In-situ reinforcement of Aluminium casting alloys

The development of Aluminum alloys mainly tends to increase the strength without worsening the ductility. Beside strength an increase in stiffness is also sought. In contrast to strength with Aluminium casting alloys the stiffness can be influenced by alloying to a very small extent only. A substantial increase in stiffness is possible by metal matrix composits. But poor wettability between the metal matrix and the ceramic particels and big differences in the thermal expansion lead to poor mechanical properties. One possible approach to solve these problems is using intermetallics based on Aluminium as reinforcement. These phases have a low density and a good wettability with the Aluminium matrix. Moreover, these phases can be produced by an in-situ reaction in the aluminum melt. The volume fraction of the reinforcing phase increases with this reaction. A special stirring technique ensures that the reinforcing phase is finely divided and the matrix solidifies fine-grained.

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  In-situ Al3Ti particle reinforcement for stiff aluminum die castings
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  ISSN: 0925-8388
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  Formation kinetics and phase stability of in-situ Al3Ti particles in aluminium casting alloys with varying Si content
  In: Results in Materials (2020)
  ISSN: 2590-048X
  DOI: 10.1016/j.rinma.2020.100103
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  Processing of in situ Al3Ti/Al composites by advanced high shear technology: influence of mixing speed
  In: International Journal of Advanced Manufacturing Technology 110 (2020), p. 1589-1599
  ISSN: 0268-3768
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  In situ Al3Ti/Al composites fabricated by high shear technology: microstructure and mechanical properties
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  ISSN: 0267-0836
  DOI: 10.1080/02670836.2019.1677025
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  In-situ Al3Ti/Al composites produced by high shear technology: microstructure and mechanical properties (Dissertation, 2019)
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  Microstructures and Mechanical Properties of Al3Ti/Al Composites Produced In Situ by High Shearing Technology
  In: Advanced Engineering Materials (2018)
  ISSN: 1438-1656
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