Molecular dynamics study of tension-compression asymmetry of nanocrystal α -Ti with stacking fault

An, M.R.; Deng, Qiong; Li, Yu Long; Song, H.Y.; Su, Mengjia; Cai, Jun

doi:10.1016/j.matdes.2017.04.076

Cited by 35 publications

(15 citation statements)

References 56 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Shao et al investigated the relaxation mechanisms of interfaces and the evolution of interfacial dislocation networks in the Cu/Ni multilayered films by MD simulations [ 14 – 17 ]. These works' loading direction is often perpendicular to the interface, referred to as out-of-plane [ 7 , 18 , 19 ]. However, the interface may play different roles during loading along different directions due to the anisotropy of the mechanical properties of crystals [ 20 – 23 ].…”

Section: Introductionmentioning

confidence: 99%

“…Zhou et al proposed a strengthening mechanism governed by multiple necklace-like extended jogged dislocations in a columnar-grained nano-twinned metal subjected to external stress paralleled to the twin planes [ 20 ], which is also observed in Cu/Ni multilayer [ 21 ]. These jogged dislocations are rarely found in a simulation under an out-of-plane loading [ 7 , 18 , 19 , 24 ]. In available MD simulations of in-plane tensions, the sample is usually stretched along a specific direction, i.e., 〈112〉 or 〈110〉 direction [ 25 ].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effects of Anisotropy and In-Plane Grain Boundary in Cu/Pd Multilayered Films with Cube-on-Cube and Twinned Interface

et al. 2021

View full text Add to dashboard Cite

In crystalline materials, grain boundary and anisotropy of crystal structure affect their mechanical properties. The effects of interfacial structure on the mechanical properties may be diverse when the multilayer film is loaded along different directions. In this work, we performed a series of molecular dynamics simulations of the tension of in-plane single and polycrystalline Cu/Pd multilayered films with cube-on-cube (COC) and twinned interfaces to explore the effects of the interfacial structure, loading direction and in-plane grain boundaries on their mechanical properties. The interfacial misfit dislocation lines become bent after relaxation, and the high temperature of 300 K was found as a necessary condition. When stretched along 〈110〉 direction, the strengthening effect of the COC interface is more noticeable; however, when stretched along 〈112〉 direction, the twin interface's strengthening effect is more visible, showing the anisotropic effect of interfacial structure on mechanical properties. However, in the in-plane honeycomb polycrystalline sample, the twin interface showed a pronounced strengthening effect, and no jogged dislocations were observed.

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of Anisotropy and In-Plane Grain Boundary in Cu/Pd Multilayered Films with Cube-on-Cube and Twinned Interface

et al. 2021

View full text Add to dashboard Cite

show abstract

“…There have been numerous researches on the effect of crystal orientation on plastic deformation of HCP materials, and have obtained fruitful theoretical results in recent years. Researches on the plastic behaviors of HCP metallic materials are mainly focused on several common materials such as Mg, [13,14] Ti, [15][16][17][18][19][20][21] and Zr. [22] Ni et al [13] simulated the tensile properties of HCP-Mg nanowire in ⟨1120⟩ orientation and discovered primary and sequential secondary twinning dominated the plastic behavior, which finally resulted in ultrahigh 60% elongation.…”

Section: Introductionmentioning

confidence: 99%

“…For the case of tension loading applied along c axis, Ren et al [15] reported that the {10 12}⟨10 11⟩ twin is observed when tension loading is applied along [0001] direction, and the phase transformation from HCP to FCC has also been another new deformation mechanism during the tension process. An et al [16] further found that the formation of basal/prismatic interface and the motion of SFs in "twin" grains dominate the deformation mechanism in [0001] tension. As for the compression loading applied along c axis, both plastic behaviors in simulations and experiments exhibit different deformation patterns compared to the condition of tension loading.…”

Section: Introductionmentioning

confidence: 99%

“…In simulation, Ren and his coworkers further confirmed the deformation mechanism in all [0001]-oriented nanopillars is dominated by the pyramidal ⟨c+a⟩ slip. [18] While An et al [16] found something new during the compression loading imposed along [0001] direction of Ti nanoplate with internal stacking faults (SFs). And FCC band emerges during the compression and the blockage of SF boundary to the FCC-Ti phase boundary in compression is the main deformation mechanism in this condition.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Anisotropic plasticity of nanocrystalline Ti: A molecular dynamics simulation*

Deng

et al. 2020

Chinese Phys. B

Self Cite

View full text Add to dashboard Cite

Using molecular dynamics simulations, the plastic deformation behavior of nanocrytalline Ti has been investigated under tension and compression normal to the {0001}, { 1 ¯ 010 } , and { 1 ¯ 2 1 ¯ 0 } planes. The results indicate that the plastic deformation strongly depends on crystal orientation and loading directions. Under tension normal to basal plane, the deformation mechanism is mainly the grain reorientation and the subsequent deformation twinning. Under compression, the transformation of hexagonal-close packed (HCP)-Ti to face-centered cubic (FCC)-Ti dominates the deformation. When loading is normal to the prismatic planes (both { 1 ¯ 010 } and { 1 ¯ 2 1 ¯ 0 } ), the deformation mechanism is primarily the phase transformation among HCP, body-centered cubic (BCC), and FCC structures, regardless of loading mode. The orientation relations (OR) of {0001}HCP║{111}FCC and 〈 1 ¯ 210 〉 HCP | | 〈 110 〉 FCC , and { 10 1 ¯ 0 } HCP | | { 1 1 ¯ 0 } FCC and 〈 0001 〉 HCP | | 〈 010 〉 FCC between the HCP and FCC phases have been observed in the present work. For the transformation of HCP → BCC → HCP, the OR is 0001 α 1 | | { 110 } β | | { 10 1 ¯ 0 } α 2 (HCP phase before the critical strain is defined as α 1-Ti, BCC phase is defined as β-Ti, and the HCP phase after the critical strain is defined as α 2-Ti). Energy evolution during the various loading processes further shows the plastic anisotropy of nanocrystalline Ti is determined by the stacking order of the atoms. The results in the present work will promote the in-depth study of the plastic deformation mechanism of HCP materials.

show abstract

Transitory phase transformations during {101¯2} twinning in titanium

Chen

Wang

2019

Acta Materialia

View full text Add to dashboard Cite

Molecular dynamics study of tension-compression asymmetry of nanocrystal α -Ti with stacking fault

Cited by 35 publications

References 56 publications

Effects of Anisotropy and In-Plane Grain Boundary in Cu/Pd Multilayered Films with Cube-on-Cube and Twinned Interface

Effects of Anisotropy and In-Plane Grain Boundary in Cu/Pd Multilayered Films with Cube-on-Cube and Twinned Interface

Anisotropic plasticity of nanocrystalline Ti: A molecular dynamics simulation*

Transitory phase transformations during {101¯2} twinning in titanium

Contact Info

Product

Resources

About