The Sintering, Sintered Microstructure and Mechanical ... - CiteSeerX
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The Sintering, Sintered Microstructure and Mechanical Properties of Ti-Fe-Si Alloys Y.F. YANG, S.D. LUO, G.B. SCHAFFER, and M. QIAN 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 a and b 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 reinforcement by Ti5Si3. Increasing the Fe content in the Ti-xFe-0.5/ 1.0Si alloys above 3 pct markedly increases the average grain size and changes the morphology of the a-phase phase to much thinner and more acicular laths. Consequently, the ductility drops to
