Deformation Twinning in Octahedron-Based Face-Centered Cubic Metallic Structures: Localized Shear-Force Dipoles Drive Atomic Displacements

2021 ◽  
Author(s):  
Hengfei Gu ◽  
Chengze Liu ◽  
Fusen Yuan ◽  
Fuzhou Han ◽  
Yingdong Zhang ◽  
...  
Keyword(s):  
Shear Force ◽  
Deformation Twinning ◽  
Face Centered Cubic ◽  
Metallic Structures ◽  
Atomic Displacements ◽  
Face Centered

Deformation Twinning and Detwinning in Face‐Centered Cubic Metallic Materials

2019 ◽  
Vol 22 (1) ◽  
pp. 1900479
Author(s):  
Xinglong An ◽  
Song Ni ◽  
Min Song ◽  
Xiaozhou Liao
Keyword(s):  
Deformation Twinning ◽  
Face Centered Cubic ◽  
Metallic Materials ◽  
Face Centered

INTERATOMIC CORRELATION MOMENTS AND MEAN SQUARE RELATIVE DISPLACEMENTS IN AN ANHARMONIC CRYSTAL WITH THE FACE-CENTERED CUBIC LATTICE

1996 ◽  
Vol 10 (21) ◽  
pp. 1043-1051 ◽  
Author(s):  
V.I. ZUBOV ◽  
M.F. PASCUAL ◽  
C.G. RODRIGUES
Keyword(s):  
Face Centered Cubic ◽  
Mean Square ◽  
Anharmonic Crystal ◽  
Cubic Lattice ◽  
Atomic Displacements ◽  
Consistent Field ◽  
Self Consistent Field ◽  
The Face ◽  
Face Centered ◽  
Anharmonic Crystals

Using the correlative method of unsymmetrized self-consistent field we study the dynamical properties of anharmonic crystals, namely, the quadratic correlations between atomic displacements from the equilibrium positions and their mean square relative displacements in anharmonic crystals. In the present paper we calculate these values for a weakly anharmonic crystals with the face-centered cubic lattice in which the nearest neighbors interact. The second order of the method enables one to calculate for this lattice the correlations between the nearest, second, third and fourth neighbors. The results are compared with those obtained previously for simplified models. The dependence on the coordination number and on the dimensionality of the lattice is discussed.

Deformation Twinning of Molecular Dynamics Simulation in a Ternary Titanium Alloy under Nanoindentation

2016 ◽  
Vol 874 ◽  
pp. 328-332
Author(s):  
Si Ling Huang ◽  
Zhen Yu Zhang ◽  
Jun Feng Cui ◽  
Song Yang ◽  
Xiao Guang Guo
Keyword(s):  
Molecular Dynamics ◽  
Single Crystal ◽  
Md Simulations ◽  
Deformation Twinning ◽  
Dynamics Simulation ◽  
Single Element ◽  
Face Centered Cubic ◽  
Ti Alloy ◽  
Large Area ◽  
Face Centered

Nanotwinned (nt) metals exhibit excellent mechanical, electrical and thermal properties, and therefore attract much attentions. To fabricate large area nt surface, the fundamental mechanisms of deformation twinning induced by molecular dynamics (MD) are necessary to be explored. Nevertheless, MD of nt metals currently focus mainly on nt copper (Cu) and other single element metals with face-centered cubic (fcc) structure. In addition, MD simulations are usually performed on a built nt model, rather than from a single crystal, due to the difficulty of forming nanotwins. In this study, a single crystal is constructed in a ternary titanium (Ti) alloy with hexagonal closed-packed (hcp) lattice cell. Deformation twinning of MD simulation is performed in a ternary Ti alloy under nanoindentation from the built single crystal. Zonal structure is found during loading under nanoindentation, and nanograins transforms into nanotwins. Deformation twinning is significant to understanding the formation of nanotwins, as well as fabricating large area nt surface on a Ti alloy.

Deformation Mechanisms of Nanocrystalline Hexagonal Close-Packed Metals

2006 ◽  
Vol 924 ◽  
Author(s):  
Guangping Zheng
Keyword(s):  
Deformation Twinning ◽  
Dynamics Simulation ◽  
Deformation Mechanisms ◽  
Face Centered Cubic ◽  
Transformation Mechanism ◽  
Shockley Partial Dislocation ◽  
Hexagonal Close Packed ◽  
Simulation Results ◽  
Face Centered ◽  
Fcc Structure

ABSTRACTUsing molecular dynamics simulation of nanocrystalline (nc) samples with grain size of 10 nm, a reverse martensitic transformation from hexagonal close-packed (hcp) to face-centered cubic (fcc) structure is observed in nc-cobalt and nc-zirconium undergoing plastic deformation. In nc-cobalt hcp-to-fcc transformation is prevalent and deformation twinning is rarely observed. The transformation mechanism involves the motion of Shockley partial dislocation 1/3<1100> in every other (0001)hcp /(111)fcc plane. In nc-zirconium the hcp-to-fcc transformation competes with the deformation twinning. From the simulation results, it is suggested that the interaction among partials should be considered to understand the deformation mechanisms of hcp nc metals.

scholarly journals Deformation twinning evolution from a single crystal in a face-centered-cubic ternary alloy

2015 ◽  
Vol 5 (1) ◽  
Author(s):  
Zhenyu Zhang ◽  
Song Yang ◽  
Dongming Guo ◽  
Boya Yuan ◽  
Xiaoguang Guo ◽  
...  
Keyword(s):  
Single Crystal ◽  
Ternary Alloy ◽  
Deformation Twinning ◽  
Face Centered Cubic ◽  
Face Centered
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