Dispersion-Strengthened Materials

© Fraunhofer IFAM Dresden
Hardness after tempering (1 h heat treatment time) of a dispersion-strengthened Cu alloy in comparison to conventional Cu materials

As an objective in the development of dispersion strengthened materials, heat and creep resistance have to be enhanced thereby simultaneously maintaining typical properties of the metallic basic matrix (e.g. thermal conductivity, corrosion resistance). Thus, only a very few rate of the volume for the disperse secondary phase (about <5 volume percent, as a rule oxides, carbides, nitrides) has to be imparted at a low size (dispersoid size <100 nm). At Fraunhofer IFAM Dresden, dispersion solidified materials are developed by means of powder metallurgical technologies. High-energy grinding is suited to embed nanometer sized dispersoids into metallic matrices. The powders can be processed either in various lab mills or - in greater quantities - on a centrifugal oscillatory mill. Manufacture of the semi-finished material is supported by pressure upon high-temperature isostatic pressing or dispersion.

Taking dispersion strengthened copper, the combination of high conductivity and high temperature or creep resistance could be evidenced. (see TEM image and diagram below)

Material Examples

Brittle-Ductile Transition of an ODS-Fe Alloy for the Use in Power Engineering
© Fraunhofer IFAM Dresden
Brittle-Ductile Transition of an ODS-Fe Alloy for the Use in Power Engineering
  • DS-Cu alloys, e.g. for welding technology applications
  • DS-Ni alloys e.g. for high temperature and corrosively loaded components in automobile and aircraft construction
  • DS-Fe alloys, e.g. for high temperature loaded components in energy technology (nuclear technology, nuclear fusion)

Service Portfolio

© Fraunhofer IFAM Dresden
Electron Energy Loss Spectroscopy (EELS), recorded at the TEM (dE=50eV, TiM2,3 edge), of a DS-Cu alloy (white particles: TiC dispersoide)
  • Development of dispersion strengthened materials with different metal matrices and reinforcing particles
  • Technology development
  • Material characterization
  • Consulting and research on the use of dispersion strengthened materials