Material Overview: The document discusses the aluminium alloy known as Duralumin, specifically the 2017A variant with a T451 temper. This alloy is recognized for its use in resistance parts due to its mechanical properties, which are comparable to low-carbon steel but with significantly less weight.

Chemical Composition: The alloy consists of various elements with specific weight percentages. Key components include Copper (Cu), Magnesium (Mg), and Aluminium (Al), with other elements like Silicon (Si), Iron (Fe), and Manganese (Mn) present in smaller amounts.

Mechanical Properties: The alloy exhibits a modulus of elasticity of 72,400 MPa, a thermal stress coefficient of 23.6 x 10^-6/K, and an electric conductivity of 20 m/Ohm.mm². It has a thermal conductivity of 134 W/m.k and a specific gravity of 2.80. The hardness is measured at 105 HB, with an elongation range of 8.4% to 14.1%.

Strength Characteristics: The limit of elasticity (Rp 0.2) ranges from 248 to 292 MPa, while the tensile strength is between 375 and 426 MPa. These properties make the alloy suitable for general mechanics, special machines, rolling stock, and public works.