Lightweight casting aluminum structural components, in particular shaped castings, are usually designed on the criteria of either yield strength or stiffness (Young’s modulus). Currently, there are limited options for the aluminum alloys with outstanding Young’s modulus. Following our review on the stiffness of aluminum-based composites and bimetallics, this review focuses on the effect of different chemical elements on the Young’s modulus of cast aluminum alloys and their microstructures. The influence of alloying elements on the Young’s modulus depends on the state. If the alloying elements are in a solid solution phase, the magnitude of the Young’s modulus is determined by the nature of the atomic interactions. If the alloying elements form second phases, the magnitude of the Young’s modulus is determined by the volume fraction and the intrinsic modulus of the second phase. Among the available elements, Be, Li, Si, Mn, and Ni are favorite candidates to enhance the modulus of cast aluminum alloys. The increase of Young’s modulus in commercial cast aluminum alloys can be significantly improved through adding appropriate alloying elements. Therefore, further research into the improvement of Young’s modulus of aluminum alloys is necessary.

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铸造轻质硬质铝合金：评论

轻质铸铝结构部件，特别是异型铸件，通常根据屈服强度或刚度（杨氏模量）的标准进行设计。当前，具有优异的杨氏模量的铝合金的选择有限。在我们对铝基复合材料和双金属的刚度进行了综述之后，本综述着重于不同化学元素对铸造铝合金的杨氏模量及其微观结构的影响。合金元素对杨氏模量的影响取决于状态。如果合金元素处于固溶相，则杨氏模量的大小由原子相互作用的性质决定。如果合金元素形成第二相，杨氏模量的大小由第二相的体积分数和固有模量确定。在可用元素中，Be，Li，Si，Mn和Ni是提高铸造铝合金模量的首选材料。通过添加适当的合金元素，可以显着改善商业铸造铝合金中杨氏模量的增加。因此，有必要进一步研究提高铝合金的杨氏模量。