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- W1480491895 abstract "Abstract Self-diffusion studies of Ti and Cr were carried out in a two-phase ceramic compound with nominal composition (Ti 0.3 W 0.5 Cr 0.2 )B 2 , which is a model system for the development of in situ reinforced boride ceramics, via precipitation of a supersaturated host matrix. In the temperature interval 1000 °C⩽ T ⩽1400 °C, the diffusivities were determined with secondary ion mass spectrometry (SIMS) using co-implanted and simultaneously diffusing stable 49 Ti and 54 Cr isotopes. This procedure minimizes systematic errors, reduces experimental time, and enables a direct comparison of the results. The two- phase nature of the material is directly reflected in non-uniform Cr depth profiles, while for Ti, uniform depth profiles indicate nearly the same diffusivities in both phases. The diffusivities of both elements obey an Arrhenius behaviour with activation enthalpies of Δ H Ti =3.1 eV and Δ H Cr =3.3 eV, respectively, and very low pre-exponential factors of about D 0 Ti =1×10 −9 m 2 /s and D 0 Cr =6×10 −8 m 2 /s, which is a hint that no simple vacancy mechanism is operating in the material. The experimental results also suggest that the growth of the precipitates at 1600 °C is controlled by the volume diffusion of Cr and Ti." @default.
- W1480491895 created "2016-06-24" @default.
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- W1480491895 date "2003-06-03" @default.
- W1480491895 modified "2023-09-27" @default.
- W1480491895 title "Material Transport in (Ti0.3W0.5Cr0.2)B2 Ceramics: Simultaneous Diffusion of Ion Implanted49Ti and54Cr." @default.
- W1480491895 cites W2949136212 @default.
- W1480491895 doi "https://doi.org/10.1002/chin.200322010" @default.
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