Journal Article

PUBDB-2025-03842

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Harnessing additive manufacturing-induced microstructure and solute heterogeneities for the design of precipitation-strengthened alloys

Turnali, A. (Corresponding author)Extern* ; Hariharan, A.Extern* ; Polatidis, E.Extern* ; Peter, N. J.Extern* ; Gehlmann, J. ; Sofras, C.Extern* ; Hegedüs, Z.DESY* ; Sayk, L. ; Allam, T. ; Schleifenbaum, J. H. ; Haase, C.

2025
Elsevier Science Amsterdam [u.a.]

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Please use a persistent id in citations: doi:10.1016/j.actamat.2025.121423  doi:10.3204/PUBDB-2025-03842

Abstract: Solute enrichment at lattice defects is a well-established phenomenon for promoting phase transformations. Metal additive manufacturing (AM) inherently enables this by promoting cellular structures during solidification and thermal cycling. Cellular structures exhibit compositional and lattice defect density variations between cell cores and boundaries, leading to site-specific phase-transformation (e.g., precipitation) behavior that can be selectively activated by post-AM heat treatments. Despite this potential, cellular structures have largely been treated as byproducts rather than intentionally exploited alloy design features. Guided by these insights, we designed a model Al10.5Co25Fe39.5Ni25 multi-principal element alloy to intentionally control composition and thus, precipitation driving forces across cellular structures. The alloy composition was computationally selected to promote segregation of a fast-diffusing, precipitate-forming element into the interdendritic regions during solidification in the laser powder bed fusion (PBF-LB/M) process. This segregation aligned with dislocation walls at cell boundaries, creating a “pre-conditioned” state with enhanced chemical driving force and reduced nucleation barrier for precipitation. This targeted design enabled site-specific nucleation and growth of precipitates at cell boundaries during aging. Comprehensive multiscale characterization complemented by in situ synchrotron X-ray diffraction confirmed that cellular structures accelerated precipitation, increased precipitate volume fraction and refined the precipitate size compared to the reference state where cellular structures were removed via solution annealing before aging. As a result, the alloy achieved enhanced yield strength (122.2 % increase), and improved tensile properties compared to the reference state. These findings demonstrate the potential of harnessing cellular structures as functional components to control microstructure evolution in precipitation strengthened AM alloys.

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Contributing Institute(s):

1. FS DOOR-User (FS DOOR-User)
2. Experimentebetreuung PETRA III (FS-PET-D)

Research Program(s):

1. 632 - Materials – Quantum, Complex and Functional Materials (POF4-632) (POF4-632)
2. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)
3. FS-Proposal: I-20220679 EC (I-20220679-EC) (I-20220679-EC)
4. BMBF 03XP0264 - MatAM - Design additiv gefertigter Hochleistungsmaterialien für die Automobilindustrie (BMBF-03XP0264) (BMBF-03XP0264)
5. HeteroGenius4D - Heterogeneities-guided alloy design by and for 4D printing (101077977) (101077977)

Experiment(s):

1. PETRA Beamline P21.2 (PETRA III)

Appears in the scientific report 2025

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF >= 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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