کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1449030 988689 2009 13 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Nanoquasicrystalline Al–Fe–Cr-based alloys. Part I: Phase transformations
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Nanoquasicrystalline Al–Fe–Cr-based alloys. Part I: Phase transformations
چکیده انگلیسی

Nanoquasicrystalline Al–Fe–Cr-based alloys composed of sub-micro-sized icosahedral quasicrystalline particles embedded in α-Al matrix have a higher strength at elevated temperature compared with commercial Al alloys. However, further improvement of the microstructural stability is desirable in order to maximize the elevated temperature strength. A detailed study of the effect on the microstructure and the phase transformations by the addition of Ti, V, Nb or Ta to a ternary Al93(Fe3Cr2)7 alloy was carried out using heat treatment and microstructural characterization. The addition of the fourth element leads to a refined microstructure and can stabilize the icosahedral topology, delaying the quasicrystalline icosahedral phase decomposition until a higher temperature is reached. The addition of Nb or Ta enabled a greater stabilization effect than the addition of Ti or V, retaining a microstructure similar to the as-spun state after heat treatment between 450 and 550 °C and even retaining icosahedral particles up to 550 °C. The outstanding microstructural stabilization obtained with addition of Nb or Ta leads to very promising applications in the automotive and aeronautic industries.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 57, Issue 17, October 2009, Pages 5107–5119
نویسندگان
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