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Fabrication of Al-Zn solid solution via friction stir processing
Published in Elsevier Inc.
2018
Volume: 136
   
Pages: 221 - 228
Abstract
The present study demonstrates that friction stir processing (FSP) can be used as a mechanical alloying tool to process solid solution. Zn was incorporated in commercially pure aluminium by multi-pass FSP leading to its dissolution and formation of supersaturated solid solution which was confirmed by X-ray diffraction and scanning electron microscopy. The hardness across the stir zone matched with the distribution of Zn and was significantly improved compared to the base metal. The supersaturated solid solution that formed in the first pass, partially decomposed during the second pass, leading to the formation of fine Al-Zn precipitates. Thermal stability of the microstructure against abnormal grain growth was also improved after the second pass due to the pinning effect of the grain boundary precipitates. FSP also caused grain refinement of the alloy yielding fine equiaxed grains in the range of 4–6 μm with a high fraction (> 67%) of high angle grain boundaries. Such microstructure is conducive for isotropic properties and the fact that the microstructure is stable against thermal cycles make the process suitable for selective alloying for location specific property enhancement. © 2017 Elsevier Inc.
About the journal
JournalData powered by TypesetMaterials Characterization
PublisherData powered by TypesetElsevier Inc.
ISSN10445803
Open AccessNo
Concepts (29)
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    Aluminum
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    Aluminum alloys
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    Binary alloys
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    Electron microscopy
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    FERRITES
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    Friction
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    Friction stir welding
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    Grain boundaries
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    Grain growth
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    Grain refinement
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    Hardness
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    Mechanical alloying
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    Metallurgy
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    Microstructure
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    Scanning electron microscopy
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    Thermodynamic stability
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    Tribology
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    X ray diffraction
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    Zinc
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    Zinc alloys
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    Abnormal grain growth
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    Fine equiaxed grains
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    Friction stir processing
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    GRAIN BOUNDARY PRECIPITATE
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    High angle grain boundaries
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    METALS AND ALLOYS
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    SPECIFIC PROPERTIES
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    SUPERSATURATED SOLID SOLUTIONS
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    Solid solutions