Nanoscaled eutectic NiAl-(Cr,Mo) composites with exceptional mechanical properties processed by electron beam melting

Förner, Andreas; Giese, Sven; Arnold, Christopher; Felfer, Peter; Körner, Carolin; Neumeier, Steffen; Göken, Mathias

doi:10.1038/s41598-020-72093-5

Cited by 16 publications

(13 citation statements)

References 41 publications

(60 reference statements)

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“…It can be concluded that a smaller lamella size would increase the fracture toughness. Electron beam melting might be an approach to control the lamella size, as done by Förner et al [ 38 ] In addition, the fracture toughness of the β‐NiAl phase seems to be lower than the interface strength. A ductilization of β‐NiAl can increase the fracture toughness, as the toughening mechanisms can appear at both phase transitions of the crack.…”

Section: Discussionmentioning

confidence: 99%

Microcantilever Fracture Tests on Eutectic NiAl–Cr(Mo) In Situ Composites

et al. 2021

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Lamellar eutectic NiAl–Cr(Mo) alloys show an increased fracture toughness due to different toughening mechanisms. These mechanisms result from the fibrous or lamellar microstructure of the two constituting phases α‐Cr(Mo) and β‐NiAl. However, the fracture toughness of the individual phases and the evolution from early crack growth to the toughening mechanisms have not yet been systematically studied. Herein, bending tests on focused ion beam (FIB)‐notched microcantilever beams are used to characterize the small‐scale fracture properties. The micromechanical investigations reveal that the fracture toughness of the α‐Cr(Mo) phase (7.5−9.1 MPam) is much higher than the fracture toughness of β‐NiAl (2.2−2.9 MPam). Larger cantilevers in the crack arresting orientation show an enhanced fracture toughness with up to 14.4 MPam, which is still lower than the one of macroscopic experiments. This is attributed to the small interaction volume of the crack, which hinders the full exploitation of potential extrinsic toughening mechanisms.

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Section: Discussionmentioning

confidence: 99%

Microcantilever Fracture Tests on Eutectic NiAl–Cr(Mo) In Situ Composites

et al. 2021

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“…[ 14 ] The pre‐heating of the powder bed can cause sintering of powder particles, which can in turn enhance material's electrical conductivity and mechanical stability i.e., reduce residual stresses. [ 15 ] This explains the higher number of publications on E‐PBF printing of non‐weldable alloys such as binary intermetallic compounds, compared to the number of studies using L‐PBF. [ 14 ]…”

Section: Emerging Metals In Ammentioning

confidence: 99%

Emerging Functional Metals in Additive Manufacturing

Moghimian¹,

Poirié²,

Kroeger³

et al. 2023

Adv Eng Mater

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“…Previous studies have already confirmed electron beam remelting to be a suitable process for creating nanostructured in-situ composites, where immiscible eutectic systems are able to form phases smaller than 10 nm. [30] In the case of Nb-Si-Cr, the phases are also in the regime of 10 nm, but their irregular shape prohibits an accurate measurement of phase diameter. For slower scan rates (v = 250 mm/s and v = 125 mm/s), especially the Cr 2 Nb and Nb ss phases are coarser.…”

Section: Phase-specific Analysismentioning

confidence: 99%

“…[29] This study aims towards the creation of a nanostructured and aligned eutectic Nb-10.9Si-28.4Cr in-situ composite like it has been done previously for NiAl-Cr(Mo) in-situ composites. [30] Geng et al…”

Section: Introductionmentioning

confidence: 99%

Nanostructuring of Nb-Si-Cr Alloys by Electron Beam Melting to Improve the Mechanical Properties and the Oxidation Behavior

Förner

Vollhüter

Hausmann

et al. 2021

Metall Mater Trans A

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Materials processed by additive manufacturing often exhibit a very fine-scaled microstructures due to high cooling rates in the process. In this study, single-layer surface electron beam melting is used to create very high cooling rates similar to additive manufacturing processes to investigate the resulting microstructure. In the case of Nb-Si-Cr in-situ composites, a nano-scaled eutectic microstructure is beneficial for improving the mechanical and oxidational properties. Fast solidification results in the formation of supersaturated phases of Nbss and Cr2Nb with phase diameters down to 10 nm as well as in the stabilization of the metastable Nb9(Cr,Si)5 phase at room temperature. After processing with different solidification rates, the decomposition of the Nb9(Cr,Si)5 phase has been studied in detail with atom probe microscopy. The stabilization of mixed silicide phases by electron beam melting shows a new pathway for improving hardness and enhancing oxidation resistance of nanostructured eutectic in-situ composites, by which the inherent weaknesses of Nb-Si-Cr can be overcome without further alloying elements. Graphical Abstract

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Nanoscaled eutectic NiAl-(Cr,Mo) composites with exceptional mechanical properties processed by electron beam melting

Cited by 16 publications

References 41 publications

Microcantilever Fracture Tests on Eutectic NiAl–Cr(Mo) In Situ Composites

Microcantilever Fracture Tests on Eutectic NiAl–Cr(Mo) In Situ Composites

Emerging Functional Metals in Additive Manufacturing

Nanostructuring of Nb-Si-Cr Alloys by Electron Beam Melting to Improve the Mechanical Properties and the Oxidation Behavior

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