Phase separation in Ni70Nb30-xYx glasses

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

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


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
Issue number10
Publication statusPublished - 2010 Oct

Bibliographical note

Funding Information:
The authors thank S. Donath, M. Frey and B. Opitz for sample preparation. Financial support of the Deutsche Forschungsgemeinschaft DFG (project Ma1531/10 ) and through the Global Research Laboratory Program of the Korea Ministry of Education, Science and Technology is gratefully acknowledged.

All Science Journal Classification (ASJC) codes

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


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