Microstructure, tensile properties of SLMed TNT5Zr-0.2O alloys without/with keyholes produced by different Post-processing treatments

Weihuan Kong, Qi Shi, Sophie C. Cox, Min Kuang, Moataz M. Attallah

Research output: Contribution to journalArticlepeer-review

Abstract

Ti-34Nb-13Ta-5Zr-0.2O alloy (hereafter termed TNT5Zr-0.2O) with keyhole defects was fabricated by SLM. The microstructure and tensile properties have been investigated after two post-processing treatments, namely vacuum heat treatment (HT) and hot isostatic pressing (HIP). Microstructure shows both alloys retain beta grain matrix along with discrete nano-sized grain boundary alpha precipitates. The stress concentrations at the edge of keyholes make the voids wall collapse under tension and cracks propagate more easily in that region. Notably, the pore enclosure by HIP is not contribute to a better ductility of this alloy. This explains why the TNT5Zr-0.2O-HT alloy possesses lower UTS (978 ± 19 MPa) and elastic modulus (49 ± 3 GPa), but higher elongation (4.5% ± 0.6%) in comparison with TNT5Zr-0.2O-HIP sample.

Original languageEnglish
Article number131448
JournalMaterials Letters
Volume309
Early online date8 Dec 2021
DOIs
Publication statusPublished - 15 Feb 2022

Bibliographical note

Funding Information:
MMA acknowledges the financial support for work provided by Institute of New Materials, Guangdong Academy of Sciences (PI: MMA, grant: 17-0551).

Keywords

  • Beta Ti alloy
  • Keyhole
  • Microstructure
  • Selective laser melting
  • Tensile properties

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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