Ultra-high strength and plasticity mediated by partial dislocations and defect networks: Part I: Texture effect

Su, Rong; Neffati, Dajla; Li, Qiang; Xue, Sichuang; Cho, Jaehun; Li, Jin; Ding, Jie; Zhang, Yifan; Fan, Cuncai; Wang, Haiyan; Kulkarni, Y.; Zhang, Xinghang

doi:10.1016/j.actamat.2019.11.049

Cited by 31 publications

(4 citation statements)

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“…It is worth mentioning that, for a similar volume fraction of stacking faults, fcc Co possesses higher H IT and lower H C than hcp Co. These differences may be attributed to symmetric fcc structure and effectiveness of 3D-nSFs structures in blocking dislocation motions compared to parallel stacking fault bands in hcp Co. − A compiled plot in Figure presents the H C - H IT relation of various Co including our work and literatures. First, both hcp and fcc Co with high density of stacking fault bands shows higher H IT and lower H C compared to NC hcp Co counterpart. − Second, when the 3D-nSFs density varies from 10% to 50%, fcc Co shows higher H IT and lower H C with large tunability, 100% for H C and 25% for H IT , respectively.…”

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confidence: 76%

High Strength and Low Coercivity of Cobalt with Three-Dimensional Nanoscale Stacking Faults

et al. 2021

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Lower coercivity (H C) and magnetic anisotropy (K 1) coupled with high mechanical strength are essential properties for Co-based soft magnetic thin films; however, the strength-coercivity trade-off limits their development. Co with face centered cubic structure (fcc) exhibits lower H C and K 1 than its grand hexagonal close packed structure (hcp); however, metastable fcc-phase Co is hard to stabilize. Here, by using Cu (100) seed layer, we synthesized micron-thick fcc Co films with self-formed three-dimensional nanoscale stacking faults (3D-nSFs) that could achieve high strengths without sacrificing soft magnetic properties. The 3D-nSFs, induced by the Co/Cu interface, could not only stabilize the metastable fcc Co to yield lower H C but also impede dislocation motion to strengthen Co films. More importantly, we successfully tailored the density of 3D-nSFs and confirmed a large variation in magnetic coercivity (by 100%) and indentation hardness (by 25%). This work provides a new strategy for integrated performance optimization by interface design and strain engineering.

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High Strength and Low Coercivity of Cobalt with Three-Dimensional Nanoscale Stacking Faults

et al. 2021

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“…3F). These SFs may arrive from the migration of Shockley partial dislocations (46)(47)(48)(49)(50). The migration of partials in Co-rich thick GBs may carry a small amount of plasticity but cannot explain the 20% giant uniform deformation of the entire Co 60 Al 40 pillar.…”

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confidence: 99%

High-strength nanocrystalline intermetallics with room temperature deformability enabled by nanometer thick grain boundaries

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et al. 2021

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Although intermetallics are attractive for their high strength, many of them are often brittle at room temperature, thereby severely limiting their potential as structural materials. Here, we report on a previously unidentified deformable nanocrystalline CoAl intermetallics with Co-rich thick grain boundaries (GBs). In situ micropillar compression studies show that nanocrystalline CoAl with thick GBs exhibits ultrahigh yield strength, exceeding 4.5 gigapascals. Unexpectedly, nanocrystalline CoAl intermetallics also show prominent work hardening to a flow stress of 5.7 gigapascals up to 20% compressive strain. Transmission electron microscopy studies show that deformation induces abundant dislocations inside CoAl grains with thick GBs, which accommodate plastic deformation. Molecular dynamics simulations reveal that the Co-rich thick GBs play a vital role in promoting nucleation of dislocations at the Co/CoAl interfaces, thereby enhancing the plasticity of the intermetallics. This study provides a perspective to promoting the plasticity of intermetallics via the introduction of thick GBs.

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“…In recent years, inspired by the multilayer structure in nature (e.g., abalone shells, peacock feathers, and butterfly wings), a variety of artificial multilayer structural materials have been successfully prepared and proven often have superior properties. [ 1 ] As shown in Figure 1 , multilayer materials are widely used in various fields such as biomedicine, [ 2 ] energy, [ 3 ] tactile sensor, [ 4 , 5 ] metal materials, [ 6 ] catalysis, power electronics, [ 7 ] and signal system. [ 8 ] Designing multilayer structural materials have become a promising method to improve the performance of dielectrics and has played a very important role in the exploitation of high energy‐storage performance dielectrics in particular.…”

Section: Introductionmentioning

confidence: 99%

Recent Advances in Multilayer‐Structure Dielectrics for Energy Storage Application

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An electrostatic capacitor has been widely used in many fields (such as high pulsed power technology, new energy vehicles, etc.) due to its ultrahigh discharge power density. Remarkable progress has been made over the past 10 years by doping ferroelectric ceramics into polymers because the dielectric constant is positively correlated with the energy storage density. However, this method often leads to an increase in dielectric loss and a decrease in energy storage efficiency. Therefore, the way of using a multilayer structure to improve the energy storage density of the dielectric has attracted the attention of researchers. Although research on energy storage properties using multilayer dielectric is just beginning, it shows the excellent effect and huge potential. In this review, the main physical mechanisms of polarization, breakdown and energy storage in multilayer structure dielectric are introduced, the theoretical simulation and experimental results are systematically summarized, and the preparation methods and design ideas of multilayer structure dielectrics are mainly described. This article covers not only an overview of the state-of-the-art advances of multilayer structure energy storage dielectric but also the prospects that may open another window to tune the electrical performance of the electrostatic capacitor via designing a multilayer structure.

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Ultra-high strength and plasticity mediated by partial dislocations and defect networks: Part I: Texture effect

Cited by 31 publications

References 76 publications

High Strength and Low Coercivity of Cobalt with Three-Dimensional Nanoscale Stacking Faults

High Strength and Low Coercivity of Cobalt with Three-Dimensional Nanoscale Stacking Faults

High-strength nanocrystalline intermetallics with room temperature deformability enabled by nanometer thick grain boundaries

Recent Advances in Multilayer‐Structure Dielectrics for Energy Storage Application

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