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

He, Jie and Mattern, Norbert and Tan, J and Zhao, Jizhou Z. and Kaban, Ivan and Wang, Z and Ratke, Lorenz and Kim, D.H. and Kim, W.T. and Eckert, Jürgen (2013) A bridge from monotectic alloys to liquid-phase-separated bulk metallic glasses: Design, microstructure and phase evolution. Acta Materialia, 61, pp. 2102-2112. Elsevier. DOI: 10.1016/j.actamat2012.12.031 ISSN 1359-6454

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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-phaseseparated 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 mol1 and Zr–La: +13 kJ mol1) 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 LPSBMG 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.

Item URL in elib:https://elib.dlr.de/81805/
Document Type:Article
Title:A bridge from monotectic alloys to liquid-phase-separated bulk metallic glasses: Design, microstructure and phase evolution
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
He, JieIFW DresdenUNSPECIFIED
Mattern, NorbertIFW DresdenUNSPECIFIED
Tan, JIFW DresdenUNSPECIFIED
Zhao, Jizhou Z.Institute of Metals Res., Shenyang, ChinaUNSPECIFIED
Kaban, IvanIFW DresdenUNSPECIFIED
Wang, ZIFW DresdenUNSPECIFIED
Ratke, LorenzUNSPECIFIEDUNSPECIFIED
Kim, D.H.Center of Non-Crystallaine Res., Seoul, KoreaUNSPECIFIED
Kim, W.T.Dep.Optical Eng.,Cheognhi Uni, KoreaUNSPECIFIED
Eckert, JürgenIFW DresdenUNSPECIFIED
Date:January 2013
Journal or Publication Title:Acta Materialia
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:61
DOI :10.1016/j.actamat2012.12.031
Page Range:pp. 2102-2112
Publisher:Elsevier
ISSN:1359-6454
Status:Published
Keywords:Monotectic solidification; Bulk metallic glasses; Phase separation; Rapid solidification; Microstructure
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Research under Space Conditions
DLR - Research area:Raumfahrt
DLR - Program:R FR - Forschung unter Weltraumbedingungen
DLR - Research theme (Project):R - Vorhaben Materialwissenschaftliche Forschung (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space
Deposited By: Schwan, Marina
Deposited On:04 Apr 2013 15:28
Last Modified:04 Apr 2013 15:28

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