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Erschienen in: Metallurgical and Materials Transactions A 3/2010

01.03.2010

Microstructural Evolution during Laser Resolidification of Fe-18 At. Pct Ge Alloy

verfasst von: Krishanu Biswas, Kamanio Chattopadhyay

Erschienen in: Metallurgical and Materials Transactions A | Ausgabe 3/2010

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Abstract

The technique of laser resolidification has been used to study the rapid solidification behavior of concentrated Fe-18 at. pct Ge alloy. The microstructural evolution has been studied as a function of scanning rate of laser beam. Scanning electron microscopy (SEM) reveals the formation of a two-layer (designated as “A” and “B”) microstructure in the remelted pool. The A layer shows a band consisting of a network of interconnected channels and walls, quite similar to cell walls. The B layer shows dendritic growth. Transmission electron microscopic observations reveal the formation of bcc α-FeGe in the B layer. Laser melting has been found to play an important role in formation of the A layer. Microstructural evolution in B has been analyzed using the competitive growth criterion, and formation of bcc α-FeGe has been rationalized in the remelted layers.

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Fußnoten
1
JEOL is a trademark of Japan Electron Optics Ltd., Tokyo.
 
2
Efforts are made to apply the expression of the velocity-dependent partition coefficient given by Aziz and Kaplan,[28] and the interface temperatures (T i ) of the respective phases have determined as a function of growth velocity. The difference in the T i value is about 3.5 pct from the values reported here.
 
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Metadaten
Titel
Microstructural Evolution during Laser Resolidification of Fe-18 At. Pct Ge Alloy
verfasst von
Krishanu Biswas
Kamanio Chattopadhyay
Publikationsdatum
01.03.2010
Verlag
Springer US
Erschienen in
Metallurgical and Materials Transactions A / Ausgabe 3/2010
Print ISSN: 1073-5623
Elektronische ISSN: 1543-1940
DOI
https://doi.org/10.1007/s11661-009-0084-y

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