Phase separation in Ni70Nb30-xYx glasses

N. Mattern, U. Vainio, B. Schwarz, J. M. Park, D. H. Kim, J. Eckert

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Phase-separated metallic glasses in the ternary Ni-Nb-Y system were prepared by rapid quenching of the melt. For Ni-rich alloys, an early stage of spinodal decomposition or an almost homogeneous glassy state is obtained due to a lowering of the critical temperature of the liquid-liquid phase separation near to the glass transition temperature. In-situ small-angle X-ray scattering at elevated temperature gives evidence for ongoing phase separation of the glass prior to crystallization. The structural changes during isothermal heat treatment point to a spinodal mechanism of the decomposition. For glass with low Y-content (5 at%), no indication for phase separation is found in accordance with the composition dependence of the metastable miscibility gap of the supercooled liquid. Upon heating, the phase separated glass acts as a precursor and is the reason for the nanostructure of the Ni2Y-phase formed during the first stage of crystallization.

Original languageEnglish
Pages (from-to)1842-1845
Number of pages4
JournalIntermetallics
Volume18
Issue number10
DOIs
Publication statusPublished - 2010 Oct 1

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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    Mattern, N., Vainio, U., Schwarz, B., Park, J. M., Kim, D. H., & Eckert, J. (2010). Phase separation in Ni70Nb30-xYx glasses. Intermetallics, 18(10), 1842-1845. https://doi.org/10.1016/j.intermet.2010.02.035