کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
10142195 1646091 2019 26 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Coarsening behavior of γ′ precipitates in the γ'+γ area of a Ni3Al-based alloy
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
Coarsening behavior of γ′ precipitates in the γ'+γ area of a Ni3Al-based alloy
چکیده انگلیسی
The morphological evolution and coarsening kinetics of γ′ precipitates in the γ'+γ area of a Ni3Al-based alloy during isothermal aging at temperature range of 800 °C to 1000 °C have been investigated. For the aging temperature above 900 °C, the average size of γ′ precipitates increases and the morphology of γ′ precipitates gradually changes from cuboidal to strip-like and L-shaped with increasing aging time up to 50 h. The temporal evolution of the average size of γ′ precipitates is evaluated by the experimentally measured data and it suggests that the cube rate law fits better for experimental data at the early stage coarsening, while the square rate law fits better for the later stage coarsening. Moreover, using these determined values of coarsening rate constants which determined by using a coarsening rate equation based on the LSEM model, the activation energy of the early stage and later stage coarsening have been calculated as 174.2 kJ/mol and 186.3 kJ/mol, respectively.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Alloys and Compounds - Volume 771, 15 January 2019, Pages 526-533
نویسندگان
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