Structure-property relationships in a CoCrMo alloy at micro and nano-scales

R. Ahmed, H. L. de Villiers Lovelock, N. H. Faisal, S. Davies

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

This investigation considered the multiscale tribo-mechanical evaluations of CoCrMo (Stellite(R)21) alloys manufactured via two different processing routes of casting and HIP-consolidation from powder (Hot Isostatic Pressing). These involved hardness, nanoscratch, impact toughness, abrasive wear and sliding wear evaluations using pin-on-disc and ball-on-flat tests. HIPing improved the nanoscratch and ball-on-flat sliding wear performance due to higher hardness and work-hardening rate of the metal matrix. The cast alloy however exhibited superior abrasive wear and self-mated pin-on-disc wear performance. The tribological properties were more strongly influenced by the CoCr matrix, which is demonstrated in nanoscratch analysis. (C) 2014 Elsevier Ltd. All rights reserved.

Original languageEnglish
Pages (from-to)98-114
Number of pages17
JournalTribology International
Volume80
DOIs
Publication statusPublished - Dec 2014

Keywords

  • Nanotribology
  • Nanoscratch
  • Wear
  • Manufacturing
  • CO-CR-MO
  • COBALT-BASE ALLOYS
  • STELLITE HARDFACING ALLOYS
  • MECHANICAL-PROPERTIES
  • TENSILE PROPERTIES
  • SURGICAL IMPLANTS
  • WEAR-RESISTANCE
  • HEAT-TREATMENT
  • ABRASIVE WEAR
  • MICROSTRUCTURE

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