Preparation of bulk glassy Pd40Ni10Cu30P20 alloy of 40 mm in diameter by water quenching

Akihisa Inoue, Nobuyuki Nishiyama, Takayuki Matsuda

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Abstract

Cylindrical glassy alloys with diameters up to 40 mm were prepared for a Pd40Ni10Cu30P20 alloy with a high reduced glass transition temperature (Tg/Tm) of 0.71 by water quenching the molten alloy in the quartz tube. The bulk glassy alloy with a diameter of 40 mm exhibits good metallic luster on the outer surface. Neither cavities nor voids are seen over the whole inner region and no contrast revealing a crystalline phase is seen over the transverse cross section. The glass transition temperature (Tg), crystallization temperature (Tx), the temperature interval of the supercooled liquid region (ΔTx=Tx-Tg) and the melting temperature (Tm) are measured to be 575, 95 and 804 K, respectively, for the Pd40Ni10Cu30P20 alloy with a diameter of 40 mm. The deviation of Cu content from 30 at%Cu in the Pd40Ni40-xCuxP20 system causes a steep increase in Tm and a decrease in Tg/Tm, leading to the decrease in the glass-forming ability. The successes of finding the new Pd-Cu base alloy composition with the large ΔTx and Tg/Tm values and preparing the bulk glassy alloy with a diameter of 40 mm are encouraging for the future development of glassy alloys.

Original languageEnglish
Pages (from-to)181-184
Number of pages4
JournalMaterials Transactions, JIM
Volume37
Issue number2
DOIs
Publication statusPublished - 1996 Feb

Keywords

  • 40 mm diameter alloy
  • Bulk glassy alloy
  • High reduced glass transition temperature
  • Large glass-forming ability palladium-nickel-copper-phosphorus system
  • Water quenching technique

ASJC Scopus subject areas

  • Engineering(all)

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