Selective laser melting of AlCu-TiB2 alloy using pulsed wave laseremission mode: processability, microstructure andmechanical properties

Carlo Alberto Biffi, Paola Bassani, Jacopo Fiocchi*, Mihaela Albu, Ausonio Tuissi

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

The present work explores the processability of an advanced aluminum alloy, namely AlCu-TiB 2, by selective laser melting (SLM), and the correlation between microstructure and mechanical properties of as built specimens. The principal process parameters of the laser emission in pulsed wave (PW) mode, namely laser power and exposure time, were varied to achieve full density parts starting from prealloyed powders. Detailed analysis of defects in the highest relative density conditions was performed thzrough X-ray computed tomography. It was found that the highest relative density, up to 99.5%, was achieved at a laser energy density of 82 J/mm 3. Microstructure of as-built specimens was analyzed through scanning electron microscopy, coupled with EDX and EBSD analyses, and transmission electron microscopy. The as-built microstructure was considerably uniform, and characterized by fine equiaxed grains, decorated with micrometric and nanometric second phases and an even distribution of reinforcing TiB 2 particles; no epitaxial grain growth was observed. Finally, tensile behaviour of the as-built specimens indicates a yield and ultimate tensile stress of 325 MPa and 395 MPa, respectively, combined with an elongation of 13%. The low work hardening rate and jerky flow characterizing plastic deformation are analyzed and discussed.

Original languageEnglish
Article number109628
Number of pages11
JournalMaterials & Design
Volume204
DOIs
Publication statusPublished - 2021

Keywords

  • Al-Cu-TiB alloy
  • EBSD
  • Microstructure
  • Processability
  • Selective laser melting
  • TEM

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

Fields of Expertise

  • Advanced Materials Science

Treatment code (Nähere Zuordnung)

  • Basic - Fundamental (Grundlagenforschung)

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