Glass-forming ability of bulk Pd40Ni10Cu30P20 alloy

Nobuyuki Nishiyama, Akihisa Inoue

Research output: Contribution to journalArticle

216 Citations (Scopus)

Abstract

The partial replacement of Ni by 30 at%Cu for the Pd40Ni40-xCuxP20 alloys was found to cause the drastic increase in the glass-forming ability as is evidenced from the decrease in the critical cooling rate for glass formation (Rc) to 1.5 K/s and the increase in the critical sample thickness for glass formation (tmax) to 40 mm. The Pd40Ni10Cu30P20 amorphous alloy exhibits the distinct glass transition, followed by the appearance of a wide supercooled liquid region (ΔTx(=Tx-Tg) reaching 95 K and then a single-stage crystallization. The differential thermal analysis indicates that the Pd-Ni-Cu-P alloy has a single stage melting reaction at 804 K. The resulting Tg/Tm is measured to be as high as 0.72. Considering that the Rc, tmax, ΔTx and Tg/Tm are 128 K/s, about 7 mm, 63 K and 0.66, respectively, for a Pd40Ni40P20 amorphous alloy with the largest glass-forming ability in previously reported Pd-based alloys, the present new Pd-Ni-Cu-P amorphous alloy is concluded to have a much larger glass-forming ability and a higher thermal stability of the supercooled liquid. The crystallization occurs through a single stage due to the precipitation of more than four kinds of crystalline phases and hence the necessity of long-range rearrangement of the constituent elements for the progress of the precipitation seems to cause the large glass-forming ability and the high thermal stability of the supercooled liquid through the retardation of crystallization. The finding of the new Pd-based amorphous alloy with the much larger glass-forming ability is important for the future development of basic science and engineering application of amorphous alloys.

Original languageEnglish
Pages (from-to)1531-1539
Number of pages9
JournalMaterials Transactions, JIM
Volume37
Issue number10
DOIs
Publication statusPublished - 1996 Jan 1

Keywords

  • Bulk amorphous alloys
  • Continuous-cooling-transformation curve
  • Copper mold casting
  • High reduced glass-transition temperature
  • Large glass-forming ability
  • Low critical cooling rate
  • Palladium-nickel-copper-phosphorus system
  • Wide supercooled liquid region

ASJC Scopus subject areas

  • Engineering(all)

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