Abstract
Building a gradient structure inside the Mg alloy structure can be expected to greatly improve its comprehensive mechanical properties. In this study, AZ31/Mg–Sc laminated composites with gradient grain structure were prepared by hot extrusion. The microstructure and mechanical properties of the Mg–1Sc alloy with different extrusion temperatures and surface AZ31 fine-grain layers were investigated. The alloy has a more obvious gradient microstructure when extruded at 350 °C. The nanoscale hardness value of Mg–1Sc alloy was improved through fine-grain strengthening and solution strengthening of the surface AZ31 fine-grain layer. The strength of Mg–1Sc alloy was improved due to the fine-grain strengthening and dislocation strengthening of the surface AZ31 fine-grain layer, and the elongation of Mg–1Sc alloy was increased by improving the distribution of the microstructure.
Highlights
Magnesium (Mg) alloys have the advantages of low density, high specific strength, good damping capacity, machinability, and retrievability, which have broad application prospects in the fields of transportation, aerospace, the military industry, and so on [1,2,3,4]
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The AZ31 alloy adhered to the surface of the Mg–Sc alloy to form a composite alloy in the process of hot extrusion at 320 °C or 350 °C
Summary
Magnesium (Mg) alloys have the advantages of low density, high specific strength, good damping capacity, machinability, and retrievability, which have broad application prospects in the fields of transportation, aerospace, the military industry, and so on [1,2,3,4]. Due to the close-packed hexagonal crystal structure of Mg alloys, insufficient slipping systems can be activated at lower temperatures, resulting in poor ductility and low strength [5,6]. The mechanical properties of Mg alloys depend on grain size and orientation to a great extent. Controlling texture and refining the grain by proper processing technology is an important method to improve the mechanical properties of Mg alloys [7]. Grain refinement can improve the strength of Mg alloys obviously, but the ductility of Mg alloys is sacrificed to some extent, so that the relationship between strength and ductility is always inverted [8]. Previous studies [9,10] showed that the introduction of a gradient structure in metal materials can break the original coupled material properties and allow one or more properties to be improved independently, which provides a new idea and development direction for the preparation of high strength and high ductility materials
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