Effect of nickel segregation on CuΣ9 grain boundary undergone shear deformations

doi:10.1088/1674-1056/27/6/063103

Abstract Impurity segregation at grain boundary (GB) can significantly affect the mechanical behaviors of polycrystalline metal. The effect of nickel impurity segregated at Cu GB on the deformation mechanism relating to loading direction is comprehensively studied by atomic simulation. The atomic structures and shear responses of CuΣ9(114) <110> and Σ9(221) <110> symmetrical tilt grain boundary with different quantities of nickel segregation are analyzed. The results show that multiple accommodative evolutions involving GB gliding, GB shear-coupling migration, and dislocation gliding can be at play, where for the[221] shear of Σ9(114) <110> the segregated GBs tend to maintain their initial configurations and a segregated GB with a higher impurity concentration is more inclined to be a dislocation emission source while maintaining the high mechanical strength undergone plastic deformation for the[114] shear of Σ9(221) <110>. It is found that the nickel segregated GB exerts a cohesion enhancement effect on Cu under deformation:strong nickel segregation increases the work of separation of GB, which is proved by the first-principles calculations.

Keywords: grain boundary segregation nickel impurity first-principles calculations cohesion effect

Received: 14 January 2018
Revised: 05 April 2018
Accepted manuscript online:

PACS:	31.15.xv	(Molecular dynamics and other numerical methods)
	62.20.-x	(Mechanical properties of solids)
	61.72.sd	(Impurity concentration)
	74.62.Dh	(Effects of crystal defects, doping and substitution)

Fund: Project supported by the National Key Research and Development Program of China (Grant No.2017YFA0303600) and the National Natural Science Foundation of China (Grant Nos.11474207 and 11374217).

Corresponding Authors: Hong Zhang
E-mail: hongzhang@scu.edu.cn

Cite this article:

Xiang-Yue Liu(刘湘月), Hong Zhang(张红), Xin-Lu Cheng(程新路) Effect of nickel segregation on CuΣ9 grain boundary undergone shear deformations 2018 Chin. Phys. B 27 063103

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Effect of nickel segregation on CuΣ9 grain boundary undergone shear deformations

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