Interface structure and chemistry in a novel steel-based composite Fe-TiB 2 obtained by eutectic solidification

Limei Cha, Sylvie Lartigue-Korinek*, Michael Walls, Leo Mazerolles

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

44 Scopus citations

Abstract

A new generation of steels, Fe-TiB 2 composites, is designed for automotive applications. The product displays both a high stiffness and a low density in comparison with existing steels and is prepared by eutectic solidification directly from the melt. A homogeneous distribution of TiB 2 particles is achieved. The structure and chemistry of the internal interfaces will clearly determine the quality of interfacial cohesion during processing and further loading. Here, fundamental investigations at the atomic level are performed by transmission electron microscopy. The preferred interface planes for diboride particles are prismatic {101̄0} planes (in the majority) and the basal plane. No second phase is detected at prismatic planes. Basal type interfaces appear more or less covered by TiC particles, which are also present in the bulk and at iron grain boundaries. The interfacial crystallography and defects are accurately determined. Our results strongly support the good interfacial cohesion assumed for this novel steel-based composite displaying enhanced mechanical behaviour.

Original languageEnglish
Pages (from-to)6382-6389
Number of pages8
JournalActa Materialia
Volume60
Issue number18
DOIs
StatePublished - Oct 2012
Externally publishedYes

Keywords

  • Atomic level
  • Composite
  • Fe-TiB
  • Interfaces
  • Transmission electron microscopy

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