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On Porosity Formation in Al–Si–Cu Cast Alloys

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Light Metals 2017

Part of the book series: The Minerals, Metals & Materials Series ((MMMS))

Abstract

The aim of the present work was to investigate the metallurgical parameters controlling porosity formation in Al–Si–Cu alloys, through a study of the microstructural characteristics of directionally solidified 319.2 alloys as a function of iron content, Sr addition (250 ppm), and solidification rate . The iron levels selected varied from 0.12 to 0.8 wt%, and cover the range of Fe levels found in commercial casting alloys. The use of an end-chilled mold provided different solidification rates along the height of the same casting, with DAS values that varied from ~15 to 85 μm, corresponding to levels of 5, 10, 30, 50 and 100 mm above the chill end. The amount of iron present in the alloy affects the size of the beta-iron Al5FeSi platelets and their distribution, particularly at low solidification rates. Addition of strontium leads to fragmentation of co-eutectic or post-eutectic beta-iron platelets.

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Author information

Authors and Affiliations

  1. Université Du Québec à Chicoutimi, Chicoutimi, QC G7H 2B1, Canada

    F. H. Samuel & A. M. Samuel

  2. General Motors Materials Engineering, 823 Joslyn Ave, Pontiac, MI, 48340, USA

    H. W. Doty

  3. Nemak, S.a, P.O. Box 100, Garza Garcia, N.L, 66221, Mexico

    S. Valtierra

Authors
  1. F. H. Samuel
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  2. A. M. Samuel
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  3. H. W. Doty
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  4. S. Valtierra
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Corresponding author

Correspondence to F. H. Samuel .

Editor information

Editors and Affiliations

  1. SINTEF , Trondheim, Norway

    Arne P. Ratvik

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© 2017 The Minerals, Metals & Materials Society

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Samuel, F.H., Samuel, A.M., Doty, H.W., Valtierra, S. (2017). On Porosity Formation in Al–Si–Cu Cast Alloys. In: Ratvik, A. (eds) Light Metals 2017. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-319-51541-0_33

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