2024 aluminium alloy 2024 aluminium alloy aluminium alloy, with copper as the primary alloying element. It is used in applications requiring high strength to weight ratio , as well as good fatigue resistance. It is weldable only through friction welding , and has average machinability . Due to poor corrosion resistance , it is often clad with aluminium or Al-1Zn for protection , although this may reduce the fatigue strength . In older systems of terminology, 2XXX series alloys were known as duralumin , and this alloy was named 24ST.Alsheet and plate forms. It is not commonly forged.Basic properties Aluminium alloy 2024 has a density of 2.78 g/cm³, electrical conductivity of 30% IACS, Young's Modulus of 73 GPa across all tempers, and begins to melt at.composition roughly includes 4.3-4.5% copper, 0.5-0.6% manganese , 1.3-1.5% magnesium and less than a half a percent of silicon, zinc, nickel, chromium, lead and bismuth.Chemical composition The alloy composition of 2024 is: Silicon no minimum, maximum 0.5% by weight Iron no minimum, maximum 0.5% Copper minimum 3.8%, maximum 4.9% Manganese minimum 0.3, maximum 0.9% Magnesium minimum 1.2%, maximum 1.8% Chromium no minimum, maximum 0.1% Zinc no minimum, maximum 0.25% Titanium no minimum, maximum 0.15% Other elements no more than 0.05% each, 0.15% total Remainder aluminum Mechanical properties mechanical properties of 2024 depend greatly on the temper of the material .2024-O 2024-O temper aluminium has no heat treating . It has an ultimate tensile strength of, and maximum yield strength of no more than. The material has elongation of 10-25%, this is the allowable range per applicable AMS specifications.2024-T3 T3 temper 2024 sheet has an ultimate tensile strength of and yield strength of at least. It has an elongation of 10-15%.2024-T4 Solution treated and naturally aged.2024-T5 Cooled from hot working and artificially aged2024-T351 T351 temper 2024 plate has an ultimate tensile strength of and yield strength of. It has elongation of 20%.Uses Due to its high strength and fatigue resistance, 2024 is widely used in aircraft , especially wing and fuselage structures under tension. Additionally, since the material is susceptible to thermal shock , 2024 is used in qualification of liquid penetrant tests outside of normal temperature ranges .
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