کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5455405 | 1514638 | 2017 | 36 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Microstructure and properties of a CoCrFeNiMn high-entropy alloy processed by equal-channel angular pressing
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: Microstructure and properties of a CoCrFeNiMn high-entropy alloy processed by equal-channel angular pressing Microstructure and properties of a CoCrFeNiMn high-entropy alloy processed by equal-channel angular pressing](/preview/png/5455405.png)
چکیده انگلیسی
A CoCrFeNiMn high-entropy alloy (HEA) was processed by equal-channel angular pressing (ECAP) for up to four passes at 673Â K and the results show that the strength increases gradually with increasing straining up to ~ 1Â GPa with an elongation to failure of ~ 35% after four passes of ECAP. In this condition, the microstructure is a single-phase ultrafine-grained (UFG) CoCrFeNiMn HEA with an average grain size of ~ 100Â nm and a high dislocation density. This UFG HEA was subjected to post-deformation annealing (PDA) at temperatures of 673-1073Â K for 60Â min and it is shown that the hardness increases slightly due to precipitation to 773Â K and then decreases to 1073Â K due to a combination of recrystallization, grain growth and a dissolution of precipitates. The formation of brittle Ï-phase precipitates improves the strength significantly but with a minor decrease in ductility. Annealing at the peak temperature of 773Â K produces a very high yield strength of ~ 1015Â MPa and an ultimate strength of ~ 1080Â MPa together with an excellent elongation to failure of ~ 30%. An analysis of the data shows that grain boundary strengthening is the most important strengthening mechanism in these ECAP samples both before and after PDA.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 705, 29 September 2017, Pages 411-419
Journal: Materials Science and Engineering: A - Volume 705, 29 September 2017, Pages 411-419
نویسندگان
Hamed Shahmir, Tayebeh Mousavi, Junyang He, Zhaoping Lu, Megumi Kawasaki, Terence G. Langdon,