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, Do Hyang Kim, W. T. Kim, J. Eckert

Research output: Contribution to journalArticle

46 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

Fingerprint

Metallic glass
Microstructure
Liquids
Phase separation
Copper
Casting
Solubility
Thermodynamics
Cooling
Atoms
Kinetics
Processing
Chemical analysis

All Science Journal Classification (ASJC) codes

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

Cite this

He, J. ; Mattern, N. ; Tan, J. ; Zhao, J. Z. ; Kaban, I. ; Wang, Z. ; Ratke, L. ; Kim, Do Hyang ; Kim, W. T. ; Eckert, J. / A bridge from monotectic alloys to liquid-phase-separated bulk metallic glasses : Design, microstructure and phase evolution. In: Acta Materialia. 2013 ; Vol. 61, No. 6. pp. 2102-2112.
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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.",
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He, J, Mattern, N, Tan, J, Zhao, JZ, Kaban, I, Wang, Z, Ratke, L, Kim, DH, Kim, WT & Eckert, J 2013, 'A bridge from monotectic alloys to liquid-phase-separated bulk metallic glasses: Design, microstructure and phase evolution', Acta Materialia, vol. 61, no. 6, pp. 2102-2112. https://doi.org/10.1016/j.actamat.2012.12.031

A bridge from monotectic alloys to liquid-phase-separated bulk metallic glasses : Design, microstructure and phase evolution. / He, J.; Mattern, N.; Tan, J.; Zhao, J. Z.; Kaban, I.; Wang, Z.; Ratke, L.; Kim, Do Hyang; Kim, W. T.; Eckert, J.

In: Acta Materialia, Vol. 61, No. 6, 01.04.2013, p. 2102-2112.

Research output: Contribution to journalArticle

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T1 - A bridge from monotectic alloys to liquid-phase-separated bulk metallic glasses

T2 - Design, microstructure and phase evolution

AU - He, J.

AU - Mattern, N.

AU - Tan, J.

AU - Zhao, J. Z.

AU - Kaban, I.

AU - Wang, Z.

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AU - Eckert, J.

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