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

48 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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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 - Kim, Do Hyang

AU - Kim, W. T.

AU - Eckert, J.

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AB - 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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