Role of Al in the Solution Strengthening of Mg–Al Binary Alloys

Tingting Liu,Shibo Zhou,Yanglu Liu,Lu Xiao,Bo Song

doi:10.3390/met12010084

Tingting Liu, Shibo Zhou + Show 3 more

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https://doi.org/10.3390/met12010084

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Abstract

Mg–Al binary alloys in the concentration range from 0 to 4.0 wt.% Al have been prepared under conventional casting conditions. The as-cast Mg and Mg–Al alloys after solution treatment were processed via hot extrusion at 350 °C. The results show that Al has a positive influence on grain refinement and solution strengthening. The as-extruded Mg–Al alloys are fully recrystallized, and the tensile yield strength of the binary alloys is two times higher than that of pure Mg. Furthermore, the elongations of Mg–Al alloys are much higher than that of pure Mg. In addition, Mg and Mg–Al alloys were further studied by the viscoplastic self-consistent (VPSC) model to explore the activation and evolution of deformation modes. The simulation results match well with the experimental results.

Highlights

As the lightest structural metallic material, magnesium has much wide application prospect, because of its good castability, good machinability, good electromagnetic shielding capability, good weldability and so on
Adding alloying elements to pure magnesium can make a significant improvement, so that magnesium alloys are provided with various properties to meet different requirements [2,3]
A comparison of the untreated (Figure 1a,c,e,g) with homogenized samples (Figure 1b,d,f,h) indicates that the second phases are nearly dissolved into the matrix within the four different samples at 420 ◦ C after heat-treatment of the solid solution

Summary

Introduction

As the lightest structural metallic material, magnesium has much wide application prospect, because of its good castability, good machinability, good electromagnetic shielding capability, good weldability and so on. Aluminum is the commonly used alloying element to improve the mechanical properties, enhance die castability and corrosion resistance of magnesium alloys [4,5]. Mg17 Al12 phases can significantly affect the corrosion, wear and mechanical properties of Mg–Al alloys [8,9,10]. Many studies show that the existence of Mg17 Al12 precipitates has a great influence on the grain structure during thermal deformation, affecting the strength of the deformed alloy [11,12,13,14]. The effect of Al atoms solid solution in Mg on the mechanical properties and deformation behavior of magnesium alloys is rarely studied

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