کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1448349 988671 2008 14 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Assessment of the diffusion mobilites in the γ′ and B2 phases in the Ni–Al–Cr system
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Assessment of the diffusion mobilites in the γ′ and B2 phases in the Ni–Al–Cr system
چکیده انگلیسی

This work presents the assessment of the diffusion mobilities in both the γ′ (Ni3Al-L12) and B2 (NiAl) phases in the Ni–Al–Cr system utilizing the phenomenological model developed by Helander and Ågren. Available experimental tracer diffusivity, interdiffusion coefficients and activation energies were evaluated and then used to optimize the composition- and temperature-dependent diffusion mobilities. For both the B2 and γ′ phases, the assessed diffusion mobility descriptions reproduce the Arrhenius temperature dependence for the Ni, Al and Cr tracer diffusivities and interdiffusion coefficients. The assessment reproduces the strong composition dependence of the diffusivities in the B2 phase observed experimentally. The measured composition dependences of the diffusivities in the γ′ phase are also replicated by the present mobility descriptions. The assessed mobility descriptions are validated by comparing calculated and measured composition profiles for a variety of Ni–Al and Ni–Al–Cr diffusion couples, including B2/B2, γ (fcc)/γ′ and γ/B2 couples.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 56, Issue 16, September 2008, Pages 4277–4290
نویسندگان
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