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

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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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Notes

  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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Acknowledgments

The authors would like to acknowledge the (CSIR) and Department of Science and Technology (DST), Govt. of India for funding and Dr. Rolf Galun, Caterpillar Inc. for laser processing of samples.

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Authors and Affiliations

  1. Department of Materials and Metallurgical Engineering, Indian Institute of Technology, Kanpur, U.P., 208016, India

    Krishanu Biswas (Assistant Professor)

  2. Department of Materials Engineering, Indian Institute of Science, Bangalore, 560 012, India

    Kamanio Chattopadhyay (Professor)

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  1. Krishanu Biswas
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  2. Kamanio Chattopadhyay
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Correspondence to Krishanu Biswas.

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Manuscript submitted April 26, 2009.

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Biswas, K., Chattopadhyay, K. Microstructural Evolution during Laser Resolidification of Fe-18 At. Pct Ge Alloy. Metall Mater Trans A 41, 574–582 (2010). https://doi.org/10.1007/s11661-009-0084-y

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