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Continuous and Discontinuous αTi Layers Between Grains of β(Ti,Co) Phase

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Abstract

The microstructure of Ti-Co polycrystals with 1.6 and 3.2 at.% Co has been studied between 690 and 810 °C after long anneals (720-860 h) in the αTi+β(Ti,Co) two-phase area of the Ti-Co phase diagram. It has been observed that depending on the annealing temperature and GB energy, the αTi phase forms either chains of separated lens-like precipitates or continuous uniform layers along β(Ti,Co)/β(Ti,Co) GBs. In other words, β(Ti,Co)/β(Ti,Co)GBs completely or partially wetted by the αTi phase were observed. At 690 °C, slightly above eutectoid temperature T et = 685 °C, the portion of the completely wetted β(Ti,Co)/β(Ti,Co) GBs is 25% for the Ti-1.6 at.% Co alloy and 60% for the Ti-3.2 at.% Co alloy. It increases with increasing temperature and reaches the maximum of 80% for the Ti-1.6 at.% Co alloy at 780 °C and of 75% for the Ti-3.2 at.% Co alloy at 750 °C. At 810 °C, i.e., close to the upper border of the αTi + β(Ti,Co) two-phase area of the Ti-Co phase diagram, the portion of the completely wetted β(Ti,Co)/β(Ti,Co) GBs drops down to 40% for the Ti-1.6 at.% Co alloy and 20% for the Ti-3.2 at.% Co alloy. Thus, it has been observed for the first time, that the portion of grain boundaries completely wetted by the layers of a second solid phase can non-monotonously depend on the temperature.

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Acknowledgments

The work was partially supported by the Russian Foundation for Basic Research (Grants 12-03-00894 and 13-08-90422) and by the Russian Federal Ministry for Education and Science (Grant 14.A12.31.0001).

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Authors and Affiliations

  1. Institute of Solid State Physics, Russian Academy of Sciences, Ac. Ossipyan str. 2, 142432, Chernogolovka, Russia

    B. B. Straumal, A. S. Gornakova, S. I. Prokofjev, N. S. Afonikova & K. I. Kolesnikova

  2. Laboratory of Hybrid Nanostructured Materials, National University of Science and Technology «MISIS», Leninskii prosp. 4, 119049, Moscow, Russia

    B. B. Straumal

  3. Karlsruher Institut für Technologie, Institut für Nanotechnologie, Hermann-von-Helmholtz-Platz 1, 76344, Eggenstein-Leopoldshafen, Germany

    B. B. Straumal & B. Baretzky

  4. Institute of Experimental Mineralogy, Russian Academy of Sciences, Ac. Ossipyan str. 4, 142432, Chernogolovka, Russia

    A. N. Nekrasov

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  1. B. B. Straumal
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Correspondence to B. B. Straumal.

Additional information

This article is an invited submission to JMEP selected from presentations at the Symposia “Wetting,” “Interface Design,” “Joining Technologies’’ belonging to the Topic “Joining Interface Design” at the European Congress and Exhibition on Advanced Materials Processes (EUROMAT 2013) held September 8-13 2013 in Sevilla Spain has been expanded from the original presentation.

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Straumal, B.B., Gornakova, A.S., Prokofjev, S.I. et al. Continuous and Discontinuous αTi Layers Between Grains of β(Ti,Co) Phase. J. of Materi Eng and Perform 23, 1580–1584 (2014). https://doi.org/10.1007/s11665-013-0789-3

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