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Effect of friction stir processing (FSP) on microstructure and properties of Al-TiC in situ composite
, G. Suhas
Published in
2011
Volume: 528
   
Issue: 13-14
Pages: 4732 - 4739
Abstract
Aluminium based in situ composites have many advantages over their conventional counterparts. However, a major problem in such composites is the segregation of the in situ formed particles at the grain boundaries. In this study, it has been shown for the first time that friction stir processing (FSP) can be used effectively to homogenise the particle distribution in Al based in situ composites. An Al-5wt.% TiC composite was processed in situ using a mixture of K2TiF6 and graphite powders in aluminium melt. Friction stir processing was employed on the as-cast composite to uniformly distribute the TiC particles in the Al matrix. The composite was subjected to single and double pass FSP and its effect on the microstructure and properties was evaluated. A single pass of FSP was enough to break the particle segregation from the grain boundaries and improve the distribution. Two passes of FSP resulted in complete homogenization and elimination of casting defects. The grain size was also refined after each FSP pass. This led to significant improvement in the mechanical properties. The novel feature of the composite is that while the strength and hardness improved substantially after FSP, the ductility was not compromised. © 2011 Elsevier B.V.
About the journal
JournalMaterials Science and Engineering A
ISSN09215093
Open AccessNo
Concepts (29)
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    ALUMINIUM MELTS
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    As-cast
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    Casting defect
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    Composites
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    DOUBLE PASS
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    Friction stir processing
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    Grain size
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    Graphite powder
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    In-situ
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    IN-SITU COMPOSITE
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    Matrix
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    Mechanical characterization
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    Microstructure and properties
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    PARTICLE DISTRIBUTIONS
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    PARTICLE SEGREGATION
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    SINGLE PASS
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    TIC PARTICLES
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    Aluminum
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    Friction
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    Grain boundaries
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    Grain refinement
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    Grain size and shape
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    Hardness
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    Mechanical properties
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    Microstructure
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    Segregation (metallography)
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    TITANIUM CARBIDE
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    Tribology
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    In situ processing