A bridge from monotectic alloys to liquid-phase-separated bulk metallic glasses: Design, microstructure and phase evolution

J. He, N. Mattern, J. Tan, J. Z. Zhao, I. Kaban, Z. Wang, L. Ratke, D. H. Kim, W. T. Kim, J. Eckert

Research output: Contribution to journalArticle

51 Citations (Scopus)

Abstract

The Zr-Ce-La system is characterized by a miscibility gap and a monotectic reaction. It separates into Zr-rich and CeLa-rich liquids upon cooling through the gap. Based on this system, a new Zr-Ce-La-Al-Co monotectic system was created to synthesize liquid-phase-separated bulk metallic glasses (LPS-BMGs) by copper mold casting. A systematical investigation was performed for the effects of the relative atomic ratios of Zr:CeLa, Co:Al and Ce:La on the microstructure features and chemical compositions of the two coexistent phases. Dual atom pairs with positive heat of mixing (Zr-Ce: +12 kJ mol-1 and Zr-La: +13 kJ mol-1) are originally adopted to develop such LPS-BMGs. A series of in situ formed LPS-BMGs with a critical thickness of 2.5 mm has been successfully synthesized. By combining the kinetics of liquid-liquid phase separation with the formation of metallic glasses, the mechanisms of phase formation and the microstructure evolution in the rapidly cooled alloys are discussed in detail. Furthermore, a thermodynamic model is proposed for LPS-BMG design, attempting to build a bridge from monotectic/immiscible (M/I) alloys to LPS-BMGs. This work not only provides opportunities for new insights into the synthesis of LPS-BMGs and their properties but also opens new perspectives for processing and research of M/I alloys.

Original languageEnglish
Pages (from-to)2102-2112
Number of pages11
JournalActa Materialia
Volume61
Issue number6
DOIs
Publication statusPublished - 2013 Apr 1

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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    He, J., Mattern, N., Tan, J., Zhao, J. Z., Kaban, I., Wang, Z., Ratke, L., Kim, D. H., Kim, W. T., & Eckert, J. (2013). A bridge from monotectic alloys to liquid-phase-separated bulk metallic glasses: Design, microstructure and phase evolution. Acta Materialia, 61(6), 2102-2112. https://doi.org/10.1016/j.actamat.2012.12.031