In this section, you can access to the latest technical information related to the FUTURE project topic.

Fabrication of Titanium Aluminides via Powder?Cored Wire Arc Additive Manufacturing: Microstructural and Mechanical Characterization

An innovative powder?cored wire arc additive manufacturing process is proposed to fabricate large?size and defect?free ??TiAl alloy thin?walled parts. The evolution of phase and microstructure characteristics along the building direction are discussed in detail. These results offer a valuable reference for choosing appropriate composition during TiAl alloy fabricated using PC?WAAM technology.Herein, an innovative powder?cored wire arc additive manufacturing (PC?WAAM) process is proposed to fabricate ??TiAl thin?walled intermetallic alloy. The metallography, phase composition, and mechanical properties at different thin?wall locations are characterized. The results show that the alternatively distributed layer?like microstructure composed of ?2 (Ti3Al) and ? (TiAl) phases is obtained along the building direction. The content of ?2 phase exhibits the tendency of decreasing from the bottom to top region. This unique microstructure characteristic is closely related to the typical thermal cycling history during deposition. Moreover, the tensile strength and microhardness of the top region are lower than the middle and bottom region. In general, the current PC?WAAM technique shows promising capability of fabricating ??TiAl intermetallic alloy with low cost. This work becomes a valuable reference for understanding the evolution mechanism of microstructure and paves the way for the flexible and customized additive manufacturing of ??TiAl alloy.

» Author: Liang Zhang, Ting Wang, Bo Yuan, Bin Yu, Zhichao Chen

» Publication Date: 26/04/2023

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