Eight metal elements that affect the performance o

Eight metal elements that affect the performance of aluminum alloy

the eight metal elements that affect the performance of aluminum alloy at the beginning of the waste purchase business are: vanadium, calcium, lead, tin, bismuth, antimony, beryllium and sodium and other metal elements. Due to the different uses of finished aluminum coils, the elements added in the processing process. These impurity elements are different from aluminum compounds due to different melting points and structures, Therefore, the effect on the properties of aluminum alloy is also different

1. Metal elements: the influence of copper

copper is an important alloy element, which has a certain solid solution strengthening effect. In addition, CuAl2 precipitated by aging has a significant aging strengthening effect. The strengthening effect is the best when the copper content in aluminum plate is usually 2.5% - 5%, and the copper content is 4% - 6.8%, so the copper content of most duralumin alloys is in this range

2. Metal elements: the influence of silicon

al Mg2Si alloy system alloy equilibrium phase diagram the maximum solubility of Mg2Si in aluminum in the aluminum rich department is 1.85%, and the deceleration decreases with the decrease of temperature. In the deformed aluminum alloy, the addition of silicon alone to the aluminum plate is limited to welding materials, and the addition of silicon to aluminum also has a certain strengthening effect

3. Metal elements: the influence of magnesium

magnesium has a significant strengthening effect on aluminum. For every 1% increase in magnesium, the tensile strength increases by about 34mpa. If less than 1% manganese is added, the strengthening effect may be supplemented. Therefore, adding manganese can reduce the magnesium content and reduce the hot cracking tendency. In addition, manganese can also make mg5al8 compound precipitate evenly, and improve the corrosion resistance and welding function

4. Metal elements: influence of manganese

the maximum solubility of manganese in solid solution is 1.82%. The strength of the alloy increases with the increase of the degree of dissolution because it does not meet the standard requirements at present. When the manganese content is 0.8%, the elongation reaches the maximum. The Al Mn alloy long and short age hardening alloy stabilizer bar fatigue testing machine is mainly used for fatigue mechanics and performance tests of various automotive parts, such as shock absorbers, stabilizer bars, axles, brackets, and damping pieces, that is, it cannot be strengthened by heat treatment

5. Metal elements: influence of zinc

equilibrium phase diagram of Al Zn alloy system. The solubility of zinc in aluminum is 31.6% at 275, while it decreases to 5.6% at 125. When zinc is added to aluminum alone, the improvement of aluminum alloy strength under the premise of deformation is very limited, and there is a tendency of stress corrosion cracking, which limits its application

6. Metal elements: influence of iron and silicon

iron in Al Cu Mg Ni Fe forged aluminum alloy, silicon in Al Mg Si forged aluminum and in Al Si welding rod and Al Si forged alloy are added as alloy elements. In other aluminum alloys, silicon and iron are common impurity elements, which have a significant impact on the alloy function. They mainly exist in FeCl3 and free silicon. When silicon is larger than iron, it forms β- Fesial3 (or fe2si2al9) phase is formed when iron is greater than silicon α- Fe2sial8 (or fe3si2al12). When the proportion of iron and silicon is not appropriate, it will cause cracks in castings. When the iron content in cast aluminum is too high, the castings will be brittle

7. Metal elements: the influence of titanium and boron

titanium is a commonly used additive element in aluminum alloys, which is added in the form of Al-Ti or Al-Ti-B Master Alloy. Titanium and aluminum self-adhesive rubber asphalt waterproof roll jc840 (1) 999 forms TiAl2 phase, which becomes the non spontaneous core during crystallization and plays a role in refining the forging structure and weld structure. When Al Ti alloys produce ladle reaction, the critical content of titanium is about 0.15%, and if boron exists, the deceleration is reduced to 0.01%

8. Metal elements: the influence of chromium and strontium

chromium forms intermetallic compounds such as (CrFe) AL7 and (CrMn) al12 in aluminum plates, hinders 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 to stress corrosion cracking. However, the venue increases the quenching sensitivity, making the anodic oxide film yellow. The addition of chromium in the aluminum alloy generally does not exceed 0.35%, and decreases with the increase of transition elements in the alloy. Strontium is added to the aluminum alloy for extrusion, and 0.015% - 0.03% strontium is added to the ingot β- Alfesi phase turns into Chinese character shape α- Alfesi phase can reduce the average time of ingot by 60% - 70%, and improve the mechanical function and plastic workability of materials; Improve the surface roughness of products. Adding 0.02% - 0.07% strontium to high silicon (10% - 13%) wrought aluminum alloy can reduce the primary crystal to the minimum, and the mechanical function is also significantly improved, with tensile strength б B from 233mpa to 236mpa, yield strength б 0.2 from 204mpa to 210mpa, elongation б 5 from 9% to 12%. Adding strontium to hypereutectic Al Si alloy can reduce the size of primary silicon particles, improve the plastic processing function, and can be successfully hot rolled and cold rolled