Author/Authors :
Chino، نويسنده , , Yasumasa and Mabuchi، نويسنده , , Mamoru and Nakanishi، نويسنده , , Hideyuki and Iwasaki، نويسنده , , Hajime and Yamamoto، نويسنده , , Atsushi and Tsubakino، نويسنده , , Harushige، نويسنده ,
Abstract :
Gas expansion in a semisolid state at 903 K was quantitatively investigated from the viewpoint of the porosity, pore size and pore area for two kinds of 7075 Al alloy made of ∼25 and ∼355 μm powders. The pores were relatively uniformly formed and grown in a specimen made of the ∼25 μm powder. However, abnormally large pores of more than 500 μm in diameter were observed in the specimen made of the ∼355 μm powder, resulting from the nonuniform distribution of liquid phases. This points out the importance of a uniform distribution of liquid phases to reduce deviations in pore size.
Keywords :
Porous material , Gas expansion , Aluminum alloys , Semisolid processing , Foaming
