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research-article

The Study of Nanosized Cu-Mn Precipitates Contribution to Hardening in Bcc Fe Matrix

[+] Author and Article Information
Yankun Dou

China institute of Atomic Energy, 102413, Fangshan district, Beijing, China
douyankun3@163.com

xinfu He

China institute of Atomic Energy, 102413, Fangshan district, Beijing, China
hexinfu@ciae.ac.cn

Dongjie Wang

China institute of Atomic Energy, 102413, Fangshan district, Beijing, China
w1992dongjie@163.com

Wu Shi

China institute of Atomic Energy, 102413, Fangshan district, Beijing, China
wushi46@qq.com

Lixia Jia

China institute of Atomic Energy, 102413, Fangshan district, Beijing, China
lxjia@ciae.ac.cn

Wen Yang

China institute of Atomic Energy, 102413, Fangshan district, Beijing, China
yangwen@ciae.ac.cn

1Corresponding author.

ASME doi:10.1115/1.4039969 History: Received October 26, 2017; Revised April 05, 2018

Abstract

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 of the Cu-Mn precipitates are larger than that of Cu precipitates. Meanwhile, the critical resolved shear stresses 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 centered cubic (bcc) phase to face centered 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 the critical resolved shear stresses. Eventually, these features are confirmed that the appearance of Mn atoms in Cu precipitates greatly facilitates the hardening in bcc Fe matrix.

Copyright (c) 2018 by ASME
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