Effect of ZrO2 Nanoparticles and Mechanical Milling on Microstructure and Mechanical Properties of Al–ZrO2 Nanocomposites

IF 1.5 4区 材料科学 Q3 ENGINEERING, MECHANICAL
Sinem Aktaş, Ege A Diler
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引用次数: 1

Abstract

Nano-aluminum powders and nano-ZrO2 reinforcement particles were mechanically milled and hot-pressed to produce Al–ZrO2 nanocomposites. Microstructure and mechanical properties of Al–ZrO2 nanocomposites were investigated using scanning electron microscope (SEM), energy-dispersive X-ray spectroscopy (EDX), and X-ray diffraction (XRD) analyses and by performing hardness and compression testing. Uniform particle distribution was obtained up to 3 wt% of nano-ZrO2 particles using nano-sized aluminum powders as matrix powders and by applying a mechanical milling process. As the nano-ZrO2 reinforcement particles were uniformly distributed in the matrix, the relative density of the Al–ZrO2 nanocomposites increased up to 3 wt% nano-ZrO2 particles with an increase in milling time; on the other hand, the relative density decreased and the porosity increased with high-weight fractions (>3 wt%) of nano-ZrO2 particles due to the negative combined effect of less densification and an increase in the number of particle clusters. The hardness and compressive strength of the Al–ZrO2 nanocomposites improved despite increased porosity. However, the compressive strength of Al–ZrO2 nanocomposites with a high amount (>3 wt%) of nano-ZrO2 particles began to decrease due to the negative combined effect of the less densification of the powder particles and the clustering of nano-ZrO2 reinforcement particles. The brittle-ductile fracture occurred in the Al–ZrO2 nanocomposites.
ZrO2纳米颗粒和机械铣削对Al-ZrO2纳米复合材料微观结构和力学性能的影响
采用机械研磨和热压法制备了纳米铝粉和纳米zro2增强颗粒Al-ZrO2纳米复合材料。采用扫描电镜(SEM)、能量色散x射线能谱(EDX)、x射线衍射(XRD)分析以及硬度和压缩测试研究了Al-ZrO2纳米复合材料的微观结构和力学性能。以纳米铝粉为基体粉末,采用机械铣削工艺,得到的纳米zro2颗粒分布均匀,达到3wt %。随着纳米zro2增强颗粒在基体中的均匀分布,随着磨矿时间的延长,Al-ZrO2纳米复合材料的相对密度增加到3wt %;另一方面,高质量分数(>3 wt%)的纳米zro2颗粒,由于密度降低和颗粒团簇数量增加的负联合作用,相对密度降低,孔隙率增加。尽管孔隙率增加,但Al-ZrO2纳米复合材料的硬度和抗压强度有所提高。然而,高含量(>3 wt%)纳米zro2颗粒的Al-ZrO2纳米复合材料的抗压强度开始下降,这是由于粉末颗粒密度降低和纳米zro2增强颗粒聚集的负联合作用。Al-ZrO2纳米复合材料发生脆性-韧性断裂。
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来源期刊
CiteScore
3.00
自引率
0.00%
发文量
30
审稿时长
4.5 months
期刊介绍: Multiscale characterization, modeling, and experiments; High-temperature creep, fatigue, and fracture; Elastic-plastic behavior; Environmental effects on material response, constitutive relations, materials processing, and microstructure mechanical property relationships
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