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

Microstructure development during dissimilar welding: Case of laser welding of Ti with Ni involving intermetallic phase formation 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 presence of composition gradients in the melt. Ti 2 Ni 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 3 Ti, Ni 3 Ti+NiTi eutectic, and NiTi. NiTi dendrites and Ti 2 Ni 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Materials Science Springer Journals
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