Nano-mechanical Characterization of SLM-Fabricated Ti6Al4V Alloy: Etching and Precision

Alireza Dareh Baghi, Reza Ghomashchi, Reza H. Oskouei, Heike Ebendorff-Heidepriem

Research output: Contribution to journalArticlepeer-review

Abstract

Abstract: In this research, we are reporting that the nanoindentation results vary between etched and unetched SLM-fabricated titanium alloy (Ti6Al4V) in spite of the same microhardness values. The dimensionless roughness parameter α, as a metric for the sensitivity of nano-hardness values on the surface roughness, is used to highlight whether etching plays any role. Although the value of α for both samples is below the recommended maximum value, the effect of etching is still significant. The hypothesis for a 19% increase in nano-hardness of etched samples is also discussed in this paper. Furthermore, the maximum proposed value of α (α < 0.05) appeared to be invalid for SLM-fabricated titanium and a lower value of α may need to be proposed as a critical value.

Original languageEnglish
Pages (from-to)749-756
Number of pages8
JournalMetallography, Microstructure, and Analysis
Volume8
Issue number5
DOIs
Publication statusPublished - 1 Oct 2019

Keywords

  • Nanoindentation
  • Microindentation
  • Titanium alloys
  • Selective laser melting (SLM)

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