Unconstrained growth along a ternary eutectic solidification path in Al–Cu–Ag: Preparation of a MAXUS sounding rocket experiment
During casting, unconstrained solidification occurs most frequently. The objectives of the present study were to describe the different stages of a ternary eutectic solidification path, its unconstrained solidification and to assess gravity dependent phenomena as a preparation for a MAXUS sounding r...
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Published in | Materials science & engineering. A, Structural materials : properties, microstructure and processing Vol. 413; pp. 514 - 520 |
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Main Authors | , , , |
Format | Journal Article |
Language | English |
Published |
Elsevier B.V
15.12.2005
|
Subjects | |
Online Access | Get full text |
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Summary: | During casting, unconstrained solidification occurs most frequently. The objectives of the present study were to describe the different stages of a ternary eutectic solidification path, its unconstrained solidification and to assess gravity dependent phenomena as a preparation for a MAXUS sounding rocket microgravity experiment. Two alloys within the Al–Cu–Ag system were selected. They form a different primary phase α(Al) or θ-Al
2Cu that however share the further solidification path. Nucleation of primary non-faceted α(Al) was enhanced by the addition of TiB
2. The same addition did not influence the nucleation of faceted θ-Al
2Cu. Gravity driven flotation of primary α(Al) was observed. Nucleation of the univariant eutectic α(Al)
+
θ-Al
2Cu is triggered by θ-Al
2Cu, whereas growth occurs with a lamellar, rod-like or irregular morphology. Growth of the invariant eutectic α(Al)
+
θ-Al
2Cu
+
ξ-Ag
2Al occurs either with an irregular, semi-regular brick type or regular double-rod type morphology, however, always with a strong association between θ-Al
2Cu and ξ-Ag
2Al. |
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Bibliography: | SourceType-Scholarly Journals-2 ObjectType-Feature-2 ObjectType-Conference Paper-1 content type line 23 SourceType-Conference Papers & Proceedings-1 ObjectType-Article-3 |
ISSN: | 0921-5093 1873-4936 |
DOI: | 10.1016/j.msea.2005.08.171 |