کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1449031 988689 2009 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Nanoquasicrystalline Al–Fe–Cr-based alloys. Part II. Mechanical properties
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
Nanoquasicrystalline Al–Fe–Cr-based alloys. Part II. Mechanical properties
چکیده انگلیسی

Nanoquasicrystalline Al-based alloys show considerable promise for elevated temperature applications compared with commercial Al-based alloys. In particular, a group of Al–Fe–Cr-based alloys-containing Ti, V, Nb or Ta have outstanding thermal stability. In the present work, the elevated temperature mechanical properties of these nanoquasicrystalline alloys were studied by tensile tests at a constant strain rate. Tests were designed in order to compare the mechanical behaviour at different test temperatures. Fractographic analysis was also carried out. The apparent activation energy for plastic deformation was found to be close to that for lattice self-diffusion for pure Al in the Al–Fe–Cr ternary alloy and in the Ti-containing alloy, and for grain boundaries diffusion for pure Al in the V-containing alloy, whereas the activation energy of the alloy with Ta additions was three times higher. All of the alloys showed similar sensitivity of plastic deformation to the strain rate in the range of 10−3–5 × 10−6 s−1 at 350 °C. The apparent true stress exponent was napp ∼ 7, which can be associated with a deformation process controlled by dislocation mechanisms.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Acta Materialia - Volume 57, Issue 17, October 2009, Pages 5120–5130
نویسندگان
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