کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5455687 1514645 2017 21 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Nanoindentation creep behavior of coarse-grained and ultrafine-grained pure magnesium and AZ31 alloy
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
Nanoindentation creep behavior of coarse-grained and ultrafine-grained pure magnesium and AZ31 alloy
چکیده انگلیسی
Ultrafine-grained (UFG) pure magnesium and AZ31 alloy were prepared by sliding friction treatment (SFT). Nanoindentation tests of UFG Mg and AZ31 alloy were performed under a wide range of loading strain rates from 0.004/s to 0.4/s with a holding time of 500 s at room temperature to study the grain size and alloy element influence on the creep behavior and the corresponding deformation mechanisms. It is shown that the refined grain size could promote creep behavior, while the alloy elements would enhance the creep resistance. Creep stress exponent deduced in the ending of the holding regime were used to illustrate the creep diversity in these materials. The UFG samples exhibit a reduced creep stress exponent because of significantly increased grain boundary activities. Besides that, the solute atoms of Al and Zn endow the material with an improved creep resistance by limiting interactions between dislocations and boundaries.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 698, 20 June 2017, Pages 348-355
نویسندگان
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