Dissociation of Tilt Dislocation Walls in Au

doi:10.1007/s40195-022-01409-3

Abstract

Abstract:

The movement or dissociation of dislocations is significantly important for better understanding the plastic deformation mechanisms and mechanical properties of metals. It is commonly believed that a dislocation < 110 > /2 in Au is easy to dissociate into a pair of Shockley partial dislocations < 112 > /6 due to low stacking fault energy (SFE). Contrary to this prevailing perception, the present atomistic modeling demonstrates that this reaction could be completely suppressed when dislocations < 110 > /2 are grouped into tilt walls, consistent with our experimental observations. Such phenomenon is actually the extreme case accompanying with the variation of Burgers vectors of partials with tilt angle, as revealed by a series of simulations, from which it is clearly seen that the Burgers vectors of partials deviate considerably from that of Shockley partials, enormously depending on the tilt angle. Our findings could facilitate a better understanding on many phenomena and properties of face-centered cubic metals (FCC).

Key words: Dislocation, Tilt wall, Stacking fault, Dissociation, Grain boundary

Yu-Juan Geng, Chun-Yang Wang, Jing-Xin Yan, Zhen-Jun Zhang, Hua-Jie Yang, Jin-Bo Yang, Kui Du, Zhe-Feng Zhang. Dissociation of Tilt Dislocation Walls in Au[J]. Acta Metallurgica Sinica (English Letters), 2022, 35(11): 1787-1792.

Figures/Tables 4

Fig. 1 Simulated two tilt boundaries in Au with the tilt angles θ of a 3.118° and b 11.655°. c Variation of the stacking fault width with θ at 0 K and 300 K. In a and b, the red atoms are revealed by excess energy of atoms, indicating the location of dislocation cores. In a, the green atoms are located on stacking faults, selected by their coordination number. The partial dislocations in b are denoted by the Shockley dislocations Bδ and δC (for convenience since they are not their precise values). See text for parameters

Fig. 2 HRTEM images of two tilt grain boundaries in Au with the tilt angles θ of a 2.76° and b 11.85°. In a and b, stacking faults are indicated by arrows. The symbols in b denote perfect dislocations $[10\overline{1}]/2.$

Fig. 3 a γ-surface on (111) plane in Au. b Disregistries Δux and Δuz along z. In a, b = BC = $[10\overline{1}]/2.$ and M is the middle point of BC. The ordinary dissociation with rational Burgers vectors is BC = Bδ + δC with a stable stacking fault (its energy γI), while the actual reaction is BC = BT + TC with a transitional planar fault (its energyγT). See text for parameters

Fig. 4 Variation of the parameter x with the tilt angle θ based on simulation data

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