Architectural effect on 3D elastic properties and anisotropy of cubic lattice structures

Lohmuller, Paul; Favre, Jean-Michel; Kenzari, Samuel; Piotrowski, Boris; Peltier, Laurent; Laheurte, Pascal

doi:10.1016/j.matdes.2019.108059

Cited by 35 publications

(12 citation statements)

References 30 publications

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“…% the effects on the local garnet structures were minimal with slight structural distortions propagating through the entire lattice. 11 Although such effects of Ce on the YAG lattice may also contribute to elastic softening, 49 the distortions of local lattice structures are spatially far too small (~ Å) to be probed directly by ultrasound excitations. 18,41,48 Thus, the resulting downshifts in the low-frequency range could not originate from such effects (unless these effects manifest in microstructural differences between the Ce:YAG samples).…”

Section: Resultsmentioning

confidence: 99%

Elastic and thermodynamic properties of cerium‐doped yttrium aluminum garnets

et al. 2021

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Cerium-doped yttrium aluminum garnets (Y 3-x Ce x Al 5 O 12 , Ce:YAGs) are promising yellow light-emitting components of solid-state white light-emitting diodes. Although there have been numerous studies examining the effects of Ce concentrations on the luminescent properties of Y 3-x Ce x Al 5 O 12, the impacts of Ce dopant on the elastic and thermodynamic properties are not well understood. In this work, we used resonant ultrasound spectroscopy (RUS) to determine the effects of Ce doping (0.025, 0.1, 1 at. %) on the elastic and thermodynamic properties of Y 3-x Ce x Al 5 O 12 . The elastic moduli calculated via the Voigt-Reuss-Hill (VRH) method demonstrated that low Ce dopant concentrations (≤0.1 at. %) induced negligible effects on the elasticity of the YAG host matrix, while a high Ce concentration (1 at. %) yielded significant softening.RUS spectral analysis and SEM images suggested that the elastic softening originated from microstructural differences induced at higher Ce dopant concentrations.In addition, we demonstrated an increase in elastic anisotropy at higher Ce concentrations, which further elucidated the correlations between structure and elasticity of Y 3x Ce x Al 5 O 12 . Debye temperatures (θ D ), heat capacities (C p ), and thermal conductivities (κ) were calculated for Ce:YAGs through the relations of RUS-derived parameters (sound velocities, elastic moduli) and previously determined thermal expansion coefficients. Ce:YAG was found to have a significant reduction in θ D , C p , and κ at Ce concentrations ≥1 at. %. Lastly, extrapolation of C p and κ to higher temperatures allowed the modeling of thermal stress experienced by Y 3-x Ce x Al 5 O 12 disks up to 1073.15 K.

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Section: Resultsmentioning

confidence: 99%

Elastic and thermodynamic properties of cerium‐doped yttrium aluminum garnets

et al. 2021

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“…Cellular lattices are characterized by an interconnected solid scaffold configuration, showing high specific strength and very low relative density 1 , 2 . As a result, this class of materials is being considered for a wide range of potential applications across transportation (e.g.…”

Section: Introductionmentioning

confidence: 99%

Macro-, meso- and microstructural characterization of metallic lattice structures manufactured by additive manufacturing assisted investment casting

Carneiro

Rawson

Puga

et al. 2021

Sci Rep

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Cellular materials are recognized for their high specific mechanical properties, making them desirable in ultra-lightweight applications. Periodic lattices have tunable properties and may be manufactured by metallic additive manufacturing (AM) techniques. However, AM can lead to issues with un-melted powder, macro/micro porosity, dimensional control and heterogeneous microstructures. This study overcomes these problems through a novel technique, combining additive manufacturing and investment casting to produce detailed investment cast lattice structures. Fused filament fabrication is used to fabricate a pattern used as the mold for the investment casting of aluminium A356 alloy into high-conformity thin-ribbed (~ 0.6 mm thickness) scaffolds. X-ray micro-computed tomography (CT) is used to characterize macro- and meso-scale defects. Optical and scanning electron (SEM) microscopies are used to characterize the microstructure of the cast structures. Slight dimensional (macroscale) variations originate from the 3D printing of the pattern. At the mesoscale, the casting process introduces very fine (~ 3 µm) porosity, along with small numbers of (~ 25 µm) gas entrapment defects in the horizontal struts. At a microstructural level, both the (~ 70 μm) globular/dendritic grains and secondary phases show no significant variations across the lattices. This method is a promising alternative means for producing highly detailed non-stochastic metallic cellular lattices and offers scope for further improvement through refinement of filament fabrication.

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“…Powder Bed Fusion of Metals using a Laser Beam (PBF-LB/M) enables the production of geometrically complex parts [1]. In the PBF-LB/M process, a laser irradiates the cross section of a component in a powder layer.…”

Section: Introduction and State Of The Artmentioning

confidence: 99%

In situ alloying: investigation of the melt pool stability during powder bed fusion of metals using a laser beam in a novel experimental set-up

et al. 2021

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The limited access to materials for the Powder Bed Fusion of Metals using a Laser Beam (PBF-LB/M) is compensated by in situ alloying. Individual melt pool characteristics can be specifically influenced to improve the mechanical properties of the final part. However, conventional PBF-LB/M machines allow only limited access for detailed observation of the process zone and, in particular, the melt pool. This paper presents a methodology for systematically analyzing the melt pool in the cross section to determine the in situ variation of the melt pool depth. A custom PBF-LB/M test bench was devised to enable investigation of the process zone using high-speed infrared cameras. The image data were processed automatically using a dedicated algorithm. The methodology was applied to analyze the effect of additives on the melt pool stability. Stainless steel 316L powder was blended with the aluminum alloy AlSi10Mg by up to 20 wt.%. It was found that the blended powder significantly reduced the variation of the melt pool depth.

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Architectural effect on 3D elastic properties and anisotropy of cubic lattice structures

Cited by 35 publications

References 30 publications

Elastic and thermodynamic properties of cerium‐doped yttrium aluminum garnets

Elastic and thermodynamic properties of cerium‐doped yttrium aluminum garnets

Macro-, meso- and microstructural characterization of metallic lattice structures manufactured by additive manufacturing assisted investment casting

In situ alloying: investigation of the melt pool stability during powder bed fusion of metals using a laser beam in a novel experimental set-up

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