Defects and plasticity in ultrastrong supercrystalline nanocomposites.
Defects and plasticity in ultrastrong supercrystalline nanocomposites.
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DOI：
10.1126/sciadv.abb6063
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发表时间：
2021-01
期刊：
影响因子：
13.6
通讯作者：
Schneider GA
中科院分区：
文献类型：
--
作者：
Giuntini D;Zhao S;Krekeler T;Li M;Blankenburg M;Bor B;Schaan G;Domènech B;Müller M;Scheider I;Ritter M;Schneider GA
超结晶纳米复合材料即使在强度提高后也能像原子晶体一样塑性变形，并具有压实的特征。超晶纳米复合材料是一种应用范围不断扩大但结构行为尚未得到充分研究的纳米结构材料。它们通常由排列成类似于晶格的周期性结构的有机官能化无机纳米颗粒组成，包括由加工或机械负载引起的超晶格缺陷。虽然具有各种有前途的功能特性，但它们缺乏机械鲁棒性和未知的变形机制阻碍了它们在设备中的实现。我们表明，超晶体材料的压痕与单晶中遇到的相同的变形模式。超晶体以堆积、位错和滑移带的形式容纳塑性变形。这些现象至少部分地发生在有机配体交联之后，这导致纳米复合材料的多重强化。结晶材料的经典剪切理论可以很好地描述超结晶纳米复合材料的行为，其结果是具有弹塑性行为，伴随着压实。
Supercrystalline nanocomposites deform plastically like atomic crystals, even after a boost in strength, and feature compaction. Supercrystalline nanocomposites are nanoarchitected materials with a growing range of applications but unexplored in their structural behavior. They typically consist of organically functionalized inorganic nanoparticles arranged into periodic structures analogous to crystalline lattices, including superlattice imperfections induced by processing or mechanical loading. Although featuring a variety of promising functional properties, their lack of mechanical robustness and unknown deformation mechanisms hamper their implementation into devices. We show that supercrystalline materials react to indentation with the same deformation patterns encountered in single crystals. Supercrystals accommodate plastic deformation in the form of pile-ups, dislocations, and slip bands. These phenomena occur, at least partially, also after cross-linking of the organic ligands, which leads to a multifold strengthening of the nanocomposites. The classic shear theories of crystalline materials are found to describe well the behavior of supercrystalline nanocomposites, which result to feature an elastoplastic behavior, accompanied by compaction.
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影响因子：
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作者：
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通讯作者：
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DOI：
10.1016/j.jeurceramsoc.2019.03.053
发表时间：
2019-08-01
影响因子：
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作者：
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影响因子：
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影响因子：
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作者：
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影响因子：
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作者：
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