Ordnungsphasenbildung im System FeCoMo

Translated title of the contribution: Ordering behavior in the system FeCoMo

Christin Aumayr

Research output: ThesisDiploma Thesis

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The alloy Fe - 25 m% Co - 15 m% Mo is a carbon-free iron-based alloy. It shows a high hardness combined with an enhanced thermal stability due to the precipitation of an intermetallic µ-phase (Fe,Co)7Mo6. However, below the γ↔α transformation temperature the FeCo-matrix exhibits a reversible order transition from the disordered bcc A2-lattice to the ordered B2-lattice, which deteriorates the ductility of the material. In the present study the influence of alloying elements on the B2-ordering transition in the FeCoMo system was investigated. The mechanical properties were characterized by means of impact testing and hardness measurements. The alloy design combined with well-defined heat treatments led to a significant increase in ductility, but to a decrease in hardness. Additionally, the influence of alloying elements on the aging behavior was examined. It was shown that the addition of alloying elements substantially affects the µ-phase precipitation behavior.
Translated title of the contributionOrdering behavior in the system FeCoMo
Original languageGerman
  • Turk, Christoph, Co-Supervisor (internal)
  • Leitner, Harald, Supervisor (external)
  • Clemens, Helmut, Supervisor (internal)
  • Schemmel, Ingrid, Co-Supervisor (external), External person
Award date30 Oct 2015
Publication statusPublished - 2015

Bibliographical note

embargoed until 01-09-2020


  • Fe-25Co-15Mo
  • The ternary alloy FeCoMo/W
  • µ-Phase
  • Precipitation hardening
  • Disorder-order transition

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