Influences of hydrostatic pressure during casting and Pd content on as-cast phase in Zr-Al-Ni-Cu-Pd bulk alloys

Journal Article · Mon Sep 20 04:00:00 EDT 2004 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.1790028· OSTI ID:20634268

Kato, Hidemi; Inoue, Akihisa; Saida, Junji ^[1]

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1. Institute for Materials Research, Tohoku University Katahira 2-1-1, Sendai 980-8577 (Japan)

The influences of sample diameter (D), Pd content (x), and hydrostatic pressure (P) in a chamber during casting on the structure of as cast Zr{sub 65}Al{sub 7.5}Ni{sub 10}Cu{sub 17.5-x}Pd{sub x}(x=10,17.5 at.%) bulk alloys were investigated. Zr{sub 65}Al{sub 7.5}Ni{sub 10}Cu{sub 7.5}Pd{sub 10} and Zr{sub 65}Al{sub 7.5}Ni{sub 10}Pd{sub 17.5} alloys (D=3 mm) cast in a vacuum chamber (P{approx}4.0x10{sup -3} Pa) were mainly of the tetragonal-Zr{sub 2}Ni equilibrium phase and nanosize icosahedral primary phase, respectively, while the same alloys cast in inert argon gas at atmospheric pressure (P{approx}0.1 MPa) were of the single glassy phase. Due to the higher cooling rate obtained by decreasing the sample diameter (D=2 mm) even in the vacuum chamber, the Zr{sub 65}Al{sub 7.5}Ni{sub 10}Pd{sub 17.5} alloy was still of the icosahedral phase, while the Zr{sub 65}Al{sub 7.5}Ni{sub 10}Cu{sub 7.5}Pd{sub 10} alloy froze into a single glassy phase. These results indicate that the temperature- and time- transformation curves for the icosahedral and subsequent equilibrium phase formations in the alloy system shifts to a shorter time side with decreasing P, and the pressure sensitivity of the icosahedral phase formation increases with x.

• OSTI ID: 20634268
• Journal Information: Applied Physics Letters, Journal Name: Applied Physics Letters Journal Issue: 12 Vol. 85; ISSN APPLAB; ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALLOY SYSTEMS
ALUMINIUM ALLOYS
ARGON
ATMOSPHERIC PRESSURE
CASTINGS
COOLING
COPPER ALLOYS
METALLIC GLASSES
NANOSTRUCTURES
NICKEL ALLOYS
PALLADIUM ALLOYS
PHASE TRANSFORMATIONS
TEMPERATURE DEPENDENCE
TIME DEPENDENCE
VACUUM CASTING
ZIRCONIUM ALLOYS