Towards damage resistant Al2O3–SiO2 glasses with structural and chemical heterogeneities through consolidation of glassy nanoparticles
Towards damage resistant Al2O3–SiO2 glasses with structural and chemical heterogeneities through consolidation of glassy nanoparticles
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DOI：
10.1016/j.actamat.2021.117016
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发表时间：
2021-05
期刊：
影响因子：
9.4
通讯作者：
Yanming Zhang;Liping Huang;Yunfeng Shi
中科院分区：
文献类型：
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作者：
Yanming Zhang;Liping Huang;Yunfeng Shi
采用经典分子动力学模拟方法，通过固结不同组成的Al 2 O3-SiO2二元玻璃纳米颗粒，制备了具有结构和化学异质性的Al 2 O3-SiO2二元玻璃。固结玻璃显示出优异的延展性和增强的流动强度。研究发现，在固结过程中产生的过配位网络形成体和相邻氧等结构异质性是塑性载体，提高了材料的延性。另一方面，强化玻璃中的增强的屈服强度是由于从起始玻璃状纳米颗粒继承的化学不均匀性，其不损害延展性。此外，在固结玻璃中，在冷加工后出现明显的加工硬化行为，在40%冷加工后屈服强度从约3.3 GPa增加到约6.4 GPa。用玻璃态纳米颗粒固结可能是合成通过传统熔融淬火工艺无法获得的坚固、抗损伤和透明的氧化物玻璃的可行方法。
Al2O3–SiO2binary glasses with structural and chemical heterogeneities were prepared by consolidating glassy nanoparticles with different compositions using classical molecular dynamics simulations. Consolidated glasses show both excellent ductility and enhanced flow strength. It was found that the structural heterogeneities such as over-coordinated network formers and neighboring oxygen induced during consolidation serve as plasticity carriers to increase the ductility. On the other hand, the enhanced yield strength in consolidated glasses is due to the chemical heterogeneity inherited from the starting glassy nanoparticles, which does not compromise the ductility. Furthermore, apparent work hardening behavior appears upon cold work in the consolidated glasses, with an increase in yield strength from ~3.3 to ~6.4 GPa after 40% cold work. Consolidation with glassy nanoparticles could be a viable way to synthesize strong, damage resistant and transparent oxide glasses that cannot be obtained through the traditional melt-quench process.