Glass-forming ability and thermoplastic formability of a Pd 40Ni40Si4P16 glassy alloy

N. Chen, H. A. Yang, A. Caron, P. C. Chen, Y. C. Lin, D. V. Louzguine-Luzgin, K. F. Yao, M. Esashi, A. Inoue

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29 Citations (Scopus)

Abstract

The glass-forming ability of a Pd40Ni40Si 4P16 alloy has been investigated. This alloy exhibits a wide supercooled liquid region of 107 K, a high reduced glass transition temperature of 0.596 and a small fragility parameter of 28, indicating that this alloy is a good glass former. Using flux treatment, the Pd40Ni 40Si4P16 alloys can be easily produced as centimeter-scale metallic glasses. The glass transition and crystallization kinetics of this alloy were investigated by means of both differential scanning calorimetry (DSC) and differential isothermal calorimetry (DIC). Thermoplastic forming of the Pd40Ni40Si4P16 glassy alloy is easily performed due to the high thermal stability and low viscosity of the supercooled liquid. By pressing a "flat" silicon wafer onto a sample within the thermoplastic forming region, the surface of the Pd 40Ni40Si4P16 metallic glasses could be significantly smoothened. The final surface showed a reduced root mean square roughness R q as low as ~2 nm. This indicates a simple approach to prepare "flat" surfaces for metallic glasses.

Original languageEnglish
Pages (from-to)2091-2096
Number of pages6
JournalJournal of Materials Science
Volume46
Issue number7
DOIs
Publication statusPublished - 2011 Apr

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Mechanical Engineering

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