Microstructure evolution during in-situ heating of Alsi10Mg alloy powders and additive manufactured parts

Mihaela Albu*, Robert Krisper, Judith Lammer, Gerald Kothleitner, Jacopo Fiocchi, Paola Bassani

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Micro- and nanostructure investigations of AlSi10Mg alloy powders and additive manufactured samples were performed to highlight common effects related to very fast local cooling rates during production. We refer to the homogenously dispersed Si(Mg) nanoparticles and the presence of interconnected amorphous phases in the coral-like eutectic Si network and their evolution upon in-situ heating in scanning transmission electron microscope. The in-situ heating experiments showed as first phenomenon at lower temperatures the crystallization of the eventually present amorphous silicon, while at temperatures above 240 °C coarsening into spherical crystalline particles and network breakage prevail. In addition, the Si nanoparticles evolved, mainly changing their shape and coherence with the matrix. These findings correlate with results from macroscopic investigations (DSC, in-situ XRD), where they further contribute to explain the retrieved exothermic signals by linking them to the respective crystallization of the amorphous Si network, the coarsening of the finely dispersed Si nanocrystals and network breakage.
Original languageEnglish
Article number101605
Number of pages11
JournalAdditive Manufacturing
Volume36
DOIs
Publication statusPublished - 2020

Keywords

  • Additive manufacturing
  • AlSi10Mg
  • DSC
  • HR-TEM
  • In-situ HR-TEM
  • In-situ XRD
  • Powder

ASJC Scopus subject areas

  • Materials Science(all)
  • Engineering (miscellaneous)
  • Industrial and Manufacturing Engineering
  • Biomedical Engineering

Fields of Expertise

  • Advanced Materials Science

Treatment code (Nähere Zuordnung)

  • Basic - Fundamental (Grundlagenforschung)

Fingerprint

Dive into the research topics of 'Microstructure evolution during in-situ heating of Alsi10Mg alloy powders and additive manufactured parts'. Together they form a unique fingerprint.

Cite this