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Journal of Materials Engineering and Performance

Erschienen in:

01.05.2014

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

verfasst von: B. B. Straumal, A. S. Gornakova, S. I. Prokofjev, N. S. Afonikova, B. Baretzky, A. N. Nekrasov, K. I. Kolesnikova

Erschienen in: Journal of Materials Engineering and Performance | Ausgabe 5/2014

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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.

Vorheriger Artikel Self-Diffusion in Grain Boundaries and Dislocation Pipes in Al, Fe, and Ni and Application to AlN Precipitation in Steel

Nächster Artikel Joining of Cu, Ni, and Ti Using Au-Ge-Based High-Temperature Solder Alloys

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Titel: Continuous and Discontinuous αTi Layers Between Grains of β(Ti,Co) Phase
verfasst von: B. B. Straumal
A. S. Gornakova
S. I. Prokofjev
N. S. Afonikova
B. Baretzky
A. N. Nekrasov
K. I. Kolesnikova
Publikationsdatum: 01.05.2014
Verlag: Springer US
Erschienen in: Journal of Materials Engineering and Performance / Ausgabe 5/2014
Print ISSN: 1059-9495
Elektronische ISSN: 1544-1024
DOI: https://doi.org/10.1007/s11665-013-0789-3

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