Fabrication of Lotus-Type Porous NiAl and Ni3Al Intermetallic Compounds

Takuya Ide; Masakazu Tane; Hideo Nakajima

doi:10.4028/www.scientific.net/SSP.124-126.1721

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Fabrication of Lotus-Type Porous NiAl and Ni₃Al Intermetallic Compounds
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HomeSolid State PhenomenaSolid State Phenomena Vols. 124-126Fabrication of Lotus-Type Porous NiAl and Ni3Al...

Fabrication of Lotus-Type Porous NiAl and Ni₃Al Intermetallic Compounds

Abstract:

Lotus-type porous NiAl and Ni3Al intermetallic compounds, possessing cylindrical pores aligned in the direction parallel to the solidification direction, were fabricated by using a unidirectional solidification technique in a pressurized hydrogen atmosphere of 2.5MPa. The porosity of lotus NiAl is 24.2 %, and the porosity of lotus Ni3Al is 3.2%; the porosity of the porous NiAl is larger than that of Ni3Al. This is because the solubility gap of hydrogen between liquid and solid phases of NiAl is larger than that of Ni3Al.