Journal Article

PUBDB-2022-07429

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Microstructure evolution in the hypo-eutectic alloy Al$_{0.75}$CrFeNi$_{2.1}$ manufactured by laser powder bed fusion and subsequent annealing

Hecht, U. (Corresponding author)Extern* ; Vayyala, A. ; Barriobero Vila, P.Extern* ; Navaeilavasani, N. ; Gein, S. ; Cazic, I. ; Mayer, J.

2022
Elsevier Amsterdam

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Please use a persistent id in citations: doi:10.1016/j.msea.2022.144315  doi:10.3204/PUBDB-2022-07429

Abstract: The hypo-eutectic medium entropy alloy Al$_{0.75}$CrFeNi$_{2.1}$ was processed by laser powder bed fusion (LPBF). The off-equilibrium solidification conditions prohibited coupled eutectic growth. Instead, the primary face centered cubic phase A1(FCC) solidified with a cellular morphology and the body centered, initially ordered B2(BCC) phase formed as a thin intercellular envelope. During post-build annealing an ultrafine quasi-lamellar pattern evolved following BCC growth and coarsening. The novel solid state transformation from cellular to lamellar morphology was attributed to a pronounced anisotropy of the FCC|BCC phase boundary energy. Microstructure evolution was also studied during continuous heating using in situ high-energy synchrotron X-ray diffraction (HEXRD) carried out at the beamline P07-HEMS of PETRA III (German Electron Synchrotron, DESY). The ultrafine and nano-scale features of the microstructure were quantitatively analyzed by atom probe tomography (APT) in the as-built condition and after isothermal annealing at 950 °C. The benefits of LPBF processing were discussed on the basis of mechanical properties measured by 3-point bending. The estimated tensile properties after annealing at 950 °C/6 h reached YS ≈ 860 MPa, UTS ≈1384 MPa with an elongation at fracture of ≈11%. Tensile properties in the as-built condition were comparable to martensitic steels.

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Contributing Institute(s):

1. DOOR-User (DOOR ; HAS-User)

Research Program(s):

1. 6G3 - PETRA III (DESY) (POF4-6G3) (POF4-6G3)
2. FS-Proposal: I-20210694 (I-20210694) (I-20210694)

Experiment(s):

1. PETRA Beamline P07 (PETRA III)

Appears in the scientific report 2022

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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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