کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1600500 1515889 2012 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effects of annealing treatment on phase composition and microstructure of CoCrFeNiTiAlx high-entropy alloys
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فلزات و آلیاژها
پیش نمایش صفحه اول مقاله
Effects of annealing treatment on phase composition and microstructure of CoCrFeNiTiAlx high-entropy alloys
چکیده انگلیسی

CoCrFeNiTiAlx (x: molar ratio) high-entropy alloys with different Al content were prepared by vacuum arc-melt casting and the as-synthesized alloys were subsequently heat treated at 1000 °C for 2 h. Effects of Al content and annealing treatment on phase composition and microstructure of these alloys were investigated by intensive characterization and analysis of the crystal structure, morphology and elemental segregation. Al addition promotes the formation of BCC structured phases in both as-cast and as-annealed alloys. The alloy without Al addition is mainly composed of face-centered cubic (FCC) solid-solution while the main phase transforms to stabilized (α-Fe,Cr)-based body-centered cubic (BCC) solid-solution as Al is introduced. Annealing demonstrates no obvious influence on the main phase and elemental segregation of CoCrFeNiTiAlx alloys except for alloys with low Al content (x = 0, 0.5 and 1.0) contain more intermetallic compounds after annealing. The phase formation rules of high-entropy alloys is explored in this study as the empirical formation rules of simple solid-solutions are proposed as: mixing entropy (∆Smix) ≥ 13.38 J/K·mol, −10 kJ/mol ≤ mixing enthalpy (∆Hmix) ≤ 5 kJ/mol and atom-size difference (δ) ≤ 4.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Intermetallics - Volume 22, March 2012, Pages 24–32
نویسندگان
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