کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7921846 | 1511753 | 2018 | 36 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Temperature effects on the serrated behavior of an Al0.5CoCrCuFeNi high-entropy alloy
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
مواد الکترونیکی، نوری و مغناطیسی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Compression experiments of the Al0.5CoCrCuFeNi high-entropy alloy (HEA) under displacement control were conducted at different temperatures ranging from 673Â K to 873Â K with a strain rate of 5Â ÃÂ 10â5/s to study its serration behavior. Samples after compression tests were investigated, using the synchrontron-diffraction technique and transmission-electron microscopy. By comparing the stress-strain curves at different temperatures, two opposite directions of serrations were observed, named the upward serration appearing at 573Â K and 673Â K and the downward serration at 773Â K and 873Â K. The different directions of serrations were discussed in terms of not only the relationships among the stress vs. strain, stress vs. time, and strain vs. time, but also the interactions among dislocations, atoms, and nanoparticles. Finally, the temperature effect on the flow serration is discussed by referring to a theoretical framework for the initiation of the serrated flow. Beyond a critical high temperature, the initiation of the serrated flow becomes swiftly difficult, and ultimately the plastic flow in the full deformation range turns smooth. The theoretical prediction of the normal behavior is essentially in qualitative agreement with the experimental observation in the present work, i.e., the critical strain to initiate the serration decreases with increasing the temperature.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Chemistry and Physics - Volume 210, 1 May 2018, Pages 20-28
Journal: Materials Chemistry and Physics - Volume 210, 1 May 2018, Pages 20-28
نویسندگان
Shuying Chen, Xie Xie, Weidong Li, Rui Feng, Bilin Chen, Junwei Qiao, Yang Ren, Yong Zhang, Karin A. Dahmen, Peter K. Liaw,