Phase precipitation in transition metal-containing 354-type alloys

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 detect...

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Veröffentlicht in:International journal of materials research 2017-02, Vol.108 (2), p.108-125
Hauptverfasser: Garza-Elizondo, Guillermo H., Samuel, Agnes M., Valtierra, Salvador, Samuel, Fawzy H.
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container_end_page 125
container_issue 2
container_start_page 108
container_title International journal of materials research
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creator Garza-Elizondo, Guillermo H.
Samuel, Agnes M.
Valtierra, Salvador
Samuel, Fawzy H.
description 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-Al FeSi; Mg Si phase; transformation of the β-phase into π-Al Mg FeSi phase; and precipitation of Al Cu and Q-Al Mg Cu Si phases. With 2 wt.% Ni addition, the formation of Al FeNi and Al CuNi 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-Al FeSi phases; the presence of the hard sludge particles within the soft α-Al dendrites improves the alloy properties.
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source De Gruyter journals
subjects Aluminum alloys
Aluminum base alloys
Formations
Intermetallic compounds
Intermetallic phases
Intermetallics
Manganese
Microstructure
Phase identification and quantification
Phase transformations
Precipitation (chemistry)
Sludge
Solidification
Thermal analysis
title Phase precipitation in transition metal-containing 354-type alloys
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