The chemical composition of optimal control
6063 - T5 architectural aluminum profile must possess certain mechanical properties. Other conditions being the same, the tensile strength, yield strength increased with the increase of content. 6063 alloy aluminium profiles strengthening phase is mainly Mg2Si phase, exactly the amount of Mg, Si and Mg2Si should take much for good? Magnesium Mg2Si phase is made up of two atoms with a silicon atoms, magnesium relative atomic mass is 24.3 l, relative atomic mass of silicon is 28.09, so the Mg2Si compounds, the quality of magnesium, silicon ratio was 1.73:1.
Therefore, according to the above analysis result, if the content of magnesium, silicon ratio greater than 1.73, the magnesium alloy in in addition to the formation of Mg2Si phase, there is excess magnesium, whereas the ratio is less than 1.73, suggests that silicon in addition to the formation of Mg2Si phase, and the rest of the silicon.
Magnesium excess is harmful to alloy mechanical properties. Mg2Si magnesium general control in 0.5%, and total amount control in 0.79%. When excess 0.01% silicon alloy mechanical properties of sigma b is about 218 mpa, performance has been far more than the national standard, and the surplus silicon increased from 0.01% to 0.01%, sigma b can be increased to 250 mpa, which increased by 14.6%. To form a certain amount of Mg2Si, must first consider the impurities such as Fe and Mn content of silicon loss, that is to ensure that have a certain amount of surplus silicon. In order to make the 6063 aluminium extrusion profiles magnesium alloy in the full matching with silicon, the actual ingredients, must consciously make Mg: Si < 1.73. Magnesium surplus not only weaken the strengthening effect, and increase the product cost.
As a result, the composition of 6063 alloy extruded aluminium profiles general control for: Mg: 0.45% to 0.65%. Si: 0.35% to 0.50%. Mg: Si = 1.25 1.30; Fe impurity control in < 0.10% to 0.25%. Mn < 0.10%.