Abstract
By use of the directional solidification of the metal-gas eutectic method (GASAR), a porous Cu-Mn alloy with oriented pores has been fabricated successfully. The variation of pore growth direction, pore distribution, and pore size were studied. In addition, by observing the microstructure on the transverse and longitudinal sections, it was found that the oriented pores could be formed with a cellular and columnar dendritic solidification mode if the cellular and primary dendrite arm spacing were much less than the pore diameter, which increases with the decrease of solidification velocity. In contrast, when an equiaxed dendritic structure appears, no oriented pore structure can be formed.
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