Microstructural evolution during laser resolidification of Fe-25 atom percent Ge alloy

Biswas, Krishanu ; Chattopadhyay, Kamanio (2007) Microstructural evolution during laser resolidification of Fe-25 atom percent Ge alloy Metallurgical and Materials Transactions A, 38 (7). pp. 1395-1406. ISSN 1073-5623

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Official URL: http://www.springerlink.com/content/04363031660l45...

Related URL: http://dx.doi.org/10.1007/s11661-007-9167-9


The microstructural evolution of concentrated alloys is relatively less understood both in terms of experiments as well as theory. Laser resolidification represents a powerful technique to study the solidification behavior under controlled growth conditions. This technique has been utilized in the current study to probe experimentally microstructural selection during rapid solidification of concentrated Fe-25 atom pct Ge alloy. Under the equilibrium solidification condition, the alloy undergoes a peritectic reaction between ordered α2 (B2) and its liquid, leading to the formation of ordered hexagonal intermetallic phase ε (DO19). In general, the as-cast microstructure consists of ε phase and ε-β eutectic and α2 that forms as a result of an incomplete peritectic reaction. With increasing laser scanning velocity, the solidification front undergoes a number of morphological transitions leading to the selection of the microstructure corresponding to metastable α 2/β eutectic to α2 dendrite + α2/β eutectic to α 2dendrite. The transition velocities as obtained from the experiments are well characterized. The microstructural selection is discussed using competitive growth kinetics.

Item Type:Article
Source:Copyright of this article belongs to Springer-Verlag.
ID Code:6563
Deposited On:22 Oct 2010 06:39
Last Modified:16 May 2016 16:53

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