Abstract
In this work, we investigated a novel Al-Mg-Si alloy, which was developed from an AA 6082, in order to considerably improve the yield and tensile strengths whilst retain excellent ductility. The new alloy possesses a higher content of Si than specified by AA 6082, and, in addition, it contains copper and zirconium. The alloy was characterized in the as-cast condition, after homogenization, extrusion, and T6 heat treatment using light microscopy, scanning and transmission electron microscopy with energy dispersive spectrometry, X-ray diffraction, differential thermal analysis and tensile testing. After T6 temper, tensile strengths were around 490 MPa with more than 10% elongation at fracture. The microstructure consisted of small-grained Al-rich matrix with α-AlMnSi and Al3Zr dispersoids, and Q′-AlCuMgSi and β-Mg2Si-type precipitates.
Highlights
The manufacturing of green vehicles, characterized by lower fuel consumptions and CO2 emissions, is a must for the automotive industry
The modelled liquidus temperature is around 700 ◦ C when the alloy contains
The other hand, the effect on the solidus temperature is rather low, which remains faintly higher than 550 ◦ C at Zr-contents up to 0.4%
Summary
The manufacturing of green vehicles, characterized by lower fuel consumptions and CO2 emissions, is a must for the automotive industry. This can be achieved through a reduction of the vehicle weight by replacing heavier steel parts with lighter, high-strength and, at the same time, ductile aluminium alloys. Al-Mg-Si alloys (series 6xxx), in particular, can be used [1]. Some of them are used for parts that require excellent crash performance [2]. There are attempts to improve the mechanical properties of Al-Si-Mg alloys [3,4,5].
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