کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5456152 | 1514658 | 2017 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Evidence for superplasticity in a CoCrFeNiMn high-entropy alloy processed by high-pressure torsion
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
A CoCrFeNiMn high-entropy alloy was processed by high-pressure torsion to produce a grain size of ~10Â nm and then tested in tension at elevated temperatures from 773 to 1073Â K using strain rates in the range from 1.0Ã10â3 to 1.0Ã10â1 sâ1. The alloy exhibited excellent ductility at these elevated temperatures including superplastic elongations with a maximum elongation of >600% at a testing temperature of 973Â K. It is concluded that the formation of precipitates and the sluggish diffusion in the HEA inhibit grain growth and contribute to a reasonable stability of the fine-grained structure at elevated temperatures. The results show the activation energy for flow matches the anticipated value for grain boundary diffusion in nickel but the strain rate sensitivity is low due to the occurrence of some grain growth at these high testing temperatures.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 685, 8 February 2017, Pages 342-348
Journal: Materials Science and Engineering: A - Volume 685, 8 February 2017, Pages 342-348
نویسندگان
Hamed Shahmir, Junyang He, Zhaoping Lu, Megumi Kawasaki, Terence G. Langdon,