This article offers a study of a mechanical response of the TiAl/Steel brazed joint. The (i) intermetallic reaction layer's phases, (ii) the residue filler, and the (iii) base metals constitute the complex structure considered. The study features TiAl and 42CrMo steel brazed with an AgCuTi filler metal. The analysis includes the microstructural study and an evaluation of mechanical properties of the brazed joint. In addition, the fracture behavior of the joint under a tensile loading in situ is studied in the context of the impact that reaction phases may have on the joint properties. The results of the study indicate that the complex joint structure is due to the presence of a ternary intermetallic reaction layer, as well as the presence of intermetallics in the filler residue. The multilayered structure includes Ti 3Al+AlCuTi+AlCu2Ti ternary intermetallic reaction layer, Ag(Cu) residue filler, AlCu2Ti intermetallic dispersed in the residue braze and TiC layer. The hardness sequence of the structure has been established. The crack initiation, its propagation, and an ultimate fracture are associated primarily with Ti3Al+AlCuTi+AlCu2Ti ternary intermetalics layer.
|Number of pages||7|
|Journal||Journal of Materials Science|
|State||Published - Feb 2014|
Bibliographical noteFunding Information:
Acknowledgements This study was supported by National Natural Science Foundation of China (No.50975062), Science Foundation of Educational Department of Jiangxi Province (No.GGJJ13064) and the Funding for Young Scientists of Jiangxi Province (2010DQ01000), China. The first author (YL) acknowledges the support from the China Scholarship Council for a visiting scholar position in the Brazing Laboratory of the College of Engineering, University of Kentucky. The logistics and facility support of the Institute for Sustainable Manufacturing at the University of Kentucky is acknowledged as well. The research work of Prof. D. P. Sekulic and W. Liu has been funded by the US National Science Foundation under grant no. CBET-123581 for 2012.
ASJC Scopus subject areas
- Materials Science (all)
- Mechanics of Materials
- Mechanical Engineering