Abstract

Magnesium (Mg) alloys have a great potential for applications in the automobile, aerospace, and 3C industries due to their light weight, high specific strength, good conductivity, high damping capacity, and superior recyclability. However, the low strength and relatively low stiffness of Mg alloys seriously hinder their large-scale applications. In this work, a series of lightweight multicomponent Mg90.5-xAl5ZnxCu4Ce0.5 (x = 4, 8, 14, 18, and 23 at.%) alloys with high strength and high Young's modulus were designed based on the multicomponent alloys concept to obtain a high alloying degree by precipitating a large number of high Young's modulus phases, and prepared successfully by electric resistance furnace. The present results show that these alloys exhibit an excellent combination of exceptional compressive strength (up to 627 MPa) and high Young's modulus (up to 65 GPa), which is attributed to a large number of stable intermetallic phases with high cohesive energy and high Young's modulus, as verified by first-principles calculations. Our results may have implications for the design of Mg alloys and Mg-based composites with high strength and high stiffness.

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