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@ARTICLE{Turnali:637350,
      author       = {Turnali, Ahmet and Hariharan, Avinash and Polatidis,
                      Efthymios and Peter, Nicolas J. and Gehlmann, Jaqueline and
                      Sofras, Christos and Hegedüs, Zoltan and Sayk, Lennart and
                      Allam, Tarek and Schleifenbaum, Johannes Henrich and Haase,
                      Christian},
      title        = {{H}arnessing additive manufacturing-induced microstructure
                      and solute heterogeneities for the design of
                      precipitation-strengthened alloys},
      journal      = {Acta materialia},
      volume       = {298},
      issn         = {1359-6454},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {PUBDB-2025-03842},
      pages        = {121423},
      year         = {2025},
      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.},
      cin          = {FS DOOR-User / FS-PET-D},
      ddc          = {670},
      cid          = {$I:(DE-H253)FS_DOOR-User-20241023$ /
                      I:(DE-H253)FS-PET-D-20190712},
      pnm          = {632 - Materials – Quantum, Complex and Functional
                      Materials (POF4-632) / 6G3 - PETRA III (DESY) (POF4-6G3) /
                      FS-Proposal: I-20220679 EC (I-20220679-EC) / BMBF 03XP0264 -
                      MatAM - Design additiv gefertigter Hochleistungsmaterialien
                      für die Automobilindustrie (BMBF-03XP0264) / HeteroGenius4D
                      - Heterogeneities-guided alloy design by and for 4D printing
                      (101077977)},
      pid          = {G:(DE-HGF)POF4-632 / G:(DE-HGF)POF4-6G3 /
                      G:(DE-H253)I-20220679-EC / G:(DE-82)BMBF-03XP0264 /
                      G:(EU-Grant)101077977},
      experiment   = {EXP:(DE-H253)P-P21.2-20150101},
      typ          = {PUB:(DE-HGF)16},
      doi          = {10.1016/j.actamat.2025.121423},
      url          = {https://bib-pubdb1.desy.de/record/637350},
}