کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1575092 | 1514735 | 2014 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Constitutive equation and hot deformation behavior of homogenized Al-7.68Zn-2.12Mg-1.98Cu-0.12Zr alloy during compression at elevated temperature
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Hot compression tests over the temperature range from 300 °C to 450 °C and strain rates range from 0.01 sâ1 to 10 sâ1 of homogenized Al-7.68Zn-2.12Mg-1.98Cu-0.12Zr alloy were carried out on a Gleeble-3500 thermal simulation machine to characterize its hot deformation behavior. The results showed that the flow stress can be predicted by a two-stage constitutive model based on the dislocation density theory and kinetics of dynamic recrystallization (DRX) with the hot deformation activation energy of 125.4 kJ/mol. The associated microstructure was studied using transmission electron microscopy (TEM) and electron back scattered diffraction (EBSD) technique. With the decrease of ln Z (Z represents the Zener-Hollomon parameter) value from 22.4 to 18.6, the microstructure analysis revealed a decrease of low angle boundaries (misorientation below 15°) from 96.1% to 78.2%, and an increase of the higher angle boundaries with the misorientation angles between 15° and 60° from 3.9% to 21.8%. Combining the results from processing map, it can be concluded that such an evolution is mainly due to the decrease of subgrains with the increase of Z values, and partly due to the partial DRX at low Z values. The softening mechanisms of homogenized Al-7.68Zn-2.12Mg-1.98Cu-0.12Zr alloy is dynamic recovery (DRV), together with a partial DRX at high temperature and low strain rate conditions (low Z value).
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 608, 1 July 2014, Pages 63-72
Journal: Materials Science and Engineering: A - Volume 608, 1 July 2014, Pages 63-72
نویسندگان
D. Feng, X.M. Zhang, S.D. Liu, Y.L. Deng,