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Manufacturing process of aluminum-magnesium-silicon alloy The present invention relates to a high-strength aluminum-magnesium-silicon alloy, and more particularly to the technical area of improving the strength, hardness and fatigue resistance of an alloy product by adjusting the composition of trace elements of an alloy material and processing the alloy material with hot forging and heat treatment. Figure 1 : A flow chart of manufacturing a high-strength aluminum-magnesium-silicon alloy of the present invention In the aforementioned alloys, the AA6XXX series alloys can achieve a precipitation strengthening effect by adding a trace amount of magnesium (Mg) and silicon (Si) elements. The strength of the AA6xxx series alloys is moderate among these alloys, but the formability, acid
resistance, weldability, and anodic treatment effect are very good, so that the AA6XXX series alloys are used extensively by manufacturers, and the common ones include the AA6053, AA6061, AA6063 and AA6151 alloys. With reference to FIGS. 10 and 11 , the AA6061 alloy generally has a chemical composition including 0.579 wt.% silicon (Si), 0.62 wt.% iron (Fe). 0.261 wt.% copper (Cu), 0.103 wt.% manganese (Mn), 1.024 wt.% magnesium (Mg), etc., and the Aluminum 6061 alloy ingot has grains with an average size or diameter of 125 um (as shown in FIG. 12). Although the strength of the AA6061 alloy is incomparable with the strength of the AA2XXX series alloys and the AA7XXX series alloys, and the Aluminum 6061 alloy has better manufacturability, formability, weldability and corrosion resistance, and its extrusion speed is three to four times of the extrusion speed of the AA5056 alloy. Therefore, the alloy forging cost of the AA6061 alloy is lower than the alloy forging cost of the AA2XXX series alloys and the AA7xxx series alloys. In addition, the AA6061 alloy processed by T6 heat treatment can obtain excellent mechanical properties including a yield strength up to 275 MPa, an ultimate strength up to 310 MPa, a Brinell hardness of 95 HBW, and a fatigue strength of approximately 96.5 MPa, etc. Since the construction material of the AA6061 alloy is lighter than the foregoing ones, therefore the AA6061 can be applied extensively in key components of means of transportation Such as bicycles, cars, ships and airplanes. As the ultimate strength, hardness and fatigue resistance are important mechanical properties of a construction material, how to obtain the best mechanical properties of an aluminum-magnesium silicon alloy in whatever condition is a Subject worth researching. For instance, a high strength Al-Mg-Si alloy as disclosed in U.S. Pat. No. 5,571, achieves the effect of increasing the ultimate strength and the yield strength of an alloy material up to 434 MPa and 379 MPa respectively by changing the composition of the mate rial, adding more magnesium (Mg) and silicon (Si) elements in melting aluminum ingots, and producing solid solution and aging strengthening effects by T6 heat treatment. Since beryllium (Be) and its compound have a relatively greater toxicity and a relatively higher risk in melting, therefore the present invention eliminates the addition of beryllium (Be). Further, an aluminum alloy having improved damage tolerant characteristics as disclosed in U.S. Pat. No. 5,888, achieves the effect of increasing the ultimate strength and the yield strength of an alloy material up to 403 MPa and 367 MPa respectively by changing the composition of the material, adding
Copper ( Cu ) 0. Manganese ( Mn ) 0. Chromium ( Cr ) 0. Zinc ( Zn ) 0. Titanium ( Ti ) 0. Boron ( B ) 0. Aluminum ( Al ) Rem. Table 1: The composition of Aluminum 6061 Alloy Mechanical properties of heat treatment
Reference September 19, 2018, Encyclopædia Britannica, inc. Aluminum processing https://www.britannica.com/technology/aluminum-processing https://www.gabrian.com/6061-aluminum-properties/
