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http://dx.doi.org/10.3740/MRSK.2019.29.4.258

Interfacial Properties of Friction-Welded TiAl and SCM440 Alloys with Cu as Insert Metal  

Park, Sung-Hyun (School of Materials Science and Engineering, Kumoh National Institute of Technology (KIT))
Kim, Ki-Young (School of Materials Science and Engineering, Kumoh National Institute of Technology (KIT))
Park, Jong-Moon (School of Materials Science and Engineering, Kumoh National Institute of Technology (KIT))
Choi, In-Chul (School of Materials Science and Engineering, Kumoh National Institute of Technology (KIT))
Ito, Kazuhiro (Joining and Welding Research Institute, Osaka University)
Oh, Myung-Hoon (School of Materials Science and Engineering, Kumoh National Institute of Technology (KIT))
Publication Information
Korean Journal of Materials Research / v.29, no.4, 2019 , pp. 258-263 More about this Journal
Abstract
Since the directly bonded interface between TiAl alloy and SCM440 includes lots of cracks and generated intermetallic compounds(IMCs) such as TiC, FeTi, and $Fe_2Ti$, the interfacial strength can be significantly reduced. Therefore, in this study, Cu is selected as an insert metal to improve the lower tensile strength of the joint between TiAl alloy and SCM440 during friction welding. As a result, newly formed IMCs, such as $Cu_2TiAl$, CuTiAl, and $TiCu_2$, are found at the interface between TiAl alloy and Cu layer and the thickness of IMCs layers is found to vary with friction time. In addition, to determine the relationship between the thickness of the IMCs and the strength of the welded interfaces, a tensile test was performed using sub-size specimens obtained from the center to the peripheral region of the friction-welded interface. The results are discussed in terms of changes in the IMCs and the underlying deformation mechanism. Finally, it is found that the friction welding process needs to be idealized because IMCs generated between TiAl alloy and Cu act to not only increase the bonding strength but also form an easy path of fracture propagation.
Keywords
TiAl; insert metal; interface; intermetallics; microstructure;
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