Origin of Different Dependence of Apparent Glass-Forming Ability on Casting-Atmosphere-Pressure in Zr-Al-Ni-Cu-Pd Alloy System

Albertus D. Setyawan; Hidemi Kato; Junji Saida; Akihisa Inoue

doi:10.4028/www.scientific.net/MSF.561-565.1311

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Plastic Deformation of Electrodeposited Nanocrystalline Ni-W Alloys at High Temperatures
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Low Cycle Fatigue of Electrodeposited Pure Nanocrystalline Metals
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Comparison of Mechanical Properties between As-Quenched and Annealed Metallic Glass Pd₄₄Cu₃₁Ni₈P₁₇
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Small-Scale Resistance Spot Welding of Zr Based Glassy Alloys
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Origin of Different Dependence of Apparent Glass-Forming Ability on Casting-Atmosphere-Pressure in Zr-Al-Ni-Cu-Pd Alloy System
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Controlled Elasticity in Nano-Structured Metallic Glass by Ion Implantation Method
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Hydrogen Production by Methanol Steam Reforming Using Amorphous Metal Membranes
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Shear Banding Analyses of Amorphous Alloys with Crystalline Particles
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Quasicrystallization of (Zr₆₅Al_7.5Cu_27.5)₉₅Ti₅ Glassy Alloy
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Origin of Different Dependence of Apparent Glass-Forming Ability on Casting-Atmosphere-Pressure in Zr-Al-Ni-Cu-Pd Alloy System

Abstract:

A Zr65Al7.5Ni10Cu17.5-xPdx (x=0-17.5 at. %) alloy system is found to exhibit a different dependence of glass-forming ability (GFA) on atmosphere-pressure during mold casting process. High-Pd alloys (x=7.5-17.5) show a remarkable increase of critical size for glass formation (dc) as casting-atmosphere (Ar) pressure varies from vacuum to ambient. No significant change of dc, however, is observed in low-Pd alloys (x=0-5) despite the variation in atmosphere pressure. The origin of the phenomenon is unveiled by correlating the cooling characteristic during mold casting and on-cooling phase transformation characteristic of the alloy system.