700 °C Isothermal Section of the Al-Ti-Si Ternary Phase Diagram

Thermodynamic investigation on phase formation in the Al–Si rich region of Al–Si–Ti system

“…These two composition ranges are close to the results between 620 and 727°C reported in Refs. [15][16][17], but different from the values at 727°C published in Ref. [14].…”

Assessment of the Ti-Rich Corner of the Ti-Si Phase Diagram: The Recent Dispute About the Eutectoid Reaction

“…In 2010 Costa et al 17 observed the presence of Ti 3 Si phase in Ti-13Si and Ti-20Si alloys after isothermal heat-treatment at 1273K for various times by XRD. In 2014 Li et al 18 observed the presence of Ti 3 Si phase in a Ti-15Si-5Al alloy after isothermal heat-treatment for 45 days at 973K using microanalysis coupled with XRD. Finally, in 2014 Kozlov et al 19 observed the presence of Ti 3 Si phase in Ti-Si and Ti-Ge-Si alloys after isothermal treatments of at 943K for 720 hours by XRD.…”

“…In the light of the dispute over the stability of Ti 3 Si phase in Ti-X-Si engineering alloys [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] , the present work will calculate and compare the Ti-rich corner of the "stable" and "metastable" Ti-Si phase diagrams, by assuming that Ti 3 Si is the stable phase in the eutectoid reaction, Ti(β)  Ti(α)+ Ti 3 Si. These results will be discussed in order to inspire further experimental work on critical regions of the Ti-Si phase diagram 11 .…”

“…It is worth mentioning that most experimental works on the Ti-Si and Ti-Si-X systems [1][2][3][4][5][12][13][14][15][16][17][18][19][20] did not perform chemical analysis of the samples after long isothermal heat-treatments to insure the lack of interstitial contamination. Some of these works, however, were careful enough to apply hardness measurements of control samples (before and after heat-treatments) to audit possible and critical interstitial contamination during the experimental work [1][2][3][4][6][7][12][13][14] .…”

Assessment of the Ti-rich corner of the Ti-Si phase diagram using two sublattices to describe the Ti5Si3 phase

“…Azevedo (Azevedo, 1996;Azevedo and Flower, 1999;Azevedo and Flower, 2000;Azevedo and Flower, 2002) and Bulanova (Bulanova et al, 1997) identified the presence of Ti 5 Si phase (instead of Ti 3 Si) after long isothermal heat treatments below the eutectoid temperature. By contrast, the presence of Ti 3 Si phase was observed by other investigations (Kozlov and Pavlyuk, 2004;Ramos et al, 2006;Costa et al;Li et al, 2014). In 2010, the stability of intermetallic phases in the Ti-Si system was studied by ab-initio calculations, indicating that the stability of Ti 3 Si phase was controversial (Colinet and Tedenac, 2010).…”