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
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
Evidence for superplasticity in a CoCrFeNiMn high-entropy alloy processed by high-pressure torsion
چکیده انگلیسی
A CoCrFeNiMn high-entropy alloy was processed by high-pressure torsion to produce a grain size of ~10 nm and then tested in tension at elevated temperatures from 773 to 1073 K using strain rates in the range from 1.0×10−3 to 1.0×10−1 s−1. The alloy exhibited excellent ductility at these elevated temperatures including superplastic elongations with a maximum elongation of >600% at a testing temperature of 973 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
نویسندگان
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