In order to study the contribution of Mn atoms in Cu precipitates to hardening in bcc Fe matrix, the interactions of a (111){110} edge dislocations with nanosized Cu and Cu-Mn precipitates in bcc Fe have been investigated by using of molecular dynamics. The results indicate that the critical resolved shear stresses (τc) of the Cu-Mn precipitates are larger than that of Cu precipitates. Meanwhile, τc of the Cu-Mn precipitates show a much more significant dependence on temperature and size, compared to Cu precipitates. Mn atoms exhibit strong attractive interaction with <111> crowdion and improve the fraction of transformed atoms from body centred cubic (bcc) phase to face centred cubic (fcc) phase for big size precipitates. Those all lead to the higher resistance to the dislocation glide. The increasing temperature can assist the Cu atoms rearrange back towards a bcc structure, resulting in the rapid decline of τc. Similar to Cu precipitate, Cu-Mn precipitate with equator planes on the dislocation glide plane is proved to be the strongest obstacle. Eventually, these features are confirmed that the appearance of Mn atoms in Cu precipitates greatly facilitates the hardening in bcc Fe matrix.
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2017 25th International Conference on Nuclear Engineering
July 2–6, 2017
Shanghai, China
Conference Sponsors:
- Nuclear Engineering Division
ISBN:
978-0-7918-5780-9
PROCEEDINGS PAPER
The Study of Nanosized Cu-Mn Precipitates Contribution to Hardening in Bcc Fe Matrix
YanKun Dou,
YanKun Dou
China Institute of Atomic Energy, Beijing, China
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XinFu He,
XinFu He
China Institute of Atomic Energy, Beijing, China
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DongJie Wang,
DongJie Wang
China Institute of Atomic Energy, Beijing, China
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Wu Shi,
Wu Shi
China Institute of Atomic Energy, Beijing, China
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LiXia Jia,
LiXia Jia
China Institute of Atomic Energy, Beijing, China
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Wen Yang
Wen Yang
China Institute of Atomic Energy, Beijing, China
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YanKun Dou
China Institute of Atomic Energy, Beijing, China
XinFu He
China Institute of Atomic Energy, Beijing, China
DongJie Wang
China Institute of Atomic Energy, Beijing, China
Wu Shi
China Institute of Atomic Energy, Beijing, China
LiXia Jia
China Institute of Atomic Energy, Beijing, China
Wen Yang
China Institute of Atomic Energy, Beijing, China
Paper No:
ICONE25-66505, V002T03A051; 8 pages
Published Online:
October 17, 2017
Citation
Dou, Y, He, X, Wang, D, Shi, W, Jia, L, & Yang, W. "The Study of Nanosized Cu-Mn Precipitates Contribution to Hardening in Bcc Fe Matrix." Proceedings of the 2017 25th International Conference on Nuclear Engineering. Volume 2: Plant Systems, Structures, Components and Materials. Shanghai, China. July 2–6, 2017. V002T03A051. ASME. https://doi.org/10.1115/ICONE25-66505
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