کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10620838 | 988703 | 2007 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Coarsening of γ (Ni-Al solid solution) precipitates in a γⲠ(Ni3Al) matrix
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
The coarsening behavior of Ni-Al solid-solution precipitates in an Ni3Al matrix was investigated in alloys containing 22.0-22.8 at.% Al aged at 650-800 °C for times exceeding 1800 h. The rate constant for coarsening increases with equilibrium volume fraction as predicted by the MLSW theory. The activation energy for coarsening, 314.1 ± 16.6 kJ molâ1, agrees very well with results from conventional diffusion experiments. The particle size distributions are not in very good agreement with the predictions of any theory; possible reasons are discussed. The particles become more spherical with decreasing elastic self-energy. The results are consistent with the premise that a strong volume fraction effect is observed so long as diffusion in the matrix phase, and not through the precipitate-matrix interface, controls the kinetics.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 55, Issue 13, August 2007, Pages 4419-4427
Journal: Acta Materialia - Volume 55, Issue 13, August 2007, Pages 4419-4427
نویسندگان
Yong Ma, Alan J. Ardell,