Consolidation of Cu 58Zr 42 amorphous/nanocrystalline powders by PM

K. Tomolya, D. Janovszky, T. Janvari, A. Sycheva, F. Tranta, J. Solyom, T. Ferenczi, A. Roosz

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Abstract

Cu 58Zr 42 amorphous/nanocrystalline composite particles were prepared by ball-milling. The powders were used as base-material of compact samples produced by powder metallurgy (PM). After 3.5 h mechanical milling, the powders were predominantly amorphous, which were analysed by XRD to define the amorphous fraction, by TEM and SEM to reveal the microstructure, by DSC to observe the processes during heating in the powder. The structure of the powder shows that in the amorphous part coexist crystalline areas sized 10-20 nm and short range order sized below 10 nm. By PM, cylindrical green compacts were produced using uniaxial cold pressing at 1 GPa and without any lubricant. The aim was to obtain compact samples without any changes in the amorphous/nanocrystalline fraction. The sintering temperature is restricted by the onset of crystallisation temperature (T x) which causes the change of the amorphous/crystalline structure. Based on the DSC plots of the powders, temperature of 563 K and 723 K were chosen for sintering.

Original languageEnglish
Pages (from-to)S154-S158
JournalJournal of Alloys and Compounds
Volume536
Issue numberSUPPL.1
DOIs
Publication statusPublished - Sep 25 2012

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Keywords

  • Amorphization
  • Amorphous materials
  • Powder metallurgy
  • Sintering

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Cite this

Tomolya, K., Janovszky, D., Janvari, T., Sycheva, A., Tranta, F., Solyom, J., Ferenczi, T., & Roosz, A. (2012). Consolidation of Cu 58Zr 42 amorphous/nanocrystalline powders by PM. Journal of Alloys and Compounds, 536(SUPPL.1), S154-S158. https://doi.org/10.1016/j.jallcom.2011.12.107