Laves phase intermetallic matrix composite in situ toughened by ductile precipitates

Alexander J. Knowles*, Ayan Bhowmik, Surajit Purkayastha, Nicholas G. Jones, Finn Giuliani, William J. Clegg, David Dye, Howard J. Stone

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)


Laves phase based materials are of interest for elevated temperature applications for their high melting points and strengths but are critically limited by their low fracture toughness. Here, a Laves phase intermetallic matrix composite toughened by ductile precipitates has been studied. This microstructure was produced in situ by heat treating a Fe2(Mo,Ti) based alloy to precipitate ∼ 12% volume fraction of fine ∼ 250 nm bcc, A2 (Mo,Ti), phase, with an orientation relationship of [100]C14//[113]A2,[010]C14//[11¯1¯]A2,[001]C14//[121¯]A2. The precipitated A2 phase increased the indentation fracture toughness from 1.1 to 2.2 MPa m1/2 while maintaining a high hardness of HV0.5 = 8.9 GPa similar to monolithic Laves phases.

Original languageEnglish
Pages (from-to)59-62
Number of pages4
JournalScripta Materialia
Early online date14 Jul 2017
Publication statusPublished - 1 Nov 2017


  • Composites
  • Intermetallics
  • Mechanical properties
  • Orientation relationship
  • Precipitation

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics


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