Abstract The foaming of aluminum melt LKR‐Austria is investigated. was performed in a furnace chamber at adiabatic conditions to keep the foam liquid state. foams were taken out from after 1, 10 and 100 min isothermal holding time cooled air or quenched water. final cellular structure depends on following parameters: particle (composition, shape size, volume fraction), gas (composition purity), particle‐surface interactions, matrix alloy composition temperature foaming. Metallographical...

Abstract Metal foams were produced by blowing gas into aluminium alloy melts. The effect of oxygen content the on composition and structure inner surface foam cells is studied varying from argon, nitrogen air to pure oxygen. Scanning Electron Microscopy, Auger Spectroscopy Transmission Microscopy are used analyse surfaces. Initially particle‐free melts pre‐treated bubbling through them after which a certain degree stability achieved. oxidation products characterised microscopy such foams.

Rupture of an individual film in evolving liquid metal foam is investigated by means high-speed x-ray radioscopy using white synchrotron radiation. At a frame rate 5000frames∕s, the rupture event spread over three to four images. The images show that remnants rupturing are pulled into surrounding plateau borders 600±100μs which conforms well with movement governed inertia and not viscosity. Within one order magnitude, viscosity involved must be similar pure aluminium.

Abstract Metal foams are one of the most interesting types materials although there is limited information concerning their thermal and electrical conductivity. Closed cell different density Alporas investigated, which has homogeneous size distribution recently. Comparative method been chosen to determine conductivity samples in function temperature at 30, 100, 200, 300, 400, 500 °C. For measuring aluminium a special low frequency eddy current apparatus was used. The ratio calculated shown...

ALUHAB is a new type of aluminium foams with controlled, homogeneous cell sizes which has wide range alloy compositions, and attractive mechanical properties. The technology results in extremely stable metal can be cast into complex forms re-melted without loss foam integrity. are manufactured from containing ultrafine particles (typically below 3 μm). Special high temperature admixing used order to homogeneously disperse the thus create stable, foamable melt. Our unique loud-nozzle permits...

An increasing interest in lightweight metallic foams for automotive, aerospace, and other applications has been observed recent years. This is mainly due to the weight reduction that can be achieved using their mechanical energy absorption acoustic damping capabilities. accurate knowledge of behavior these materials, especially under dynamic loadings, thus necessary. Unfortunately, metal general "soft" materials exhibit a series peculiarities make difficult adoption standard testing...

For quality assurance of aluminium foams the cell size determination is an important factor. Our micro-computed tomography (micro-CT) equipment capable to image three dimensional structure these such as ALUHAB with a resolution in range 5-50microns. The CT parameters for optimal were determined by varying sample, applied projection number and also X-ray source operating parameters. evaluation software was programmed C language order determine distribution. algorithm increase thin wall...

In the present paper authors studied isolated metallic films made from same material used for making foams, and then characterised their properties. Metal were a liquid aluminium alloy reinforced with ceramic particles of known concentration. Melts without such also investigated. It is shown that stable could not be Al-Si having no particles, just extremely thin fragile commercially-pure Al. contrast, alloys containing as SiC TiB(2) allowed pulling thin, films, which did rupture. Significant...

This paper deals with the experimental and numerical study of closed-cell aluminum-based foam under compressive loading. Experimental samples were produced by gas blowing method. Foam had an average cell size around 1 mm, sizes in range 0.5-5 density 0.6 g/cm3. subjected to a uniaxial compression test, at displacement rate 0.001 mm/s. Load stress monitored as functions extension strain, respectively. For modeling, CT scan images used create volume model. Solid 3D quadratic tetrahedron mesh...

Abstract Nominated for Eurosteel 2021 Best Paper Award The introduction to the market of metal foams represents a significant opportunity increase use in construction market. In fact, development new products made and steel could improve performance conventional buildings terms stiffness resistance. first structural applications these materials have already shown potential composites foam steel, demonstrated feasibility producing mono‐dimensional bi‐dimensional elements with high...

Metal foams are quite a challenge to materials scientists due their difficult manufacturing. In all processes the foam develops in liquid or semiliquid state. Liquid-metal complex fluids which contain metals, solid particles and gas bubbles at same time. An X-ray transparent furnace was developed monitor metal evolution. Aluminium - similar commercial Metcomb were produced by feeding argon air into an aluminium composite melt. The evolution observed in-situ radioscopy under normal gravity....

The aim of this work is to elucidate the role and contribution oxide particles aluminum foam fabrication. melts were internally oxidized by a thickening process in which pure melt was stirred with or without addition 1.5 wt.% calcium for maximum 25 min. After this, each thickened samples melted again mixed 100 s introducing TiH2 as blowing agent. In order investigate evolution, hold furnace 50 500 s. stirring torque (viscosity) containing increases time achieves stationary value after 17...

Aluminum foams are manufactured using various viscosity increasing methods at present. Although it is well known that calcium addition one of the most successful thickening processes for fabricating fine foams, intimate mechanism still lacking. The aim this paper investigation detailed and influence increase conditions on aluminum foams. Thickened samples were prepared pure admixed contents or powder as agents. Microstructure analysis thickened was carried out. As quantitative evaluations,...

Aluminum foams have low density, high energy absorption, and specific stiffness. Further strengthening of aluminum foam-based structures can be achieved by using a massive metallically bonded outer shell. Thanks to Aluinvent foaming technology the developed casting processes, we produce such parts with different shape, size, controlled mechanical properties. Thus, complex cast around foam core are excellent candidates three-dimensional (3D) shape car parts. Using micro-computed tomography...