Nanostructured amorphous Al2O3-ZrO2 (La2O3) ceramics with plastic deformation via interface inducing hierarchical shear bands

IF 9.4 1区材料科学 Q1 ENGINEERING, MECHANICAL International Journal of Plasticity Pub Date : 2024-08-21 DOI:10.1016/j.ijplas.2024.104103

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Abstract

Ionic-bonded ceramics are featured by their thermal stability, corrosion resistance, hardness and strength, but their applications are limited by the inherent brittleness. Ceramics are composed of strong chemical bonding and intricate crystal structures, making plastic deformation by dislocation slip highly challenging. A nanostructured amorphous Al₂O₃-ZrO₂ ceramic comprising nanoscale amorphous particles and amorphous interfaces between particles was achieved in practice, where the amorphous interface is in scale of approximately 2.34 nm and amorphous particles is in width of approximately 6.75 nm. Based on nano-indentation tests, the shear transformation zone (STZ) volumes of nanostructured amorphous ceramics hot-pressed under various conditions are calculated, suggesting attenuation of free volume with the increase in pressure and temperature. The medium-temperature compression test of the samples exhibits a permanent plastic deformation of 14.6 %, with the presence of hierarchical shear bands in the deformed samples. The main shear bands (MSBs) in width of 0.84–9.15 μm are generated by the stress concentration in crystal-amorphous interface, and the small shear bands (SSBs) of 31–428 nm are related to abundant free volumes in the interface between amorphous particles.

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通过界面诱导分层剪切带产生塑性变形的纳米结构非晶 Al2O3-ZrO2 (La2O3) 陶瓷

离子键陶瓷具有热稳定性、耐腐蚀性、硬度和强度等特点，但其固有的脆性限制了其应用。陶瓷由强化学键和错综复杂的晶体结构组成，通过位错滑移实现塑性变形极具挑战性。在实践中获得了一种由纳米级非晶粒子和粒子间非晶界面组成的纳米结构非晶 Al2O3-ZrO2 陶瓷，其中非晶界面的尺度约为 2.34 纳米，非晶粒子的宽度约为 6.75 纳米。根据纳米压痕测试，计算了在不同条件下热压纳米结构非晶陶瓷的剪切转化区（STZ）体积，表明自由体积随压力和温度的增加而减小。样品的中温压缩试验显示出 14.6% 的永久塑性变形，变形样品中存在分层剪切带。宽度为 0.84-9.15 μm 的主剪切带（MSBs）是由晶体-非晶体界面的应力集中产生的，而宽度为 31-428 nm 的小剪切带（SSBs）则与非晶体颗粒之间界面丰富的自由体积有关。

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来源期刊

International Journal of Plasticity 工程技术-材料科学：综合

CiteScore

15.30

自引率

26.50%

发文量

256

审稿时长

46 days

期刊介绍： International Journal of Plasticity aims to present original research encompassing all facets of plastic deformation, damage, and fracture behavior in both isotropic and anisotropic solids. This includes exploring the thermodynamics of plasticity and fracture, continuum theory, and macroscopic as well as microscopic phenomena. Topics of interest span the plastic behavior of single crystals and polycrystalline metals, ceramics, rocks, soils, composites, nanocrystalline and microelectronics materials, shape memory alloys, ferroelectric ceramics, thin films, and polymers. Additionally, the journal covers plasticity aspects of failure and fracture mechanics. Contributions involving significant experimental, numerical, or theoretical advancements that enhance the understanding of the plastic behavior of solids are particularly valued. Papers addressing the modeling of finite nonlinear elastic deformation, bearing similarities to the modeling of plastic deformation, are also welcomed.