The rise of plastic deformation in boron nitride ceramics

Wu, Yingju; Zhang, Yang; Zhang, Shuangshuang; Wang, Xiaoyu; Liang, Zitai; Hu, Wentao; Zhao, Zhisheng; He, Julong; Xu, Bo; Liu, Zhongyuan; Tian, Yongjun

doi:10.1007/s40843-020-1466-0

Cited by 13 publications

(7 citation statements)

References 26 publications

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“…Micro‐ or nanostructure design has already been employed in some vdW materials to enhance plasticity, such as BN, which opens a new avenue for large plastic deformation of polycrystalline vdW materials. [ 3 ] Achieving large deformation in graphite or graphene by means of microstructure manipulation also attracts researchers’ attention. [ 4–7 ]…”

Section: Introductionmentioning

confidence: 99%

Sugar‐Derived Isotropic Nanoscale Polycrystalline Graphite Capable of Considerable Plastic Deformation

et al. 2022

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plasticity under compressive stress, suggesting that such deformation can be controlled. [2] However, this material is strongly anisotropic owing to its limited number of slip systems. Micro-or nanostructure design has already been employed in some vdW materials to enhance plasticity, such as BN, which opens a new avenue for large plastic deformation of polycrystalline vdW materials. [3] Achieving large deformation in graphite or graphene by means of microstructure manipulation also attracts researchers' attention. [4][5][6][7] The sp 2 hybridization in graphene layers makes them capable of resisting in-plane stretching and compression, while their ability to bend and fold enables them to sustain large elastic distortions. These features have been demonstrated in carbon nanotubes (CNTs), graphene sheets, and fullerenes. [8] Carbonaceous materials are classified as amorphous carbon and crystalline carbon. Graphite crystallites typically do not grow in amorphous carbon, even after heat treatment at high temperatures. Thus, amorphous carbon Obtaining large plastic deformation in polycrystalline van der Waals (vdW) materials is challenging. Achieving such deformation is especially difficult in graphite because it is highly anisotropic. The development of sugar-derived isotropic nanostructured polycrystalline graphite (SINPG) is discussed herein. The structure of this material preserves the high in-plane rigidity and out-of-plane flexibility of graphene layers and enables prominent plasticity by activating the rotation of nanoscale (5-10 nm) grains. Thus, micrometersized SINPG samples demonstrate enhanced compressive strengths of up to 3.0 GPa and plastic strains of 30-50%. These findings suggest a new pathway for enabling plastic deformation in otherwise brittle vdW materials. This new class of nanostructured carbon materials is suitable for use in a broad range of fields, from semiconductor to aerospace applications.

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Section: Introductionmentioning

confidence: 99%

Sugar‐Derived Isotropic Nanoscale Polycrystalline Graphite Capable of Considerable Plastic Deformation

et al. 2022

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“…The difficulty in assessing the hardness, especially with a variable temperature, partially lies in the fact that hardness is an engineering quantity determined using a specific measurement method and cannot be evaluated directly using quantum mechanics [16]. During the hardness measurement, plastic deformation must occur in the sample (e.g., a permanent impression or dent), which is correlated with the dislocation behaviors in the sample [1,17,18]. While this dislocation-governed plastic deformation has been widely investigated for metals [19][20][21][22], understanding the plastic deformation and therefore the hardness of covalent materials is still an active research area [23].…”

Section: Introductionmentioning

confidence: 99%

Temperature-dependent hardness of zinc-blende structured covalent materials

et al. 2021

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Understanding the temperature-dependent hardness of covalent materials is of fundamental scientific interest and crucial technical importance. Here we propose a temperature-dependent hardness formula for zinc-blende structured covalent materials based on the dislocation theory. Our results indicate that at low temperatures, the Vickers hardness is primarily modulated by Poisson's ratio and the shear modulus, with the latter playing a dominant role. With an increase in temperature, the governing mechanism for the plastic deformation switches from shuffle-set dislocation control to glide-set dislocation control, and the hardness decreases precipitously at elevated temperatures. Moreover, the intrinsic parameter a 3 G is revealed for zinc-blende structured covalent materials, which represents the resistance of a material to softening at high temperatures. This temperaturedependent hardness model agrees remarkably well with the experimental data of zinc-blende structured covalent materials. This work not only sheds light on the physical origin of hardness, but also provides a practical guide for the design of superhard materials.

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“…When the first unloading starts, the stress rapidly decreases to zero with residual plastic strain ( ε p ∼ 20%), demonstrating irreversible plastic deformation accumulating in the a-BN ribbon with a substantial hysteresis loop between loading and unloading. 31 The maximum tensile stress is 205 MPa in the first cycle. Fig.…”

Section: Resultsmentioning

confidence: 99%

“…A-BN microribbon preparation and characterization BN ceramics are traditionally sintered at high temperatures, frequently as bulks and powders, 32 and their mechanical properties are typically evaluated by compressive properties, 31 since it is challenging to conduct tensile experiments considering their poor mechanical processability. In addition, nanomechanical tension/compression usually necessitates shaping the sample using micro-nano processing procedures such as the focused ion beam (FIB), which may cause extra damage.…”

Section: Resultsmentioning

confidence: 99%

“…[23][24][25][26][27][28][29] So far, extensive attempts have been made to improve the compressive plasticity of nitride-based ceramic materials, such as the recently founded coherent interfacial bond switching induced plasticity in silicon nitride ceramics, 30 and the plastic BN is achieved by sintering onion BN into BN sheets wherein the three-dimensional interlocking between the layers contributes to the plastic deformation. 31 However, the tensile plastic deformation of BN ceramics is still limited, and the corresponding plastic mechanism is unclear due to the lack of in situ experimental measurements at a small scale.…”

Section: Materials Horizonsmentioning

confidence: 99%

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