Structural transformation and energy analysis for pile-up dislocations at triple junction of grain boundary

Ying-jun, Gao; Huang, Zong-Ji; Deng, Qianqian; Kun, Liao; LI, Yi-xuan; Yi, Xiao-Ai; Luo, Zhaohui

doi:10.1016/s1003-6326(21)65777-1

Cited by 6 publications

(4 citation statements)

References 29 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Numerous strategies have been proposed to enhance the mechanical properties of materials, among which grain refinement is one of the most effective approaches. According to the well-known Hall–Petch (HP) relation [ 1 , 2 ], the strength of a polycrystalline material increases as grain size ( d ) decreases, primarily due to the grain boundaries (GBs) hindering dislocation motion [ 3 , 4 , 5 , 6 , 7 , 8 ]. However, as d is decreased to a few or tens of nanometers, the HP relation becomes invalid [ 9 ].…”

Section: Introductionmentioning

confidence: 99%

Theoretical Prediction of Strengthening in Nanocrystalline Cu with Multi-Element Grain Boundary Segregation Decoration

Guo,

Li,

et al. 2024

Materials

View full text Add to dashboard Cite

The composition of grain boundaries (GBs) determines their mechanical behavior, which in turn affects the mechanical properties of nanocrystalline materials. Inspired by GB segregation and the concept of high-entropy alloys (HEAs), we investigated, respectively, the mechanical responses of nanocrystalline Cu samples with and without multi-element GBs, as well as the grain size effects, aiming to explore the effects of GB composition decoration on mechanical properties. Our results show that introducing multi-element segregation GBs can significantly improve the mechanical properties of nanocrystalline Cu by effectively inhibiting GB migration and sliding. Additionally, we proposed an improved a theoretical model that can reasonably describe the strengths of the materials with multi-element or single-element segregation GBs. Notably, the introduction of multi-element segregation GBs inhibits both migration and sliding behavior, with migration being more effectively suppressed than sliding. These results present a novel approach for designing high-performance nanometallic materials and offer valuable insights into the role of GB composition decoration in enhancing mechanical properties.

show abstract

Section: Introductionmentioning

confidence: 99%

Theoretical Prediction of Strengthening in Nanocrystalline Cu with Multi-Element Grain Boundary Segregation Decoration

Guo,

Li,

et al. 2024

Materials

View full text Add to dashboard Cite

show abstract

“…There have been several reports [51,62,63,81,82,[87][88][89][90] on the calculation of the stress and strain fields of the defect of the atom lattices given by PFC model. Stenfanovic et al [91] obtains the average strain of the deformation lattice from PFC simulation in real space by calculating the displacement of the position of the lattice atoms caused by the applied stress and gets the atomic position by identifying the maximum position of the locating atomic density peak in the atom lattice.…”

Section: Introductionmentioning

confidence: 99%

“…There have been several reports [ 51,62,63,81,82,87–90 ] on the calculation of the stress and strain fields of the defect of the atom lattices given by PFC model. Stenfanovic et al.…”

Section: Introductionmentioning

confidence: 99%

Center Atom Model for Strain Mapping of Void and Crack of Atomic Lattice Image

Ying-jun

Kun

et al. 2022

Cryst. Res. Technol.

Self Cite

View full text Add to dashboard Cite

Aiming at the strain distribution around the atomic lattice defect with void and crack in crystal materials, a new elastic strain calculation method named as center atom model (CAM) is proposed in this work, and is applied for mapping the strain field of the defect with void in an atomic image lattice in real space under external forcing. As an example, the strain mapping of voids and cracks of an atomic lattice image from phase field crystal (PFC) model is quantitatively characterized by CAM. The results show that CAM can well be used to extract the strain information from various types of the defect surface of atomic lattice images. Wherever the strain distribution around the dislocation of the grain boundary or the strain around the void and crack is, CAM can accurately extract the strain distribution of the distortion area of the atomic lattice. CAM can also be easily extended and applied to the strain mapping of the defects in the heterogeneous interface.

show abstract

“…The newly proposed phase field crystal model (PFC) [22,23] can well be used to simulate the transformation and evolution of the microstructure of materials on the diffusion time scale (10 −6 s), and is very suitable for studying the details and the mechanism of the atomic diffusion process of crack healing on nano-scale. At present, the PFC model has been widely used and developed [24][25][26][27][28][29], especially in the study of crack propagation and bifurcation [30][31][32][33][34]. However, there is no report on the application of PFC method in crack healing.…”

Section: Introductionmentioning

confidence: 99%

Phase field crystal simulation of gap healing at nanoscale

Li¹,

Ying-jun²,

Yi³

et al. 2022

Modelling Simul. Mater. Sci. Eng.

Self Cite

View full text Add to dashboard Cite

The phase field crystal method is used to simulate the healing process of the central gap of 3-dimensional BCC crystal material under compression strain at the atomic level. It is found that during the healing process of the central gap, the gap protrudes at both ends of it, leading to dislocation nucleation and vacancy formation. Then, by means of dislocation nucleation and dislocation emission mechanism at both ends of the gap, the thickness of the gap is reduced by one layer of atoms, and the atomic layer on the gap surface shrinks towards each other. Through the mechanism of dislocation nucleation and dislocation emission, the thickness of gap is reduced layer by layer, and finally the connection and closure of the lattice atoms on up and down surface of the gap is achieved, and the surface healing of the central gap is realized. According to the sharpening and passivation mechanism of the lattice atomic planes at both ends of the gap, the elliptic shape gap is approximated to calculate and analyze the influence of the change of stress intensity factor during the gap healing, and the critical condition of the gap dislocation emission is determined.

show abstract

Structural transformation and energy analysis for pile-up dislocations at triple junction of grain boundary

Cited by 6 publications

References 29 publications

Theoretical Prediction of Strengthening in Nanocrystalline Cu with Multi-Element Grain Boundary Segregation Decoration

Theoretical Prediction of Strengthening in Nanocrystalline Cu with Multi-Element Grain Boundary Segregation Decoration

Center Atom Model for Strain Mapping of Void and Crack of Atomic Lattice Image

Phase field crystal simulation of gap healing at nanoscale

Contact Info

Product

Resources

About