کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
9796581 1514949 2005 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Deformation behavior of a modified 5083 aluminum alloy
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
Deformation behavior of a modified 5083 aluminum alloy
چکیده انگلیسی
The deformation behavior of a 0.2% Zr and 1.6% Mn modified 5083 aluminum alloy was studied in the temperature range of 250-570 °C over seven orders of magnitude of strain rates. It was shown that the modified 5083 alloy exhibits threshold behavior in the temperature interval of 250-500 °C. There exists a temperature dependence of threshold stress with the energy term Qo = 18 kJ/mol. It was shown by transmission election microscopy that detachment of dislocations from dispersoids under extra force takes place. Threshold stress tends to disappear with increasing temperature at T > 500 °C despite the fact that evidence for interactions between mobile dislocations and dispersoids was found at these temperatures. Analysis of creep data in terms of threshold stress revealed three different types of deformation behavior. At high values of normalized strain rate, ε˙kT/(D1Gb)>4×10−8, the exponential law creep takes place. At normalized strain rates, ε˙kT/(D1Gb), ranging from 4 × 10−8 to 4 × 10−14, the n value is ∼4 and the true activation energy, Qc, is equal to 139 ± 12 kJ/mol, suggesting high temperature dislocation climb. At low normalized strain rate, a transition to Newtonian viscous flow occurs.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 392, Issues 1–2, 15 February 2005, Pages 373-379
نویسندگان
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