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Alloy Foams (alloy + foam)

Distribution by Scientific Domains
Polymers and Materials Science75%

Selected Abstracts

Age-hardening Response of Replicated Microcellular Al-4.5%Cu,

ADVANCED ENGINEERING MATERIALS, Issue 9 2008
Y. Conde
We study the response to age hardening of Al-4.5%Cu replicated foams having 75 and 400 ,m diameter cells and of relative density between 0.1 and 0.32, to show that the age-hardening response can depend on the cell size and morphology, and that open-celled replicated high-strength aluminium alloy foams can be made as strong as commercial closed-celled aluminium foams despite their inferior mesostructural features. [source]

The stress,life fatigue behaviour of aluminium alloy foams

FATIGUE & FRACTURE OF ENGINEERING MATERIALS AND STRUCTURES, Issue 3 2000
McCullough
The tension,tension and compression,compression nominal stress versus fatigue life responses of Alulight closed cell aluminium alloy foams have been measured for the compositions Al,1Mg,0.6Si and Al,1Mg,10Si (wt %), and for relative densities in the range 0.1,0.4. The fatigue strength of each foam increases with the relative density and with the mean applied stress, and is greater for the transverse orientation than for the longitudinal orientation. Under both tension,tension and compression,compression loading the dominant cyclic deformation mode appears to be material ratchetting; consequently, the fatigue life is highly sensitive to the magnitude of the applied stress. A micromechanical model is given to predict the dependence of life upon stress level and relative density. Panels containing a central hole were found to be notch insensitive for both tension,tension and compression,compression fatigue loading: the net-section strength equals the unnotched strength. [source]

Titanium foam-bioactive nanofiber hybrids for bone regeneration

JOURNAL OF TISSUE ENGINEERING AND REGENERATIVE MEDICINE, Issue 8 2008
Timothy D. Sargeant
Abstract We have reported previously a method to introduce bioactive nanofiber networks through self-assembly into the pores of titanium alloy foams for bone repair. In this study we evaluate the in vitro colonization by mouse pre-osteoblastic cells of these metal,peptide amphiphile hybrids containing phosphoserine residues and the RGDS epitope. The aim was to determine the effect of varying the RGDS epitope concentration within a given range, and confirm the ability for cells to infiltrate and survive within the nanofiber-filled interconnected porosity of the hybrid material. We performed proliferation (DNA content) and differentiation assays (alkaline phosphatase and osteopontin expression) as well as SEM and confocal microscopy to evaluate cell colonization of the hybrids. At the RGDS epitope concentrations used in the nanofiber networks, all samples demonstrated significant cell migration into the hybrids, proliferation, and differentiation into osteoblastic lineage. Copyright © 2008 John Wiley & Sons, Ltd. [source]