Abstract
Lotus-type porous metals are fabricated by directional solidification of molten metals dissolving hydrogen. Unidirectional pores cause various anisotropic features of mechanical, thermal and electrical properties. Tensile, compressive and fatigue strength parallel to the pore direction are higher than those perpendicular to the pore direction. Besides, thermal and electrical conductivities parallel to the pore direction are higher than those perpendicular to the pore direction. Such anisotropy is attributed to the difference in the pinning cross-sectional area due to the dislocations and the scattering cross-sectional area due to electrons. The pore cross-sectional area perpendicular to the pore direction is much larger than that parallel to the pore direction. It is surmised that such difference in pore cross-section results in the anisotropy in mechanical, thermal and electrical properties.
Highlights
Porous and foamed metals exhibit various characteristics such as low density and large surface area, which differ from bulk metals
Thermal and electrical conductivities parallel to the pore direction are higher than those perpendicular to the pore direction
Lotus-type and gasar-processed porous metals have attracted much attention because those possess long cylindrical pores aligned in one direction, which are anisotropic porous morphology. (Hereafter we call lotus metals.) While various mechanical and physical properties of isotropic porous metals usually exhi
Summary
Porous and foamed metals exhibit various characteristics such as low density and large surface area, which differ from bulk metals. These metals are expected to be used as lightweight materials, catalyst carrier, electrodes, vibration and acoustic energy damping materials, impact energy absorption materials, etc. Most of the porous metals possess isotropic porous morphology. Lotus-type and gasar-processed porous metals have attracted much attention because those possess long cylindrical pores aligned in one direction, which are anisotropic porous morphology. (Hereafter we call lotus metals.) While various mechanical and physical properties of isotropic porous metals usually exhi-. H. Nakajima bit isotropic characteristic, these properties of lotus metals show anisotropic features, depending upon the pore direction which are peculiar to lotus metals. The review describes anisotropic features of mechanical, thermal and electrical properties in order to elucidate the anisotropic mechanism
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