6063-T5 architectural aluminum profiles must have certain mechanical properties. In other conditions are the same, its tensile strength, yield strength with the increase in content and rise. 6063 Taiwan gold reinforced phase is mainly Mg2Si phase, in the end, Mg, Si and Mg2Si amount should be taken how much good? Mg2Si phase is composed of 2 magnesium atoms with a silicon atom, magnesium's relative atomic mass of 24.3l, silicon's relative atomic mass of 28.09, therefore Mg2Si In the compound, the mass ratio of magnesium to silicon is 1.73:1.
Therefore, according to the results of the above analysis, if the magnesium-silicon content ratio is greater than 1.73, the magnesium in the alloy in addition to the formation of Mg2Si phase, there is an excess of magnesium, and vice versa, the ratio is less than 1.73, it shows that silicon in addition to the formation of Mg2Si phase, there is a surplus of silicon.
Excess magnesium is harmful to the mechanical properties of the alloy. Magnesium is generally controlled at 0.5% or so, the total amount of Mg2Si is controlled at 0.79%. When the silicon excess 0.01% of the mechanical properties of the alloy σb about 218Mpa, has greatly exceeded the national standard performance, and excess silicon from 0.01% to 0.13%, σb can be increased to 250Mpa, that is, an increase of 14.6%. To form a certain amount of Mg2Si, must first take into account the Fe and Mn and other impurities caused by the loss of silicon, that is, to ensure that there is a certain amount of excess silicon. In order to make 6063 alloy magnesium fully matched with silicon, the actual ingredients, must consciously make Mg: Si <1.73. Magnesium excess not only weaken the strengthening effect, but also increase the product cost.
Therefore, the composition of 6063 alloy is generally controlled as follows: Mg: 0.45% -0.65%; Si: 0.35% -0.50%; Mg: Si = 1.25-1.30; impurities Fe control in <0.10% -0.25%; Mn <0.10%.