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Research Papers

The Study of Nanosized Cu–Mn Precipitates Contribution to Hardening in Body Centered Cubic Fe Matrix

[+] Author and Article Information
YanKun Dou

China Institute of Atomic Energy,
Fangshan District,
Beijing 102413, China
e-mail: douyankun3@163.com

XinFu He

China Institute of Atomic Energy,
Fangshan District,
Beijing 102413, China
e-mail: hexinfu@ciae.ac.cn

DongJie Wang

China Institute of Atomic Energy,
Fangshan District,
Beijing 102413, China
e-mail: w1992dongjie@163.com

Wu Shi

China Institute of Atomic Energy,
Fangshan District,
Beijing 102413, China
e-mail: wushi46@qq.com

LiXia Jia

China Institute of Atomic Energy,
Fangshan District,
Beijing 102413, China
e-mail: lxjia@ciae.ac.cn

Wen Yang

China Institute of Atomic Energy,
Fangshan District,
Beijing 102413, China
e-mail: yangwen@ciae.ac.cn

1Corresponding author.

Manuscript received October 26, 2017; final manuscript received April 5, 2018; published online September 10, 2018. Assoc. Editor: Akos Horvath.

ASME J of Nuclear Rad Sci 4(4), 041007 (Sep 10, 2018) (6 pages) Paper No: NERS-17-1194; doi: 10.1115/1.4039969 History: Received October 26, 2017; Revised April 05, 2018

In order to study the contribution of manganese (Mn) atoms in copper (Cu) precipitates to hardening in body centered cubic (BCC) structure iron (Fe) matrix, the interactions of a 1/2 〈111〉 {110} edge dislocations with nanosized Cu and Cu–Mn precipitates in BCC Fe have been investigated by using molecular dynamics method (MD). 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 attraction to dislocation segment in Cu precipitate and improve the fraction of transformed atoms from BCC phase to nine rhombohedron (R) phase for big size precipitates. Those all lead to the higher resistance to the dislocation glide. Eventually, these features confirmed that the appearance of Mn atoms in Cu precipitates greatly facilitates the hardening in BCC Fe matrix.

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Figures

Grahic Jump Location
Fig. 1

(a) Schematic presentation of simulated crystallite and (b) periodic cell of MD simulation for the interaction of an edge dislocation and precipitate

Grahic Jump Location
Fig. 2

Dependences of stress–strain curves for 2 nm precipitates on temperature for (a) Cu precipitates, (b) Cu–Mn precipitates, and (c) the corresponding critical shear stress; the inset pictures are MD snapshots of the interaction between an edge dislocation and 2 nm Cu precipitate

Grahic Jump Location
Fig. 3

Dependences of stress–strain curves on sizes at 600 K: (a) Cu precipitates, (b) Cu–Mn precipitates, and (c) the corresponding critical shear stress, the inset pictures are the morphology of Cu and Cu–Mn precipitates after the dislocation detachment

Grahic Jump Location
Fig. 4

Critical shear stress of Cu and Cu–Mn precipitates versus temperature

Grahic Jump Location
Fig. 5

Critical shear stress of Cu and Cu–Mn precipitates versus (D−1+L−1)−1

Grahic Jump Location
Fig. 6

Critical line shape for an edge dislocation passing through precipitates: (a) Cu–Mn precipitates with different sizes and (b) Cu and Cu–Mn precipitates with diameter of 4 nm

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