材料科学
石墨烯
复合材料
极限抗拉强度
酒窝
原位
延展性(地球科学)
纳米颗粒
成核
复合数
纳米技术
化学
蠕动
有机化学
作者
Wan Qi Jie,Jinglun Yang,Xinyi Zhou,Biao Chen,Jianghua Shen,Katsuyoshi Kondoh,Jinshan Li
出处
期刊:Carbon
[Elsevier]
日期:2023-02-01
卷期号:204: 447-455
被引量:14
标识
DOI:10.1016/j.carbon.2022.12.088
摘要
Ductility collapse is a stubborn issue for developing high-strength aluminum (Al) matrix composites reinforced with graphene nanosheets (GNSs). In order to solve this problem, here we introduced large amount of in-situ alumina nanoparticles (∼3 vol%) into the GNSs/Al composite to boost its dimple fracture capability. Microstructural characterization showed that the introduced alumina nanoparticles were α-Al2O3 with a diameter of ∼30 nm, which were distributed uniformly on the Al matrix. Tensile tests revealed that the composite possesses a high tensile strength of 464 MPa and appreciable amount of ductility (8.9%), the combination of which was superior to those in literatures. Fractographic analysis suggested that the in-situ alumina nanoparticles acted as nucleation sites for dimples and enabled strain-delocalization, leading to enhanced plastic deformability. An analysis on strengthening mechanisms further confirmed the synergistic reinforcing effect of ex-situ GNSs and in-situ alumina nanoparticles. These findings may provide guidance for promoting the mechanical properties of GNSs/Al composites.
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