Abstract
The scope of this research is to compare the grain morphology and hardness of aluminum alloy 6061 samples in three conditions: fully rolled (full hard), partially annealed (half hard), and fully annealed (soft). It is found that cold rolling produced elongated grains, parallel to the rolling direction, and the highest degree of grain-elongation is found as a band in the center of the specimens. Shearing effects of cold rolling the buckled surface produced equiaxed grains near the rolling surfaces, and may have played a role in reducing the effect of string forming solutes near the said surfaces. Higher percent reduction performed in one stage of cold rolling produced a higher increase in tensile strength and a more significant decrease in ductility. Annealing produced the softest material.
Highlights
The 6xxx series aluminum alloys are heat-treatable wrought alloys with magnesium and silicon as the primary alloying elements
Higher percent reduction performed in one stage of cold rolling produced a higher increase in tensile strength and a more significant decrease in ductility
Alloys of this series are characterized by good formability, weldability, machinability, and corrosion resistance, and moderately high strength [1]-[3]. The basis for their strength is the formation of magnesium silicide (Mg2Si), which forms if the elements are present in the proportions of 1.73:1 (Mg to Si) [4]. 6xxx series alloys are often used for structural applications since they have a medium strength and good weatherability
Summary
The 6xxx series aluminum alloys are heat-treatable wrought alloys with magnesium and silicon as the primary alloying elements Alloys of this series are characterized by good formability, weldability, machinability, and corrosion resistance, and moderately high strength [1]-[3]. The basis for their strength is the formation of magnesium silicide (Mg2Si), which forms if the elements are present in the proportions of 1.73:1 (Mg to Si) [4]. Despite the fact that the common strengthening mechanism employed for this alloy is age hardening, the scope of this project was to compare the grain morphology and hardness of samples in three conditions: fully rolled (full hard), partially annealed (half hard), and fully annealed (soft). The samples were prepared by cold rolling and appropriate annealing heat treatments
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