Product Code: ICAL07_408

Microstructural Evolution in Laser Rapid Forming of a Graded Titanium-Nickel Alloy
Authors:
Haiou Yang, Northwestern Polytechnical University; xi'an Peoples Republic of China
Xin Lin, Northwestern Polytechnical University; Xi'an Peoples Republic of China
Jing Chen, Northwestern Polytechnical University; xi'an Peoples Republic of China
T.M. Yue, The Hong Kong Polytechnic University; Hong Kong Hong Kong
Weidong Huang, Northwestern Polytechnical University; Xi'an Peoples Republic of China
Presented at ICALEO 2007

The fabrication of near net shaping parts with functionally graded materials using laser rapid forming have been considered as a signification and promising technology. In this paper, a graded binary Titanium-Nickel alloy has been deposited using laser rapid forming from a blend of elemental Ti and Ni powders. A compositional gradient, from elemental Ti to Ti-23.2at%Ni, was achieved within a length of ~25mm. The solidification behavior and the morphological evolution of Ti/Ni functionally graded material formed by a laser rapid forming process were investigated. a series of phase evolutions: a-a+b-a+b+Ti2Ni-b+Ti2Ni along the compositional gradient have occurred. Phase formation and microstructure evolution along the compositional gradient direction was analyzed.