Laves phase intermetallic matrix composite in situ toughened by ductile precipitates

Research output: Contribution to journalArticlepeer-review

Authors

  • Ayan Bhowmik
  • Surajit Purkayastha
  • Nicholas G. Jones
  • Finn Giuliani
  • William J. Clegg
  • David Dye
  • Howard J. Stone

Colleges, School and Institutes

External organisations

  • University of Cambridge
  • Imperial College London

Abstract

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.

Details

Original languageEnglish
Pages (from-to)59-62
Number of pages4
JournalScripta Materialia
Volume140
Early online date14 Jul 2017
Publication statusPublished - 1 Nov 2017

Keywords

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