Phase precipitation in transition metal-containing 354-type alloys

Guillermo H. Garza-Elizondo; Agnes M. Samuel; Salvador Valtierra; Fawzy H. Samuel

doi:10.3139/146.111455

Artikel

Phase precipitation in transition metal-containing 354-type alloys

Guillermo H. Garza-Elizondo , Agnes M. Samuel , Salvador Valtierra und Fawzy H. Samuel

Veröffentlicht/Copyright: 31. Januar 2017

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Aus der Zeitschrift International Journal of Materials Research Band 108 Heft 2

Abstract

The present study was carried out to investigate the effects of Ni, Mn, Zr, and Sc additions, individually or in combination, on the microstructure of 354 casting alloy (Al-9 wt.% Si-1.8 wt.% Cu-0.5 wt.% Mg). Microstructural examination and thermal analysis data showed that the main reactions detected during the solidification of the six 354 alloys (G1, G6–G10) investigated are: formation of the α-Al dendritic network; precipitation of Al-Si eutectic and post-eutectic β-Al₅FeSi; Mg₂Si phase; transformation of the β-phase into π-Al₈Mg₃FeSi₆ phase; and precipitation of Al₂Cu and Q-Al₅Mg₈Cu₂Si₆ phases. With 2 wt.% Ni addition, the formation of Al₉FeNi and Al₃CuNi phases is observed. In the base 354 alloy the main phases are restricted to Cu-, Mg-, and Fe-rich intermetallic phases. The Si particle characteristics and volume fraction of intermetallics are influenced by the solidification rate and Mg level, whereas addition of Fe and/or Mn has no significant influence. In alloy G9, Fe, Mn and Ni interact to form new intermetallic phases. An increased Fe content leads to formation of polyhedral/star-like sludge particles in addition to α-Fe and β-Al₅FeSi phases; the presence of the hard sludge particles within the soft α-Al dendrites improves the alloy properties.

Keywords: Aluminum alloys; Thermal analysis; Phase identification and quantification; Intermetallics

*Correspondence address, Dr. Fawzy H. Samuel, Professor, Département des Sciences appliquées, Université du Québec à Chicoutimi, 555, Boulevard de l'Université, Chicoutimi (Quebec) G7H 2B1, Canada, Tel.: +1418-545-5406, Fax: +1418-545-5012, E-mail: fhsamuel@uqac.ca

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Received: 2016-04-11

Accepted: 2016-10-11

Published Online: 2017-01-31

Published in Print: 2017-02-10

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Artikel in diesem Heft

https://doi.org/10.3139/146.111455

Schlagwörter für diesen Artikel

Aluminum alloys; Thermal analysis; Phase identification and quantification; Intermetallics