Production of Al-based Amorphous Alloys by a Metallic Mold Casting Method and their Thermal Stability

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A mostly single Al-based amorphous phase in a sheet form with a thickness of 0.2 mm was found to be formed in the composition range of 6 to 10 at% Ni and 4 to 6 at% Ce in Al-Ni-Ce system by a metallic mold casting process. With increasing sheet thickness, the as-cast structure changes to coexistent amorphous and crystalline phases in the sheets with thicknesses of 0.3 and 0.4 mm and crystalline phases in the sheet with a thickness of 0.5 mm. The composition range in which a mostly single amorphous phase is formed by casting is located at the Al-rich side against the Al_<84>Ni_<10>Ce_6 alloy with the widest supercooled liquid region. No amorphous single phase is formed for the alloys which are located at the Al-poor side, though the supercooled liquid region is observed. The deviation of the glass-formation range by casting from the composition range in which the supercooled liquid region is observed is presumably because of a high growth rate or an easy heterogeneous nucleation of eutectic-type crystalline phases which appear at the Al-poor concentration side. In addition, the application of the casting process to Al_<84>Ni_8Y_8 and Al_<84>Ni_<10>La_6 alloys caused the formation of coexistent amorphous and crystalline phases in the sheet with a thickness of 0.2 mm, presumably because of their lower glass-forming ability. The finding that the amorphous alloy sheet in the Al-based system is formed by the conventional casting process is quite important in the subsequent development of the amorphous alloys by utilizing the high mechanical strengths and good corrosion resistance.aluminum-based alloyamorphous phasebulk alloymold casting methodlarge glass-forming ability
東北大学の論文
1994-03-25

Production of Al-based Amorphous Alloys by a Metallic Mold Casting Method and their Thermal Stability

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