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Microstructure evolution in rapidly solidified immiscible alloys

Schmidt-Hohagen, Frank and Ratke, Lorenz and Zhao, Jiuzhou (2006) Microstructure evolution in rapidly solidified immiscible alloys. In: Verhandlungen der Deutschen Physikalischen Gesellschaft, 41, p. 417. 21. General Conference of the EPS Condensed Matter Division in conjunction with AKF-Frühjahrstagung der Deutschen Physikalischen Gesellschaft, 2006-03-26 - 2006-03-31, Dresden (Germany). ISSN 0420-0195.

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When a hypermonotectic alloy is cooled from the single-phase liquid state into the miscibility gap, the components are no longer miscible and two liquid phases develop. Generally the liquid-liquid decomposition of an initially homogenous liquid begins with the nucleation of the liquid minority phase in the form of droplets, which grow by diffusion. Reaching the non-variant monotectic reaction temperature the matrix liquid decomposes into a solid and a second phase, being not distinguishable from the liquid minority phase that emerged in the miscibility gap. The size spectra of the drops of both processes merge the larger the cooling rate. Within a suitable interval of cooling rates they become, however, distinguishable and then the spectra stemming from the liquid-liquid decomposition gives unique access to the nucleation process inside the miscibility gap. Immiscible alloys like Al-Pb offer a great potential as for instance self-lubricating bearings in automotive applications, if a finely dispersed microstructure is achieved. This can be obtained under conditions of rapid cooling. In order to explore the potential of rapid solidification of immiscible alloys, investigations of the microstructure of different Al-Pb alloys were carried out, varying over a wide range of alloy-concentrations and cooling rates. The experimental results, obtained with the help of different methods, are compared with numerical simulations of the decomposition and the microstructure evolution process.

Item URL in elib:https://elib.dlr.de/43967/
Document Type:Conference or Workshop Item (Speech)
Title:Microstructure evolution in rapidly solidified immiscible alloys
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Zhao, JiuzhouInstitute of Metal Research, Chinese Academy of Sciences, Shenyang, ChinaUNSPECIFIED
Date:March 2006
Journal or Publication Title:Verhandlungen der Deutschen Physikalischen Gesellschaft
Refereed publication:No
Open Access:No
Gold Open Access:No
In ISI Web of Science:No
Volume: 41
Page Range:p. 417
EditorsEmailEditor's ORCID iD
Deutsche Physikalische Gesellschaft (DPG), UNSPECIFIEDUNSPECIFIED
Series Name:VI
Keywords:Immiscible alloys, miscibility gap, liquid-liquid decomposition, monotectic reaction, rapid solidification
Event Title:21. General Conference of the EPS Condensed Matter Division in conjunction with AKF-Frühjahrstagung der Deutschen Physikalischen Gesellschaft
Event Location:Dresden (Germany)
Event Type:international Conference
Event Dates:2006-03-26 - 2006-03-31
Organizer:Deutsche Physikalische Gesellschaft
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W FR - Forschung unter Weltraumbedingungen (old)
DLR - Research area:Space
DLR - Program:W FR - Forschung unter Weltraumbedingungen
DLR - Research theme (Project):W - Vorhaben Materialforschung unter Mikro-g (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Physics in Space > Institute of Space Simulation > Center for Solidification of Undercooled Melts (ZEUS)
Deposited By: Schmidt-Hohagen, Frank
Deposited On:21 Jun 2006
Last Modified:27 Apr 2009 12:56

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