Evolution of face-centered cubic Ti alloys transformation by X-ray diffraction profile analysis in mechanical alloying
Edgar Pio (Universidad de Santiago de Chile, Universidad Técnica Federico Santa María)
Ariosto Medina (Universidad Michoacana de San Nicolás de Hidalgo)
Carola Martínez (University of La Frontera)
Felipe M. Cerda (TU Delft - Team Kevin Rossi, Universidad de Santiago de Chile)
Claudio Aguilar (Universidad Técnica Federico Santa María)
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Abstract
Four titanium alloys (Ti-Ta, Ti-Ta-Sn, Ti-Ta-Mn, and Ti-Nb-Sn) were synthesized by mechanical alloying (MA) in a planetary mill in different times between 2 h and 100 h. The microstructure characterization was made by X-ray diffraction (XRD), in which the Rietveld method was applied to analyze the diffraction patterns. The study demonstrated that after short milling times between 2 h and 30 h, the fraction of hexagonal close-packed (hcp) phase decreases; at the same time, the formation of body-centered cubic (bcc) and face-centered cubic (fcc) Ti phases are promoted. Additionally, after 30 h of MA, the full transformation of hcp-Ti was observed, and the bcc-Ti to fcc-Ti phase transformation took place until 50 h. The results suggest that the addition of Ta and Sn promotes the fcc-Ti phase formation, obtaining 100% of this phase at 50 h onwards, whereas Nb and Mn show the opposite effect.
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