Abstract The Young’s modulus of aluminum-based materials is one of the most important mechanical properties in controlling structural performance. The improvement of the Young’s modulus of castable aluminum-based materials is essential for improving their competiveness in light weighting structural applications. Currently, there are limited options for cast aluminum alloys with outstanding Young’s modulus. Also, for further stiffness improvement and thereby weight lightening, in-depth understanding of the relevant mechanisms for modulus improvement in aluminum alloys is necessary. This review focuses on the Young’s modulus of cast aluminum-based composites, as well as aluminum alloys reinforced with continuous metallic fibers (bimetallic materials). The effect of different chemical elements in cast alloys, the constituents of in-situ and ex-situ formed aluminum matrix composites, and the wire-enhanced bimetallic materials on the Young’s modulus of aluminum-based materials are reviewed. The Young’s modulus of cast aluminum alloys can be improved by: (a) introducing high modulus reinforcement phases – such as TiB2, SiC, B4C, and Al2O3 – into aluminum by in-situ reactions or by ex-situ additions; and (b) forming bimetallic materials with metallic wire/bar reinforcement in the aluminum matrix. The performance of a stiff aluminum alloy depends on the volume fraction, size, and distribution of the high modulus phases as well as the interface between reinforcement and Al matrix. One of the major concerns is the reduction of the ductility of castings after adding specific high modulus phases to increase the Young’s modulus. Further research into the improvement of Young’s modulus and the ductility of aluminum alloys is necessary through proper selection of reinforcement, optimizing interface, and distribution of reinforcement.

中文翻译：

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高刚度铝基复合材料和双金属材料综述

摘要 铝基材料的杨氏模量是控制结构性能最重要的力学性能之一。可浇注铝基材料杨氏模量的提高对于提高它们在轻量化结构应用中的竞争力至关重要。目前，具有出色杨氏模量的铸造铝合金的选择有限。此外，为了进一步提高刚度，从而减轻重量，需要深入了解铝合金模量提高的相关机制。本综述重点关注铸铝基复合材料以及用连续金属纤维（双金属材料）增强的铝合金的杨氏模量。不同化学元素对铸造合金的影响，综述了原位和异位成型铝基复合材料的成分，以及线增强双金属材料对铝基材料杨氏模量的影响。铸造铝合金的杨氏模量可以通过以下方式提高： (a) 通过原位反应或异位添加将高模量增强相——如 TiB2、SiC、B4C 和 Al2O3——引入铝中；(b) 在铝基体中形成具有金属线/条增强的双金属材料。硬铝合金的性能取决于高模量相的体积分数、尺寸和分布以及增强材料和铝基体之间的界面。主要问题之一是在添加特定的高模量相以增加杨氏模量后铸件的延展性降低。