The mechanical properties and the deformation microstructures of the C15 Laves phase Cr2Nb at high temperatures

AV Kazantzis, Mark Aindow, Ian Jones, GK Triantafyllidis, JTM de Hosson

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71 Citations (Scopus)

Abstract

Compression tests between 1250 and 1550 degrees C and 10(-5) and 5 x 10(-3) s(-1) and transmission electron microscopy have been employed to investigate the high temperature mechanical properties and the deformation mechanisms of the C15 Cr2Nb Laves phase. The stress-peaks in the compression curves during yielding were explained using a mechanism similar to strain aging combined with a low initial density of mobile dislocations. The primary deformation mechanism is slip by extended dislocations with Burgers vector 1/2 <110 >, whereas twinning is more frequent at 10(-4) s(-1). Schmid factor analysis indicated that twinning is more probable in grains oriented so as to have two co-planar twinning systems with high and comparable resolved shear stresses. Twinning produced very anisotropic microstructures. This may be due to synchroshear: a self-pinning mechanism which requires co-operative motion of zonal dislocations. (c) 2006 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
Original languageEnglish
Pages (from-to)1873-1884
Number of pages12
JournalActa Materialia
Volume55
Issue number6
DOIs
Publication statusPublished - 1 Apr 2007

Keywords

  • transmission electron microscopy (TEM)
  • high temperature deformation
  • mechanical properties testing
  • laves phases
  • compression test

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