Lotus-type porous magnesium, in which countless small pores elongated in the solidification direction are dispersed, was fabricated by unidirectional solidification under hydrogen atmosphere. Ingots with various sets of porosities and averaged pore diameter can be obtained by controlling the pressure of hydrogen atmosphere. In the present experiments, porous magnesium ingots with porosities and averaged pore diameters in the range of 0~50% and 60~800
μm were fabricated. These materials are very light weight ; porous magnesium with 50% porosity has a density of 0.87g/cm
3 and floats in water. The anisotropy in tensile strength of porous magnesium was observed and it was found that the tensile strength in the direction parallel to the pores is higher than that perpendicular.
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