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Metal elements such as vanadium, calcium, lead, tin, bismuth, antimony, beryllium, and sodium are the eight key components that determine the performance of aluminum alloys. Because of the various uses of aluminum coils and the addition of elements during processing, these impurity elements have varied melting temperatures, structures, and compounds created by aluminum, resulting in a different impact on the properties of aluminum alloys.

1. Copper elements' influence on metal elements

Copper is a key alloying element with a solid solution-strengthening effect. Furthermore, CuAl2 precipitated by aging has a considerable anti-aging effect. The copper content in aluminum plate is normally 2.5%-5%, and the strengthening effect is optimal when the copper level is 4%-6.8%, hence most hard aluminum alloys have a copper content in this range. Click here for Copper Composite Panel.

2. Metal Elements

The Influence of Silicon Al-Mg2Si Alloy Equilibrium Phase Diagram The highest solubility of Mg2Si in aluminum in the aluminum-rich section is 1.85%, and the temperature deceleration is minor. The addition of silicon to the aluminum plate in the deformed aluminum alloy is confined to welding materials, and the addition of silicon to aluminum is limited to welding materials. There is also a fair amount of fortification.

3. Magnesium's influence on metal elements

Magnesium has a considerable strengthening impact on aluminum coils. The tensile strength of the aluminum alloy coil improves by approximately 34MPa for every 1% increase in magnesium.

The strength of the aluminum coil may be increased if less than 1% manganese is added. As a result, the inclusion of manganese can reduce the magnesium concentration while also reducing the likelihood of hot cracking. Furthermore, manganese can increase the corrosion resistance and welding performance of aluminum coils by causing the Mg5Al8 compound to precipitate uniformly.

4. Manganese's influence on metal elements

Manganese has a maximum solubility in a solid solution of 1.82%. With increasing solubility, the alloy's strength gradually increases.  The elongation reaches its highest value when the manganese level in the aluminum coil is 0.8%. Al-Mn alloy is a long and short-age hardening alloy, which means that heat treatment cannot be used to strengthen it.

5. Zinc's influence on metal elements

Under the premise of deformation, the addition of zinc to aluminum alone produces a relatively limited enhancement in the strength of the aluminum alloy. At the same time, there is a risk of stress corrosion cracking, which limits its use.

6. Iron and silicon's influence on metal elements

In Al-Cu-Mg-Ni-Fe series wrought aluminum alloys, iron is used as an alloying element, while silicon is used in Al-Mg-Si series wrought aluminum alloys, Al-Si series electrodes, and aluminum-silicon forged alloys. Silicon and iron are typical impurities in aluminum alloys, and they have a substantial impact on the alloy's characteristics.

They are mostly found as FeCl3 and free silicon. When the silicon exceeds the iron, the -FeSiAl3 (or Fe2Si2Al9) phase forms, and when the iron exceeds the silicon, the -Fe2SiAl8 (or Fe3Si2Al12) phase forms. Cracks in the casting will occur if the iron and silicon proportions are not correct, and if the iron percentage in cast aluminum is too high, the casting will be more fragile.

7. Titanium and boron's influence on metal elements

Titanium is also a common additive element in aluminum alloys, where it is added as an Al-Ti or Al-Ti-B master alloy. Titanium and aluminum combine to generate the TiAl2 phase, which crystallizes into the non-spontaneous core and aids in the refinement of the forging and weld structures.

When the Al-Ti alloy creates a package reaction, the critical titanium level is around 0.15%, and if boron is present, it is lowered to around 0.01%.

8. The influence of chromium and strontium on metal elements

In the aluminum plate, chromium forms intermetallic compounds such as (CrFe)Al7 and (Crum)Al12, which inhibits the nucleation and growth process of recrystallization, has a certain strengthening effect on the alloy, and can also improve the toughness of the alloy and reduce the sensitivity of stress erosion cracking.

However, it will increase the quenching sensitivity and turn the anodized film yellow. The quantity of chromium added to aluminum alloys is typically less than 0.35%, and it decreases as the amount of transition elements in the alloy increases. Strontium is added to aluminum alloys for extrusion at a rate of 0.015%. %0.03% strontium, the -AlFeSi in the ingot will convert into -AlFeSi, reducing the ingot's average time by 60%70%. It can increase aluminum coil mechanical characteristics, plasticity, and processability, as well as the surface roughness of aluminum alloy products.

Adding 0.02%0.07% strontium element to high-silicon (10%13%) deformed aluminum alloy can minimize the primary crystal to a minimum while also greatly improving mechanical function. Tensile strength b rose from 233MPa to 236MPa, yield strength 0.2 rose from 204MPa to 210MPa, and elongation 5 rose from 9% to 12%.

Adding strontium to an Al-Si alloy can minimize the size of primary silicon particles, increase the plasticity and processing performance of aluminum coils, and allow aluminum coils to be processed more smoothly for hot and cold rolling.