALUMINIUM ALLOYS
IRON ALLOYS
INTERMETALLIC COMPOUNDS
DENDRITES
CONCENTRATION RATIO
PREDICTION EQUATIONS
VALIDATION