Exploring ω and α phase transformations in metastable β Ti-5553 alloy by in situ thermo-analytical techniques

Author(s)

Silva, L. S. ; Opini, V. C. ; Sangali, M. ; Rodrigues, J. F. Q. ; Caram, R.

• Document type: Journal article
• Source: JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY; v. N/A, p. 11-pg., 2025-04-12.

Abstract

This study employed thermo-analytical tools at different thermally treated samples to evaluate omega and alpha phase transformations in the Ti-5553 alloy. The omega dissolution and alpha precipitation were studied utilizing simultaneous thermal analysis (STA), X-ray diffraction (XRD), dilatometry, Vickers hardness measurement, optical microscopy, and scanning electron microscopy. Besides conventional XRD, in situ experiments were performed using a synchrotron light source. Considering the beta-quenched condition as the initial state, five different phase transformations were detected, which include the omega precipitation and dissolution between 420 and 670 K (the low intensity of the omega dissolution thermal event required studying different aging treatments), and the alpha precipitation in three different mechanisms above 670 K. The aging at 573 K for 72 h allowed better detection of the omega dissolution event and was revealed to be an important experimental approach for phase transformations study. A contrast among in situ XRD, STA, and dilatometry techniques was verified in the thermal behavior of beta-quenched and aged Ti-5553 alloy. The aging thermal treatments allowed the detection of omega phase dissolution by in situ XRD using a Cu K alpha source, which was not achieved even using a synchrotron light source in the not-aged condition. These results exemplify the potential of experimental exploitation through thermo-analytical techniques and thermal treatments. (AU)

• FAPESP's process: 18/18293-8 - Titanium alloys: phase transformations and additive manufacturing applied to obtaining functionally graded materials
• Grantee: Rubens Caram Junior
• Support Opportunities: Research Projects - Thematic Grants
• FAPESP's process: 23/04844-0 - MANUFACTURE OF COMPONENTS WITH FUNCTIONAL GRADIENTS BY DEPOSITION
• Grantee: Leandro Santos da Silva
• Support Opportunities: Scholarships in Brazil - Post-Doctoral