Directed energy deposition of AA7075 - effect of TiC nanoparticles on microstructure

Lucia Cobian Gonzalez, Jari Tuominen, Shahroz Ahmed, Madan Patnamsetty, Pasi Peura

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AA7075 alloy is a high-strength aluminum alloy with properties enhanced by heat treatments. However, like most high-strength aluminum alloys, AA7075 is non-weldable, as it suffers from hot cracking when it is welded or additively manufactured with fusion techniques. A proposed way to reduce the hot cracking tendency is by refining the microstructure by adding nucleation enhancers. In this study, AA7075 powder feedstock was functionalized with 1.7 and 3.4 vol.% TiC nanoparticles, printed with laser-directed energy deposition (DED), subjected to T6 heat treatment, and characterized with optical and electron microscopy, electron backscatter diffraction (EBSD), and hardness measurements. Although TiC was not homogeneously distributed in the aluminum matrix, the addition of TiC successfully suppressed hot cracking by inhibiting dendritic growth produced by increased and more uniform nucleation, which resulted in refined equiaxed grains, and thus enhanced the printability of the material.
Original languageEnglish
Article number100341
Number of pages11
JournalResults in Materials
Early online date19 Oct 2022
Publication statusPublished - 2022
Publication typeA1 Journal article-refereed


  • AA7075
  • laser-DED
  • nucleation enhancers
  • post-heat treatment
  • microstructure
  • additive manufacturing
  • Directed energy deposition

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