کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
9795606 | 1514932 | 2005 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Impression creep of a Mg-8Zn-4Al-0.5Ca alloy
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Impression creep of a Mg-8Zn-4Al-0.5Ca alloy Impression creep of a Mg-8Zn-4Al-0.5Ca alloy](/preview/png/9795606.png)
چکیده انگلیسی
The creep behavior of a precipitation hardenable Mg-8Zn-4Al-0.5Ca (wt.%) casting alloy was determined by using impression creep tests in the temperature range of 403-623Â K and under the punching stress range of 1.68-60.4Â MPa. Using a power law between the steady-state impression velocity and the punching stress, it was found that the stress exponent changes with both stress and temperature. The activation energy evaluated at the same punching stress was found to be a function of the punching stress and changed from 76.5Â kJ/mol at 13.4Â MPa to 45.4Â kJ/mol at 46.95Â MPa. However, by using a hyperbolic sine stress law between the steady-state impression velocity and the punching stress, a single activation energy was found to be 77.5Â kJ/mol, which is about half of the activation energy for lattice diffusion in Mg. A single mechanism of grain boundary fluid flow was proposed to be the controlling mechanism for the creep behavior of the Mg-8Zn-4Al-0.5Ca alloy under the testing conditions.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volumes 410â411, 25 November 2005, Pages 42-47
Journal: Materials Science and Engineering: A - Volumes 410â411, 25 November 2005, Pages 42-47
نویسندگان
Lingling Peng, Fuqian Yang, Jian-Feng Nie, J.C.M. Li,