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In situ imaging of precipitate formation in additively manufactured al-alloys by scanning X-ray fluorescence

Lazar, Isac LU orcid ; Mehta, Bharat ; Bertschová, Vendulka ; Malladi, Sri Bala Aditya ; Ren, Zhe LU ; Das, Srashtasrita ; Hagemann, Johannes ; Falkenberg, Gerald ; Frisk, Karin and Mikkelsen, Anders LU , et al. (2024) In European Journal of Materials 4(1).
Abstract

Al-alloys incorporating Mn, Cr and Zr, tailored for powder bed fusion-laser beam processes with solubilities three times equilibrium have recently been developed that yield a high strength. Mn and Cr-enriched precipitates that form during printing and heat treatment influence the material’s mechanical properties hence making it important to understand their kinetics. In this study, direct imaging of these precipitates was accomplished through the utilisation of in situ synchrotron-based scanning X-ray fluorescence. During heat treatment, a selective accumulation of Cr and Mn in two distinct types of precipitates at grain boundaries was observed. Additionally, the microstructure at the melt-pool boundary, containing precipitates found in... (More)

Al-alloys incorporating Mn, Cr and Zr, tailored for powder bed fusion-laser beam processes with solubilities three times equilibrium have recently been developed that yield a high strength. Mn and Cr-enriched precipitates that form during printing and heat treatment influence the material’s mechanical properties hence making it important to understand their kinetics. In this study, direct imaging of these precipitates was accomplished through the utilisation of in situ synchrotron-based scanning X-ray fluorescence. During heat treatment, a selective accumulation of Cr and Mn in two distinct types of precipitates at grain boundaries was observed. Additionally, the microstructure at the melt-pool boundary, containing precipitates found in the as-printed state, remains thermally stable during the heat treatment. Both these results shed light on the active role Cr plays in the precipitation kinetics of the material. The study also demonstrates the significant value of employing high-sensitivity in-situ X-ray fluorescence microscopy in exploring the kinetics of sub-micrometre scale precipitation.

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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
Aluminium alloys, in-situ, powder bed fusion-laser beam, precipitation, synchrotron, X-ray fluorescence imaging
in
European Journal of Materials
volume
4
issue
1
article number
2328242
external identifiers
  • scopus:85188598860
ISSN
2688-9277
DOI
10.1080/26889277.2024.2328242
language
English
LU publication?
yes
id
f2053f6d-076e-4f6b-a05e-fd638a8f4b3b
date added to LUP
2024-04-15 12:37:39
date last changed
2024-04-17 11:12:06
@article{f2053f6d-076e-4f6b-a05e-fd638a8f4b3b,
  abstract     = {{<p>Al-alloys incorporating Mn, Cr and Zr, tailored for powder bed fusion-laser beam processes with solubilities three times equilibrium have recently been developed that yield a high strength. Mn and Cr-enriched precipitates that form during printing and heat treatment influence the material’s mechanical properties hence making it important to understand their kinetics. In this study, direct imaging of these precipitates was accomplished through the utilisation of in situ synchrotron-based scanning X-ray fluorescence. During heat treatment, a selective accumulation of Cr and Mn in two distinct types of precipitates at grain boundaries was observed. Additionally, the microstructure at the melt-pool boundary, containing precipitates found in the as-printed state, remains thermally stable during the heat treatment. Both these results shed light on the active role Cr plays in the precipitation kinetics of the material. The study also demonstrates the significant value of employing high-sensitivity in-situ X-ray fluorescence microscopy in exploring the kinetics of sub-micrometre scale precipitation.</p>}},
  author       = {{Lazar, Isac and Mehta, Bharat and Bertschová, Vendulka and Malladi, Sri Bala Aditya and Ren, Zhe and Das, Srashtasrita and Hagemann, Johannes and Falkenberg, Gerald and Frisk, Karin and Mikkelsen, Anders and Nyborg, Lars}},
  issn         = {{2688-9277}},
  keywords     = {{Aluminium alloys; in-situ; powder bed fusion-laser beam; precipitation; synchrotron; X-ray fluorescence imaging}},
  language     = {{eng}},
  number       = {{1}},
  series       = {{European Journal of Materials}},
  title        = {{In situ imaging of precipitate formation in additively manufactured al-alloys by scanning X-ray fluorescence}},
  url          = {{http://dx.doi.org/10.1080/26889277.2024.2328242}},
  doi          = {{10.1080/26889277.2024.2328242}},
  volume       = {{4}},
  year         = {{2024}},
}