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Resolidification behaviour of laser surface-melted metals and alloys

Swamy, VT and Ranganathan, S and Chattopadhyay, K (1995) Resolidification behaviour of laser surface-melted metals and alloys. In: 2nd Australian International Conference on Surface Engineering - Coatings and Surface Treatments in Manufacturing ADELAIDE,, MAR 07-10, 1994, Adelaide, Australia.

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The solidification behaviour is described of two pure metals (Bi and Ni) and two eutectic alloys (A1-Ge and AI-Cu) under nonequilibrium conditions, in particular the microsecond pulsed laser surface melting. The resolidification behaviour of bismuth shows that epitaxial regrowth is the dominant mechanism. For mixed grain size, regrowth of larger grains dominates the microstructure and can result in the development of texture. In the case of nickel, epitaxial growth has been noted. For lower energy pulse-melted pool, grain refinement takes place, indicating nucleation of fresh nickel grains. The A1-Ge eutectic alloy indicates the nucleation and columnar growth of a metastable monoclinic phase from the melt-substrate interface at a high power density laser irradiation. An equiaxed microstructure containing the same monoclinic phase is obtained at a lower power density laser irradiation. It is shown that the requirement of solution partition acts as a barrier to eutectic regrowth from the substrate. The laser-melted pool of A1-Cu eutectic alloy includes columnar growth of c~-A1 and 0-A12Cu phase followed by the dendritic growth of A12Cu phase with ct-Al forming at the interdendritic space. In addition, a banded microstructure was observed in the resolidified laser-melted pool.

Item Type: Conference Paper
Publisher: Elsavier
Additional Information: Copyright of this apublication belongs to Elsavier.
Keywords: Solidification of metals;Pulsed laser;Solidification of alloys.
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Date Deposited: 21 Apr 2009 08:28
Last Modified: 19 Sep 2010 05:30
URI: http://eprints.iisc.ac.in/id/eprint/19779

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