کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5456155 1514658 2017 36 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Influence of grain size on the flow properties of an Al-Mg-Sc alloy over seven orders of magnitude of strain rate
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
Influence of grain size on the flow properties of an Al-Mg-Sc alloy over seven orders of magnitude of strain rate
چکیده انگلیسی
Experiments were conducted to evaluate the flow properties of an Al-3Mg-0.2Sc alloy both without and with processing using equal-channel angular pressing (ECAP). The initial grain size was ~300 µm and this was reduced to ~250 nm by ECAP and then increased to ~600 nm by annealing at 673 K for 10 min. Tests were conducted to determine the mechanical properties over seven orders of magnitude of strain rate from ~10−4 to ~103 s−1. The results confirm the validity of the Hall-Petch relationship in the material processed by ECAP. Shear banding occurred in the coarse-grained material during dynamic testing but in the ECAP-processed alloy there was only minor grain coarsening. There was evidence for dynamic strain ageing in both the coarse and the ultrafine-grained (UFG) alloy with a transition in flow mechanism at high temperatures from dislocation climb in the coarse-grained material to superplasticity in the UFG alloy.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 685, 8 February 2017, Pages 367-376
نویسندگان
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