Undercooling behavior and critical cooling rate of Pd-Pt-Cu-P alloy

Nobuyuki Nishiyama; Kana Takenaka; Takeshi Wada; Hisamichi Kimura; Akihisa Inoue

doi:10.2320/matertrans.46.2807

Undercooling behavior and critical cooling rate of Pd-Pt-Cu-P alloy

Nobuyuki Nishiyama, Kana Takenaka, Takeshi Wada, Hisamichi Kimura, Akihisa Inoue

Research output: Contribution to journal › Article › peer-review

11 Citations (Scopus)

Abstract

In order to realize biomedical applications of bulk glassy alloys, we have developed new Pd-based glassy alloys with Ni-free composition in Pd-Pt-Cu-P system and it is revealed that the highest glass-forming ability is obtained at a composition of Pd₃₅Pt₁₅Cu₃₀P₂₀. In addition, the alloy can be formed into bulk glassy rods with diameters of up to at least 30 mm by fluxed water quenching. In order to clarify the critical cooling rate for glass-formation, undercooling behavior and crystal growth rate are also discussed. Crystallization of the alloy under continuous cooling is mainly dominated by surface nucleation. Apparent crystal growth rate of the alloy at 0.73 T_m is evaluated to be 5.2 × 10^-6 m.s^-1 and this value is four orders of magnitude higher than that of previous Pd₄₀Cu₃₀Ni₁₀P₂₀ at the same degree of undercooling.

Original language	English
Pages (from-to)	2807-2810
Number of pages	4
Journal	Materials Transactions
Volume	46
Issue number	12
DOIs	https://doi.org/10.2320/matertrans.46.2807
Publication status	Published - 2005 Dec

Keywords

Biomedical applications
Bulk glassy alloys
Critical cooling rate
Nickel-allergy
Undercooling behavior

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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title = "Undercooling behavior and critical cooling rate of Pd-Pt-Cu-P alloy",

abstract = "In order to realize biomedical applications of bulk glassy alloys, we have developed new Pd-based glassy alloys with Ni-free composition in Pd-Pt-Cu-P system and it is revealed that the highest glass-forming ability is obtained at a composition of Pd35Pt15Cu30P20. In addition, the alloy can be formed into bulk glassy rods with diameters of up to at least 30 mm by fluxed water quenching. In order to clarify the critical cooling rate for glass-formation, undercooling behavior and crystal growth rate are also discussed. Crystallization of the alloy under continuous cooling is mainly dominated by surface nucleation. Apparent crystal growth rate of the alloy at 0.73 Tm is evaluated to be 5.2 × 10-6 m.s-1 and this value is four orders of magnitude higher than that of previous Pd40Cu30Ni10P20 at the same degree of undercooling.",

keywords = "Biomedical applications, Bulk glassy alloys, Critical cooling rate, Nickel-allergy, Undercooling behavior",

author = "Nobuyuki Nishiyama and Kana Takenaka and Takeshi Wada and Hisamichi Kimura and Akihisa Inoue",

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AU - Nishiyama, Nobuyuki

AU - Takenaka, Kana

AU - Wada, Takeshi

AU - Kimura, Hisamichi

AU - Inoue, Akihisa

PY - 2005/12

Y1 - 2005/12

N2 - In order to realize biomedical applications of bulk glassy alloys, we have developed new Pd-based glassy alloys with Ni-free composition in Pd-Pt-Cu-P system and it is revealed that the highest glass-forming ability is obtained at a composition of Pd35Pt15Cu30P20. In addition, the alloy can be formed into bulk glassy rods with diameters of up to at least 30 mm by fluxed water quenching. In order to clarify the critical cooling rate for glass-formation, undercooling behavior and crystal growth rate are also discussed. Crystallization of the alloy under continuous cooling is mainly dominated by surface nucleation. Apparent crystal growth rate of the alloy at 0.73 Tm is evaluated to be 5.2 × 10-6 m.s-1 and this value is four orders of magnitude higher than that of previous Pd40Cu30Ni10P20 at the same degree of undercooling.

AB - In order to realize biomedical applications of bulk glassy alloys, we have developed new Pd-based glassy alloys with Ni-free composition in Pd-Pt-Cu-P system and it is revealed that the highest glass-forming ability is obtained at a composition of Pd35Pt15Cu30P20. In addition, the alloy can be formed into bulk glassy rods with diameters of up to at least 30 mm by fluxed water quenching. In order to clarify the critical cooling rate for glass-formation, undercooling behavior and crystal growth rate are also discussed. Crystallization of the alloy under continuous cooling is mainly dominated by surface nucleation. Apparent crystal growth rate of the alloy at 0.73 Tm is evaluated to be 5.2 × 10-6 m.s-1 and this value is four orders of magnitude higher than that of previous Pd40Cu30Ni10P20 at the same degree of undercooling.

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KW - Bulk glassy alloys

KW - Critical cooling rate

KW - Nickel-allergy

KW - Undercooling behavior

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