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Exploring the Ti-5553 phase transformations utilizing in-situ high-temperature laser-scanning confocal microscopy

Journal Article


Abstract


  • © 2019 Elsevier Inc. Recently, the β metastable Ti-5553 alloy has attracted significant interest owing to the possibility of achieving excellent mechanical properties. In this study, for the first time, the Ti-5553 phase transformations were investigated using high-temperature laser-scanning confocal microscopy (HT-LSCM). During the continuous heating of an aged sample, the α phase dissolution was not clearly visible owing to the remaining grooves of former grain and interphase boundaries. However, the continuous cooling experiments (from the β field) showed that the α phase precipitation started preferentially at grain boundaries. With the increase in cooling rate, the α precipitates became more refined and the supercooling necessary to promote allotriomorphic precipitation increased. At a cooling rate of 100 °C min−1, no α phase was observed in the analyzed field of view. A higher oxygen content was suggested to contribute to the microstructural differences between the free surface and bulk. The volume fraction of the α phase was lower than that obtained on the original surface at cooling rates of 5, 25, and 50 °C min−1, while only minor differences were observed at cooling rates of 100 and 250 °C min−1. The α phase precipitation was analyzed in detail. The HT-LSCM technique can be a useful method for the analyses of solid-state phase transformations in Ti alloys.

Authors


  •   Campo, Kaio (external author)
  •   Fanton, Leonardo (external author)
  •   de Mello, Mariana (external author)
  •   Moon, Suk Chun
  •   Dippenaar, Rian J.
  •   Caram, Rubens (external author)

Publication Date


  • 2020

Citation


  • Campo, K., Fanton, L., de Mello, M., Moon, S., Dippenaar, R. & Caram, R. (2020). Exploring the Ti-5553 phase transformations utilizing in-situ high-temperature laser-scanning confocal microscopy. Materials Characterization, 159

Scopus Eid


  • 2-s2.0-85076878199

Volume


  • 159

Place Of Publication


  • United States

Abstract


  • © 2019 Elsevier Inc. Recently, the β metastable Ti-5553 alloy has attracted significant interest owing to the possibility of achieving excellent mechanical properties. In this study, for the first time, the Ti-5553 phase transformations were investigated using high-temperature laser-scanning confocal microscopy (HT-LSCM). During the continuous heating of an aged sample, the α phase dissolution was not clearly visible owing to the remaining grooves of former grain and interphase boundaries. However, the continuous cooling experiments (from the β field) showed that the α phase precipitation started preferentially at grain boundaries. With the increase in cooling rate, the α precipitates became more refined and the supercooling necessary to promote allotriomorphic precipitation increased. At a cooling rate of 100 °C min−1, no α phase was observed in the analyzed field of view. A higher oxygen content was suggested to contribute to the microstructural differences between the free surface and bulk. The volume fraction of the α phase was lower than that obtained on the original surface at cooling rates of 5, 25, and 50 °C min−1, while only minor differences were observed at cooling rates of 100 and 250 °C min−1. The α phase precipitation was analyzed in detail. The HT-LSCM technique can be a useful method for the analyses of solid-state phase transformations in Ti alloys.

Authors


  •   Campo, Kaio (external author)
  •   Fanton, Leonardo (external author)
  •   de Mello, Mariana (external author)
  •   Moon, Suk Chun
  •   Dippenaar, Rian J.
  •   Caram, Rubens (external author)

Publication Date


  • 2020

Citation


  • Campo, K., Fanton, L., de Mello, M., Moon, S., Dippenaar, R. & Caram, R. (2020). Exploring the Ti-5553 phase transformations utilizing in-situ high-temperature laser-scanning confocal microscopy. Materials Characterization, 159

Scopus Eid


  • 2-s2.0-85076878199

Volume


  • 159

Place Of Publication


  • United States