کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7974737 | 1514667 | 2016 | 34 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effect of annealing on mechanical properties of a nanocrystalline 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
![عکس صفحه اول مقاله: Effect of annealing on mechanical properties of a nanocrystalline CoCrFeNiMn high-entropy alloy processed by high-pressure torsion Effect of annealing on mechanical properties of a nanocrystalline CoCrFeNiMn high-entropy alloy processed by high-pressure torsion](/preview/png/7974737.png)
چکیده انگلیسی
A CoCrFeNiMn high-entropy alloy (HEA) was processed by high-pressure torsion (HPT) under 6.0Â GPa pressure up to 10 turns at room temperature. It is shown that there is a gradual evolution in hardness with increasing numbers of turns but full homogeneity is not achieved even after 10 turns. Microhardness measurements reveal that the material reaches a saturation hardness value of ~4.41Â GPa and in this condition the microstructure shows exceptional grain refinement with a grain size of ~10Â nm. An ultimate strength value of ~1.75Â GPa and an elongation to fracture of ~4% were obtained in a sample processed for 5 turns. The nanostructured HEA was subjected to post-deformation annealing (PDA) at 473-1173Â K and it is shown that the hardness increases slightly to 773Â K due to precipitation and then decreases up to 1173Â K due to a combination of recrystallization, grain growth and a dissolution of the precipitates. The formation of brittle precipitates, especially Ï-phase, at 873 and 973Â K significantly reduces the ductility. Short-term annealing for 10Â min at 1073Â K prevents grain growth and leads to a combination of high strength and good ductility including an ultimate tensile strength of ~830Â MPa and an elongation to failure of ~65%.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 676, 31 October 2016, Pages 294-303
Journal: Materials Science and Engineering: A - Volume 676, 31 October 2016, Pages 294-303
نویسندگان
Hamed Shahmir, Junyang He, Zhaoping Lu, Megumi Kawasaki, Terence G. Langdon,