Microstructure development during dissimilar welding: Case of laser welding of Ti with Ni involving intermetallic phase formation

Chatterjee, S and Abinandanan, TA and Chattopadhyay, K (2006) Microstructure development during dissimilar welding: Case of laser welding of Ti with Ni involving intermetallic phase formation. In: Journal of Material Science, 41 (3). pp. 643-652.

PDF Microstructure_development.pdf - Published Version Restricted to Registered users only Download (6MB) | Request a copy

Abstract

Development of solidification microstructure in a laser welded Ti/Ni dissimilar binary couple is presented. At the fusion interfaces in both Ti and Ni, growth of the base metal grains into the weld pool is inhibited by the resence of composition gradients in the melt. $Ti_2Ni$ dendrites grow toward the base metal at the Ti fusion interface. In the Ni side, appearance of a nickel solid solution phase is followed by layers of $Ni_3Ti$, $Ni_3Ti+NiTi$ eutectic, and NiTi. NiTi dendrites and $Ti_2Ni$ constitute the microstructure in the middle of the weld. Isolated titanium dendrites are observed throughout the weld, but their preferential occurrence toward the top surface of the weld is more prominent. Results are rationalised on the basis of interplay of the transport processes in the weld with the thermodynamics of the Ti-Ni system.

Item Type:	Journal Article
Publication:	Journal of Material Science
Publisher:	Springer
Additional Information:	Copyright of this article belongs to Springer.
Keywords:	Dissimilar welding;Solidification microstructure;Ti-Ni system
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	25 Aug 2008
Last Modified:	22 Feb 2012 08:38
URI:	http://eprints.iisc.ac.in/id/eprint/6520

Actions (login required)

View Item