کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1446842 988626 2012 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effects of alloying elements on thermal expansions of γ-Ni and γ′-Ni3Al by first-principles calculations
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Effects of alloying elements on thermal expansions of γ-Ni and γ′-Ni3Al by first-principles calculations
چکیده انگلیسی

The effects of alloying elements (Al, Cr, Hf, Pt, Y, and Zr) on the coefficients of thermal expansion (CTE) of face-centered-cubic Ni (γ) and L12-Ni3Al (γ′) phases have been investigated in terms of the first-principles quasi-harmonic approach by considering both the vibrational and thermal electronic contributions. By combining the present CTE data and the compositions and phase fractions of γ and γ′, the CTE for some Ni–Al-base alloys are predicted and compared with available experimental measurements in the literature, showing good agreement. It is observed that the addition of Pt is effective in reducing the CTE of both γ and γ′ phases, resulting in lower expansion mismatch between the bond coat and the thermally grown oxide alumina layer, as shown by the predicted CTE of Ni–22 Al–x Pt (at.%) alloys (x = 5, 10, 15, 20, 25, 30).

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 60, Issue 4, February 2012, Pages 1846–1856
نویسندگان
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