zichlik of sof alyuminiy (ρ=2.7g/cm3) nisbatan kichik, haqida 1/3 of 1 2f3 dir temir.
However, the strength of pure aluminum is very low, and the σb value in the annealed state is about 8kgf/mm2, so it is not suitable for structural materials. Through long-term production practices and scientific experiments, people gradually strengthened aluminum by adding alloying elements and using heat treatment methods, which resulted in a series of aluminum alloys. The alloy formed by adding certain elements can maintain the advantages of pure aluminum, such as light weight, and at the same time have higher strength, and the σb value can reach 24-60kgf/mm2 respectively. This makes its "specific strength" (the ratio of strength to specific gravity σb/ρ) better than many alloy steels, making it an ideal structural material, which is widely used in machinery manufacturing, transportation machinery, power machinery, and aviation industry. Aircraft fuselage , Skins, compressors, etc. are often made of aluminum alloy to reduce their own weight. Using aluminum alloy instead of steel plate material welding, the structure weight can be reduced by more than 50%.