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An evaluation of the creep properties of two Al-Si alloys produced by rapid solidification processing

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Abstract

Tensile creep tests were conducted on two Al-Si alloys produced by rapid solidification: an Al-Si-Ni-Cr alloy and an Al-Si-Cu-Fe alloy, designated alloys A and B, respectively. The creep curves of these two alloys in the temperature range from 493 to 573 K were markedly different, with alloy A exhibiting a normal creep curve with a very short tertiary region and alloy B exhibiting an extended tertiary stage associated with strain localization. The minimum creep rates varied, with the applied stress raised to exponents of ∼9.0 and ∼8.5 for the two alloys, respectively. The hardness of alloy B decreased with time during the creep testing, but there was little or no change in the hardness of alloy A. These differences in the creep and hardness characteristics are attributed to the evolution of precipitates within the two alloys during creep testing. A detailed analysis shows that, over the temperature range examined experimentally, alloy A exhibits a creep strength that is superior to conventional Al-based alloys and comparable to, or even higher than, some SiC-reinforced Al composites.

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Author notes

  1. Luboš Kloc (Visiting Research Fellow, Research Scientist)

    Present address: the Department of Mechanics, University of Ancona, I-60131, Ancona, Italy

Authors and Affiliations

  1. Institute of Physics of Materials, Academy of Sciences of the Czech Republic, 616 62, Brno, Czech Republic

    Luboš Kloc (Visiting Research Fellow, Research Scientist)

  2. the Department of Mechanics, University of Ancona, I-60131, Ancona, Italy

    Stefano Spigarelli (Researcher), Emanuela Cerri (Postdoctoral Associate) & Enrico Evangelista (Professor)

  3. the Departments of Materials Science and Mechanical Engineering, University of Southern California, 90089-1453, Los Angeles, CA

    Terence G. Langdon (Professor)

Authors
  1. Luboš Kloc
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  2. Stefano Spigarelli
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  3. Emanuela Cerri
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  4. Enrico Evangelista
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  5. Terence G. Langdon
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Kloc, L., Spigarelli, S., Cerri, E. et al. An evaluation of the creep properties of two Al-Si alloys produced by rapid solidification processing. Metall Mater Trans A 27, 3871–3879 (1996). https://doi.org/10.1007/BF02595636

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  • DOI: https://doi.org/10.1007/BF02595636

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