Carbon nanotubes (CNTs) and graphene nanoplatelets (GNPs) are added into an AZ31 matrix to obtain a composite with high performance via the powder metallurgy (PM) approach. The results reveal that the hybrid (CNT + GNP) reinforcements are dispersed uniformly in the Mg matrix with the help of intertwining and embedding effects of CNTs. The hybrid (CNT + GNP)/AZ31 nanocomposite exhibits simultaneous improvement in strength (315 MPa) and ductility (18.5%) compared with its matrix and nanocomposites reinforced with individual CNTs or GNPs, indicating a synergistic strengthening and toughening effects. The dominant strengthening mechanism might be load transfer generating from the good interface bonding between the hybrid (CNTs + GNPs) nanoreinforcements and the AZ31 matrix. In addition, thermal mismatch strengthening and the Orowan mechanism might also contribute to the increase in strength, and the significant improvement in ductility might mainly benefit from the weakened basal texture and the increase in strain hardening rate caused by the uniformly dispersed hybrid (CNTs + GNPs), which can trap mobile dislocations in the matrix.

中文翻译：

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混合（碳纳米管+石墨烯纳米片）/AZ31复合材料同时增强强度和延展性

将碳纳米管 (CNT) 和石墨烯纳米片 (GNP) 添加到 AZ31 基体中，通过粉末冶金 (PM) 方法获得高性能复合材料。结果表明，在 CNT 的缠绕和嵌入效应的帮助下，杂化 (CNT + GNP) 增强材料均匀地分散在 Mg 基体中。与用单个 CNT 或 GNP 增强的基体和纳米复合材料相比，混合 (CNT + GNP)/AZ31 纳米复合材料的强度（315 MPa）和延展性（18.5%）同时提高，表明具有协同强化和增韧效果。主要的强化机制可能是由混合（CNTs + GNPs）纳米增强材料和 AZ31 基体之间良好的界面键合产生的负载转移。此外，