Creep of replicated microcellular aluminium

Soubielle, Sébastien; Diologent, Frédéric; Salvo, Luc; Mortensen, Alicja

doi:10.1016/j.actamat.2010.09.037

Cited by 19 publications

(5 citation statements)

References 40 publications

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“…For example, nanoporous gold exhibits ligaments which, because they are dislocation-free, are brittle, unlike bulk or micro-porous gold 62 . In another example, as the oxide layer forming on most metals (e.g., sub-micron is thickness) displays a thickness comparable to that of submicron metallic struts, the oxide must be taken into account into prediction of the properties of the porous metal 63 (e.g., its higher stiffness will stiffen it, its high strength will strengthen it). In a third example, if struts or walls of the porous metals are smaller than the grain size, they become mono- or oligocrystalline, thus showing anisotropic mechanical and thermal properties 64 .…”

Section: Pore Size Effectsmentioning

confidence: 99%

Introduction - Porous Metals: From Nano to Macro

et al. 2020

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Historically, porous metals have focused on structural applications where specific stiffness and strength were optimized, using conventional casting, sintering, cutting, machining and joining techniques to create ductile and strong porous metallic structure. For such load-bearing applications, porous metals are studied and used in many sectors, e.g., transportation, architecture, and medicine (for bone-replacement implants). This special issue of the Journal of Materials Research contains articles that were accepted in response to an invitation for manuscripts.

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Section: Pore Size Effectsmentioning

confidence: 99%

Introduction - Porous Metals: From Nano to Macro

et al. 2020

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“…It also performs well when confronted with steady-state creep data of replicated microcellular metal, as shown elsewhere [37,48,49].…”

Section: Scaling Of the Flow Stressmentioning

confidence: 88%

Influence of microstructural heterogeneity on the scaling between flow stress and relative density in microcellular Al–4.5 %Cu

2014

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We explore the influence of the metal microstructure on the compressive flow stress of replicated microcellular 400 µm pore size Al-4.5wt%Cu solidified at two different solidification cooling rates, in as-cast and T6 conditions. It is found that the yield strength roughly doubles with age-hardening but does not depend on the solidification cooling rate.Internal damage accumulation, measured by monitoring the rate of stiffness loss with strain, is similar across the four microstructures explored and equals that measured in similar microcellular pure aluminium. In-situ flow curves of the metal within the open-pore microcellular material are back-calculated using the Variational Estimate of Ponte Castañeda and Suquet. Consistent results are obtained with heat-treated microcellular Al-4.5wt%Cu, and are also obtained with separate data for pure Al; however, for as-cast microcellular Al-4.5wt%Cu the back-calculated in-situ metal flow stress decreases, for both solidification rates, with decreasing relative density of the foam. We attribute this effect to an interplay between microstructural and mesostructural features of the microcellular material: variations in the latter with the former held constant can alter the scaling between flow stress and relative density within microcellular alloys.

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“…The effect is similar to syntactic foams where additions such as hollow ceramic spheres provide additional creep resistance as the load is transferred from the metallic matrix to the continuous ceramic reinforcement. [25][26][27] While the contribution of the two effects-reduction in density and growth of oxide-is not specifically detailed in this work, it is apparent that the net effect is well-described by power-law behavior.…”

Section: B Creep Propertiesmentioning

confidence: 92%

Effect of Oxidation on Creep Strength and Resistivity of Porous Fe-26Cr-1Mo

Scott

Dunand

2014

Metallurgical and Materials Transactions E

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To investigate its application as a material for solid oxide fuel cell interconnects, oxidation rates of replicated E-Brite (Fe-26Cr-1Mo, wt pct) foams with 43 and 51 pct open porosity were measured in static laboratory air for up to 200 hours. Results correlate well with previously reported values for dense material when normalized by surface area. Area-specific resistance measurements, taken in the range of 823 K to 1073 K (550°C to 800°C) after 24 hours of oxidation at 1123 K (850°C), yield activation energies in the range 69 to 82 kJ mol À1 for porous E-Brite that closely match dense E-Brite. Compressive creep properties, measured at 1073 K (800°C) for pristine and oxidized porous E-Brite, show that pre-oxidation (10 hours at 1073 K (800°C)) led to a~100-fold decrease in creep rate. This is due to strengthening of the alloy foam by the formation of a continuous network of oxide, which coats the internal pore surface and reduces porosity by as much as 10 pct after 200 hours of oxidation at 1073 K (800°C). Choking of the fenestrations between the pores, however, leads to an increase in closed porosity. Strengthening and pore filling effects should be taken into account in the design of the SOFC stack when using E-Brite as a porous interconnect material.

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Creep of replicated microcellular aluminium

Cited by 19 publications

References 40 publications

Introduction - Porous Metals: From Nano to Macro

Introduction - Porous Metals: From Nano to Macro

Influence of microstructural heterogeneity on the scaling between flow stress and relative density in microcellular Al–4.5 %Cu

Effect of Oxidation on Creep Strength and Resistivity of Porous Fe-26Cr-1Mo

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