Rapidly solidified Al-Cu alloys--1--Experimental determination of the microstructure selection map

Journal Article · Wed Dec 01 04:00:00 EST 1993 · Acta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-7151(93)90237-M· OSTI ID:5876919

Gill, S C; Kurz, W ^[1]

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1. Swiss Federal Inst. of Technology, Lausanne (Switzerland). Dept. of Materials

Laser rapid solidification experiments have been performed on Al-Cu alloys of hypereutectic composition 36, 40, and 44 wt% Cu. By taking thin foils from the surface of the laser traces it has been possible to study the resulting growth morphologies using TEM; the microstructural orientation allowing the morphologies to be correlated with their local growth velocities. Microstructural features in the velocity range 0.01-2.0 ms[sup [minus]1] have been studied, and eutectic (both with and without oscillatory instabilities), dendritic, cellular, banded and planar front growth have all been observed. By combining these results with earlier observations made on alloys with lower Cu concentrations, it has been possible to produce a microstructure selection map for Al-Cu alloys. The map correlates microstructure to growth velocity and composition in the ranges 0.01-2.0 ms[sup [minus]1] and 0--44 wt% Cu, i.e. the major part of the binary Al-Al[sub 2]Cu eutectic. As well as providing an interesting overview of solidification structures, several features of this map can be used to gain information on the Al-Cu phase diagram.

• OSTI ID: 5876919
• Journal Information: Acta Metallurgica et Materialia; (United States), Journal Name: Acta Metallurgica et Materialia; (United States) Vol. 41:12; 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
DIAGRAMS
MICROSTRUCTURE
MORPHOLOGY
PHASE DIAGRAMS