Journal article
The sintering, sintered microstructure and mechanical properties of Ti-Fe-Si alloys
YF Yang, SD Luo, GB Schaffer, M Qian
Metallurgical and Materials Transactions A Physical Metallurgy and Materials Science | SPRINGER | Published : 2012
Abstract
A systematic study has been conducted of the sintering, sintered microstructure and tensile properties of a range of lower cost Ti-Fe-Si alloys, including Ti-3Fe-(0-4)Si, Ti-(3-6)Fe-0.5Si, and Ti-(3-6)Fe-1Si (in wt pct throughout). Small additions of Si (≤1 pct) noticeably improve the as-sintered tensile properties of Ti-3Fe alloy, including the ductility, with fine titanium silicides (Ti5Si3) being dispersed in both the α and β phases. Conversely, additions of >1 pct Si produce coarse and/or networked Ti5Si3 silicides along the grain boundaries leading to predominantly intergranular fracture and, hence, poor ductility, although the tensile strength continues to increase because of the reinf..
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Funding Acknowledgements
This work was funded by the Australian Research Council (ARC) through the Center of Excellence for Design in Light Metals and an Australian Postdoctoral Fellowship for Y.F. Yang. Dr. Ming Yan of The University of Queensland performed the TEM work for this paper (Figure 8).