TY - JOUR
T1 - Pore morphology of porous Al-Ti alloy fabricated by continuous casting in hydrogen atmosphere
AU - Kim, T. B.
AU - Tane, M.
AU - Suzuki, S.
AU - Nakajima, H.
PY - 2010/10
Y1 - 2010/10
N2 - Porous Al-5 mass%Ti alloy was fabricated by unidirectional solidification in hydrogen atmosphere, using a continuous casting technique. The porous Al-Ti alloy was prepared at different transfer (solidification) velocities, and the effect of transfer velocity on the pore morphology was investigated. It was found that the pore shape changes with increasing transfer velocity, while the porosity does not change with increasing transfer velocity. In the case of a low transfer velocity (0.5 mm·min-1), elongated pores surrounded by the columnar microstructure are formed, which indicates that the pores grow along the solidification direction together with the solid phase. In the case of a middle transfer velocity (5.0 mm·min-1), elongated pores surrounded by the columnar microstructure and needle or plate-like Al 3Ti alloys are formed. In the case of a high transfer velocity (10.0 mm·min-1), spherical pores surrounded by the equiaxed microstructure are formed, because the primary crystals formed in the solidification front prevent the growth of elongated pores. It is suggested that the pore morphology is closely related with the solidification rate.
AB - Porous Al-5 mass%Ti alloy was fabricated by unidirectional solidification in hydrogen atmosphere, using a continuous casting technique. The porous Al-Ti alloy was prepared at different transfer (solidification) velocities, and the effect of transfer velocity on the pore morphology was investigated. It was found that the pore shape changes with increasing transfer velocity, while the porosity does not change with increasing transfer velocity. In the case of a low transfer velocity (0.5 mm·min-1), elongated pores surrounded by the columnar microstructure are formed, which indicates that the pores grow along the solidification direction together with the solid phase. In the case of a middle transfer velocity (5.0 mm·min-1), elongated pores surrounded by the columnar microstructure and needle or plate-like Al 3Ti alloys are formed. In the case of a high transfer velocity (10.0 mm·min-1), spherical pores surrounded by the equiaxed microstructure are formed, because the primary crystals formed in the solidification front prevent the growth of elongated pores. It is suggested that the pore morphology is closely related with the solidification rate.
KW - Aluminum-titanium alloys
KW - Porous aluminum alloys
KW - Porous metals
KW - Unidirectional solidification
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U2 - 10.2320/matertrans.M2010223
DO - 10.2320/matertrans.M2010223
M3 - Article
AN - SCOPUS:78649384832
VL - 51
SP - 1871
EP - 1877
JO - Materials Transactions
JF - Materials Transactions
SN - 1345-9678
IS - 10
ER -