Abstract
Ultrasonic velocity and attenuation measurements of hot-forged β-type Ti–40Nb (%wt) alloy were realized in cooling–heating cycles between 130 and 300 K. The anelastic spectra evidence a complex nature of structural evolution mainly associated with martensitic-like phase transitions. In particular, evident anomalies at around 180 K and 160 K were not previously reported using ultrasonic measurements. X-ray diffraction (XRD) and scanning electron microscopy (SEM) were used at room temperature to characterize the sample previously to ultrasonic measurements. Differential scanning calorimetry (DSC) was used to add complementary results at low temperatures. The results detected the coexistence of β and martensite α″ phases at room temperature, with traces of ⍵ phase. The frequency-independent ultrasonic anomalies at around 190 K and 160 K suggest the occurrence of the reversible two-stage martensitic transitions involving β → ⍵ and α″ → ⍵ phases and suppression of the β → α transition in the hot-forged sample.
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Acknowledgments
The authors acknowledge the Brazilian funding agencies: FAPESP, CAPES, CNPq, and the Uruguayan institutions: ANII, CSIC-Udelar, and PEDECIBA.
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This work was supported by FAPESP grant #2015/50.280-5, CAPES Finance Code 001;CNPq grant #308.204/2017-4; #304.073/2019-9 from Brazil, and Uruguay funding agency PEDECIBA (Program for the Development of Basic Sciences).
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AOMG contributed to conceptualization, methodology, investigation, funding acquisition, data curation, writing—original draft, writing—review and editing, visualization, and supervision. DRNC contributed to data curation, writing—original draft, writing—review and editing, and visualization. PSdSJ contributed to conceptualization, methodology, resources, data curation, writing—original draft, writing—review, and editing; RFMdS contributed to investigation, data curation, and writing—original draft. JAMC contributed to investigation, data curation, and writing—original draft. CRMA contributed to conceptualization, methodology, writing—original draft, writing—review and editing, supervision, and funding acquisition. CRG contributed to conceptualization, methodology, writing—original draft, writing—review and editing, supervision, and funding acquisition.
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Gobbi, A.O.M., Correa, D.R.N., Junior, P.S.S. et al. Ultrasonic study of polycrystalline Ti–40Nb alloys at cryogenic temperatures. MRS Advances 9, 108–112 (2024). https://doi.org/10.1557/s43580-023-00653-8
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DOI: https://doi.org/10.1557/s43580-023-00653-8