Microstructures, tensile properties, and strengthening mechanisms of novel Al-Mg alloys with high Mg content

A weldable Al–Mg–Zn–Sc alloy was produced using vacuum induction melting and an argon-protected casting method to achieve high strength and ductility, and the effects of heat treatment on the microstructure evolution and mechanical properties of Al–Mg–Zn–Sc alloys were comparatively investigated. The results reveal that fine equiaxed grains with an average grain size of 40 μm in an as-cast Al–Mg–Zn–Sc alloy change little after heat treatments, bringing about a grain-boundary strengthening of 46.1 MPa. The coarse T-Mg32(Al, Zn)49 phases at grain boundaries are completely dissolved into the matrix through solid-solution treatment, and T-Mg32(Al, Zn)49 with diameters ranging from 10 to 25 nm and Al3Sc with diameters ranging from 5 to 20 nm gradually precipitate during the artificial aging process. The Mg solid solubility is 4.67% in the as-cast Al–Mg–Zn–Sc alloy, and it increased to 5.33% after solid-solution treatment and dramatically decreased to 4.15% after post-aging treatment. The contributions of solid-solution strengthening to as-cast, post-solid-solution and post-aging Al–Mg–Zn–Sc alloys are 78.2 MPa, 85.4 MPa and 72.3 MPa, respectively. The precipitation strengthening of the post-aging alloy is 49.7 MPa, which is an increase of 21% in comparison to that of both as-cast and post-solid-solution alloys. The alloy achieves an optimal tensile strength of 355.3 MPa, yield strength of 175 MPa and elongation of 22% after undergoing solid-solution treatment.

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“…where r is the mean radius of the precipitate. M = 3.06 is the Taylor factor [34]. ν is the Poisson's ratio of this alloy (0.32).…”

Section: Discussionmentioning

confidence: 99%

“…b is the Burgers vector of Al (0.286 nm). λ is the precipitate edge spacing, which can be calculated by the following equation (the volume fraction (f )) [34]:…”

Section: Discussionmentioning

confidence: 99%

Effects of Heat Treatment on Microstructure and Mechanical Properties of Weldable Al–Mg–Zn–Sc Alloy with High Strength and Ductility

et al. 2023

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“…Al–Mg alloys have extensive applications in the field of aerospace and shipbuilding, due to their low density, favourable corrosion resistance, excellent formability and weldability. 1–4 Al–Mg alloys are a non-heat-treatable strengthening aluminium alloy, so the strength is mainly improved by solid solution strengthening and work hardening. 5,6 The strength of Al–Mg alloys improves significantly with the increase in Mg content, and it has been shown that the ultimate tensile strength of Al–Mg alloys improves by about 35 MPa with an increase of 1.0 wt-% of Mg content.…”

Section: Introductionmentioning

confidence: 99%

Effect of Cu addition on the mechanical properties and corrosion behaviours of Al–9.2Mg–0.8Mn alloy

Hao,

Xia,

et al. 2024

Corrosion Engineering, Science and Technology: The Internationa

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Microalloying is an effective method to improve the properties of Al–Mg alloys. The microstructure, mechanical properties and corrosion behaviours of Al–9.2Mg–0.8Mn– xCu ( x = 0–1.2 wt-%) alloys are studied to promote the application of Al–Mg alloys. The addition of Cu increases the strength of the alloy, where the ultimate tensile strength of 0.6 wt-% Cu alloy is improved by 43 MPa. Moreover, the addition of Cu significantly affects the corrosion behaviours of alloys. For as-sensitised alloys, compared to the matrix, the 0.1 wt-% Cu alloy shows a 28.3% reduction in pitting corrosion mass loss, which is attributed to the Cu element can form a stable passivation film, and the 0.3 wt-% Cu alloy shows a 15% reduction in intergranular corrosion mass loss, which is attributed to the addition of Cu can restrict the β phase precipitation at grain boundaries. The study shows that Cu-alloying can improve the comprehensive properties of Al–9.2Mg–0.8Mn alloys.

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Improving the Mechanical Properties and Intergranular Corrosion Resistance of Al-9.2Mg-0.8Mn-0.2Zr Alloy by Sn Addition

Hao,

Xia,

et al. 2024

J. of Materi Eng and Perform

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Microstructures, tensile properties, and strengthening mechanisms of novel Al-Mg alloys with high Mg content

Cited by 11 publications

References 44 publications

Effects of Heat Treatment on Microstructure and Mechanical Properties of Weldable Al–Mg–Zn–Sc Alloy with High Strength and Ductility

Effects of Heat Treatment on Microstructure and Mechanical Properties of Weldable Al–Mg–Zn–Sc Alloy with High Strength and Ductility

Effect of Cu addition on the mechanical properties and corrosion behaviours of Al–9.2Mg–0.8Mn alloy

Improving the Mechanical Properties and Intergranular Corrosion Resistance of Al-9.2Mg-0.8Mn-0.2Zr Alloy by Sn Addition

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