Abstract:The thermodynamic optimization of Ti-Si-X systems requires that their respective binary systems are constantly updated. The Ti-Si system has been experimentally investigated since the 1950s and these critical experimental data can be employed to calculate the Ti-Si phase diagram using thermodynamic modeling. The most recent assessment of the Ti-Si system was performed in 1998, showing the presence of stoichiometric Ti 3 Si as stable phase. In the light of the dispute over the stability of Ti 3 Si phase in the … Show more
“…The shape of this phase field resembles a previous result, which described the Ti 5 Si 3 phase as Ti 3 Ti 2 (Ti,Si) 3 . Figure 2-b shows a detail of the Ti-rich corner near the eutectoid reaction, comparing the present assessment with previous experimental (Plitcha et al 1977;Plitcha and Aaronson, 1978) and calculated (Cost, 1998;Fiore et al 2016) phase diagrams. The present assessment showed smaller Si-solubility in the Ti(α) and Ti(β) phases when compared to the calculated phase diagram using COST 507 database (Cost, 1998) and a slightly higher value for the eutectoid temperature.…”
Section: Resultssupporting
confidence: 70%
“…The other values were found for the β +Ti 5 Si 3 →Ti 3 Si, β→α+Ti 3 Si and β→α+Ti 5 Si 3 reactions, indicating that further experiments in these critical regions of the Ti-rich corner of the Ti-Si phase diagram are needed to improve the results of the present optimization procedures; and to define which one of the eutectoid reactions is actually the stable one (β→α+Ti 3 Si or β→α+Ti 5 Si 3 ). (Svechnikov et al 1970;Fiore et al 2016), except for the narrower solubility range of the Ti 5 Si 3 phase field. Figure 1-b shows a detail of the Ti-rich corner near the eutectoid reaction, indicating that there are no experimental data to validate the position of the calculated Ti(α) and Ti(β) solvus lines.…”
The thermodynamic optimization of Ti-X-Si systems requires that their respective binary systems be constantly updated. The most recent assessments of the Ti-Si phase diagrams used three sublattices to describe the Ti 5 Si 3 phase. The stable version of this phase diagram indicated the presence of Ti(β)+Ti 5 Si 3 →Ti 3 Si and Ti(β)→Ti(α)+Ti 3 Si reactions in the Ti-rich corner, while the metastable version featured the presence of a Ti(β)→Ti(α)+Ti 5 Si 3 reaction. The present investigation assessed these phase diagrams using two sublattices to describe the Ti 5 Si 3 phase in order to simplify the optimization of Ti-X-Si systems.
“…The shape of this phase field resembles a previous result, which described the Ti 5 Si 3 phase as Ti 3 Ti 2 (Ti,Si) 3 . Figure 2-b shows a detail of the Ti-rich corner near the eutectoid reaction, comparing the present assessment with previous experimental (Plitcha et al 1977;Plitcha and Aaronson, 1978) and calculated (Cost, 1998;Fiore et al 2016) phase diagrams. The present assessment showed smaller Si-solubility in the Ti(α) and Ti(β) phases when compared to the calculated phase diagram using COST 507 database (Cost, 1998) and a slightly higher value for the eutectoid temperature.…”
Section: Resultssupporting
confidence: 70%
“…The other values were found for the β +Ti 5 Si 3 →Ti 3 Si, β→α+Ti 3 Si and β→α+Ti 5 Si 3 reactions, indicating that further experiments in these critical regions of the Ti-rich corner of the Ti-Si phase diagram are needed to improve the results of the present optimization procedures; and to define which one of the eutectoid reactions is actually the stable one (β→α+Ti 3 Si or β→α+Ti 5 Si 3 ). (Svechnikov et al 1970;Fiore et al 2016), except for the narrower solubility range of the Ti 5 Si 3 phase field. Figure 1-b shows a detail of the Ti-rich corner near the eutectoid reaction, indicating that there are no experimental data to validate the position of the calculated Ti(α) and Ti(β) solvus lines.…”
The thermodynamic optimization of Ti-X-Si systems requires that their respective binary systems be constantly updated. The most recent assessments of the Ti-Si phase diagrams used three sublattices to describe the Ti 5 Si 3 phase. The stable version of this phase diagram indicated the presence of Ti(β)+Ti 5 Si 3 →Ti 3 Si and Ti(β)→Ti(α)+Ti 3 Si reactions in the Ti-rich corner, while the metastable version featured the presence of a Ti(β)→Ti(α)+Ti 5 Si 3 reaction. The present investigation assessed these phase diagrams using two sublattices to describe the Ti 5 Si 3 phase in order to simplify the optimization of Ti-X-Si systems.
“…As the results, local oxygen concentrations at prior-¢ grain boundaries were reduced, resulting in the suppression of grain boundary ¡ formation. The role of titanium boride in scavenging oxygen seems to be similar to that of Ti 2 C. In the TiSi phase diagram, ¡ and ¢ phases are equilibrium with Ti 3 Si below 1444 K; 25) Ti 5 Si 3 is a metastable phase so that it is possible to work as a scavenger in Ti-170.3Si in this study. Figure 5 shows the Vickers hardness and tensile properties of Ti-170Si and Ti-170.3Si.…”
The effect of Si addition on the microstructure and mechanical properties of a near-¢ titanium alloy Ti-17 with fully lamella microstructure was investigated. It was found that the microstructure of Ti-17 with silicon exhibited the absence of a continuously thick ¡ layer along prior-¢ grain boundaries (grain boundary ¡), while the grain boundary ¡ was distinctively formed in Ti-17 without Si. The formation of (Ti, Zr) silicide particles at the prior-¢ grain interior and its grain boundaries were observed, and the presence of these particles were related to the disappearance of grain boundary ¡ similar to the oxygen scavenging effect of boride particles reported previously. With regard to mechanical properties, Ti-17 with silicon exhibits higher strength and lower ductility compared with Ti-17 without Si. Ductile transgranular fracture morphology was observed even on the fracture surface of Ti-17 with Si after tensile test. [
“…The mole fractions of BG10 and BG30 for Ti:Si were 97.4:2.6 and 90.5:9.5, respectively. From the TiSi phase diagram, 31) Si mole fractions of 2.6 and 9.5 can form the Ti 5 Si 3 phase. In addition, the mixing enthalpies for TiAl, TiV, and TiSi were ¹30, ¹2, and ¹66 kJ•mol ¹1 , respectively.…”
Selective laser melting (SLM) is widely used for the additive manufacturing (AM) of metal components, which can produce net shape complex geometries. Novel titanium alloy/bioactive glass composites were successfully fabricated via SLM method for biomedical applications. The fabricated composites contained a Ti 5 Si 3 phase, which resulted from the reaction between the titanium alloy and the bioactive glass. The phase can improve the bonding strength between composite and bone. Additionally, the remained amorphous bioactive glass phase could improve bioactivity. The present study opens a new avenue for developing new titanium alloy/bioactive glass composites with optimal bioactivity and bonding strength with the bone.
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