Deformation behavior and phase transformation of nanotwinned Al/Ti multilayers

Zhang, Y.F.; Li, Qiang; Gong, Mingyu; Xue, Sichuang; Ding, Jie; Li, Jin; Cho, J.; Niu, Tongjun; Su, Rong; Richter, Nicholas A.; Wang, Hao Yu; Wang, J.; Zhang, X.

doi:10.1016/j.apsusc.2020.146776

Cited by 28 publications

(8 citation statements)

References 65 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The initial crack length in each of the simulations is chosen to be 3 nm. The crystallographic orientation of Al and Ti in the multilayer system is taken from the experimentally observed orientation relationship [3] and is shown in figure 1(a).…”

Section: Simulation Methodologymentioning

confidence: 99%

See 1 more Smart Citation

Crack mediated dislocation activities in Al/Ti nanolayered composites: an atomistic study

Maurya¹,

Chandra²,

Nie³

et al. 2022

Modelling Simul. Mater. Sci. Eng.

View full text Add to dashboard Cite

In this work, to understand crack propagation in Al/Ti nanolayered composites, a series of molecular dynamic simulations were performed with crack in different layers of the nanolay- ered composites and subjected to mode-I loading. Nanolayered composite with a crack in Al layer, and monolithic Al show ductile fracture behavior that occurs by nucleation of Shockley partial dislocation at the crack tip. On the other hand, the fracture behavior in nanolayered composites with a crack in Ti shows crack bowing which is similar to the brittle fracture, and subsequent crack trapping at the interface. However, monolithic Ti shows typical cleavage fracture followed by activation of basal and pyramidal ⟨c + a⟩ slip that blunts the crack leading to ductile fracture. When the crack is in the Ti layer, the other Ti layers in a nanolayered composite deform by prismatic and pyramidal ⟨c + a⟩ slip. However, the Ti layer deforms only via slip on prismatic planes when the crack is in the Al layer. Critical strain energy release rate Gc based continuum analysis predicts the fracture mode in monolithic Ti correctly, but it fails to predict the fracture mode in monolithic Al and nanolayered composites with crack in the Al layer. It is found that the Gc determined based on external loading is marginally higher when the crack is in the Al layer as compared against the case when the crack is in the Ti layer. The Gc value for the basal and pyramidal slip in Ti is higher than the Gc value for cleavage. This poses an interesting phenomenon since the Gc in monolithic Al is found to be much lower than that of monolithic Ti. The reason is attributed to the constrained plasticity in the presence of an Al/Ti interface.

show abstract

Section: Simulation Methodologymentioning

confidence: 99%

“…The decrease in layer thickness results into a few interesting enhancements in mechanical properties of these metallic multilayers or nanolayered composites [1,2]. The mechanical properties and the deformation behavior of these nanolayered composites have been studied previously under various loading conditions [3,4].…”

Section: Introductionmentioning

confidence: 99%

Crack mediated dislocation activities in Al/Ti nanolayered composites: an atomistic study

Maurya¹,

Chandra²,

Nie³

et al. 2022

Modelling Simul. Mater. Sci. Eng.

View full text Add to dashboard Cite

show abstract

“…Later, it was revealed that TBs could be introduced into sputtered Al by tailoring the film thickness and texture [28,29]. Recently, various sputtered binary Al-X (X = Fe, Ti, Ni, Co, Mg) alloy systems have been shown to have abundant ITBs [30][31][32][33][34][35][36]. These boundaries in Al are strong barriers to dislocation motion, as demonstrated by in-situ nanoindentation [22].…”

Section: Contact X Zhangmentioning

confidence: 99%

Microstructural evolution of nanotwinned Al-Zr alloy with significant 9R phase

Richter

Zhang

Xie

et al. 2020

Materials Research Letters

Self Cite

View full text Add to dashboard Cite

Aluminum (Al) alloys have a multitude of applications, notably in the automotive, aerospace and coating industries, yet they exhibit significantly lower mechanical strength than conventional steels. Nanotwins drastically improve mechanical strength while retaining ductility. However, the high SFE of Al largely prevents twinning. Here, we synthesize Al-Zr alloy films containing an abundance of incoherent twin boundaries and 9R phases. These alloys exhibit an extended solid solubility of Zr, retaining a columnar nanotwinned structure across all compositions. These films reach a hardness up to 4.2 GPa with 10 at% Zr and demonstrate the capacity for producing strong Al alloys with nanotwins.

show abstract

“…[7,8] Especially, the nanolaminate structures can possess the advantages of the components used in the nanolaminates, and even obtain some unexpected achievements. [9][10][11][12][13][14] For example, the nanotwinned Al/Ti multilayers exhibited compressive strength up to 2.4 GPa, good hardness and work hardening capability, which was much higher than the pure Ti and Al. [12] In addition, the annealed Al/Ti nanolaminates possessed high flow stress (exceeding 3 GPa), work hardening capability, and good deformability.…”

Section: Introductionmentioning

confidence: 99%

“…[9][10][11][12][13][14] For example, the nanotwinned Al/Ti multilayers exhibited compressive strength up to 2.4 GPa, good hardness and work hardening capability, which was much higher than the pure Ti and Al. [12] In addition, the annealed Al/Ti nanolaminates possessed high flow stress (exceeding 3 GPa), work hardening capability, and good deformability. [13] The crystalline/crystalline interface (CCI) plays an important role in the improvement of the mechanical properties of the nanolaminates, but the stress often concentrates in the interphase interface, which may induce the nano-void in nanolam-inates.…”

Section: Introductionmentioning

confidence: 99%

Layer thickness dependent plastic deformation mechanism in Ti/TiCu dual-phase nano-laminates

et al. 2023

View full text Add to dashboard Cite

Crystalline/amorphous nanolaminate is an effective strategy to improve the mechanical properties of metallic materials, but the underlying deformation mechanism is still under the way of exploring. Here, the mechanical properties and plastic deformation mechanism of Ti/TiCu dual-phase nanolaminates (DPNLs) with different layer thickness are investigated using molecular dynamics simulations. The results indicate that the influence of the layer thickness on the plastic deformation mechanism in crystalline layer is negligible, while it affects the plastic deformation mechanism of amorphous layers distinctly. The crystallization of amorphous TiCu is exhibited in amorphous parts of the Ti/TiCu DPNLs, which is inversely proportional to the layer thickness. It is observed that the crystallization of the amorphous TiCu is a process driven by stress and heat. The Young’s modulus for the Ti/TiCu DPNLs are higher than that of composite material due to the amorphous/crystalline interfaces. Furthermore, the main plastic deformation mechanism in crystalline part: grain reorientation, transformation from hexagonal-close-packed-Ti to face-centered cubic-Ti and body-centered cubic-Ti, has also been displayed in present work. The results may provide a guideline for the design of high-performance Ti and its alloy.

show abstract

Deformation behavior and phase transformation of nanotwinned Al/Ti multilayers

Cited by 28 publications

References 65 publications

Crack mediated dislocation activities in Al/Ti nanolayered composites: an atomistic study

Crack mediated dislocation activities in Al/Ti nanolayered composites: an atomistic study

Microstructural evolution of nanotwinned Al-Zr alloy with significant 9R phase

Layer thickness dependent plastic deformation mechanism in Ti/TiCu dual-phase nano-laminates

Contact Info

Product

Resources

About