کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1581358 1514868 2008 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
The alloying mechanisms of Re, Ru in the quaternary Ni-based superalloys γ/γ′γ/γ′ interface: A first principles calculation
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
The alloying mechanisms of Re, Ru in the quaternary Ni-based superalloys γ/γ′γ/γ′ interface: A first principles calculation
چکیده انگلیسی

The site preference of Re, Ru on the γ/γ′γ/γ′ interface and their influence on the partitioning behaviors of W, Mo in the γγ and γ′γ′ phase have been investigated by DMol3 calculation. The transfer energy results show that both Re and Ru exhibit a weak Ni site preference. When Re substitutes Ni on the γ/γ′γ/γ′ interface, it is found a reverse partitioning behavior of W, while the partitioning behavior of Mo was not affected. In contrast, Ru’s substitution for Ni on the interface does not affect the partitioning behaviors of W, Mo, which is in agreement with experimental results. In addition, the different interface strengthening mechanisms for Re and Ru are investigated by the electronic structure analysis of the Mulliken population, the impurity-induced charge redistribution and the partial density of states. Results show that the alloying strengthening effect of Re is mainly due to the direct bonding of Re and the host atoms. Whereas, the addition of Ru is effective for improving the phase stability of Ni-based superalloys.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 490, Issues 1–2, 25 August 2008, Pages 242–249
نویسندگان
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