Micropillar compression of Ti(C,N)-FeNi cermets: Microstructural, processing, and scale effects Articles uri icon

authors

  • BESHARATLOO, H.
  • NICOLAS MORILLAS, MARIA DE
  • CHEN, M.
  • MATEO, A.
  • FERRARI, B
  • GORDO ODERIZ, ELENA
  • JIMENEZ PIQUE, E.
  • WHEELER, J.M.
  • LLANES, L.

publication date

  • July 2023

start page

  • 2826

end page

  • 2833

issue

  • 7

volume

  • 43

International Standard Serial Number (ISSN)

  • 0955-2219

Electronic International Standard Serial Number (EISSN)

  • 1873-619X

abstract

  • The influence of microstructure and processing route on the small-scale mechanical response as well as on the deformation and failure mechanisms of Ti(C,N)-FeNi cermets were investigated by uniaxial compression of micropillars milled by focused ion beam with different sizes. Stress-strain curves were determined and associated deformation mechanisms were observed in-situ using scanning electron microscopy. The appropriate micropillars dimension was assessed, based on the microstructural characteristics of studied cermets, to overcome scale effect issues. A direct relationship was observed between yield strength and ceramic/metal ratio for colloidal samples. Meanwhile, deformation of metallic binder and glide between Ti(C,N)/Ti(C,N) particles were evidenced as dominant mechanisms during the compression for colloidal cermets with 70 and 80 vol% of ceramic phase, respectively. The obtained results illustrate that samples processed from powder attained by colloidal route provide superior mechanical behavior, as compared to that exhibited by specimens shaped following a conventional powder metallurgy one (wet ball-milling/drying).

subjects

  • Chemistry

keywords

  • cermet; deformation mechanisms; micropillar; powder metallurgy; uniaxial compression