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 AMS 4182 Aluminum Alloy – Composition, Properties, and Uses

 AMS 4182

Every material designed for engineering applications must meet specific standards, including the Aerospace Material Specification (AMS). Among the many AMSs, the AMS 4182 stands out because of its excellent mechanical and physical properties. But what exactly is AMS 4182? This article will explore the composition, physical and mechanical properties, uses, hardness, and heat treatment of AMS 4182.

What is AMS 4182?

AMS 4182, also known as the Aluminum Alloy, Extruded Profiles, 6.2Zn – 2.3Cu – 2.2Mg – 0.12Zr, Solution Heat Treated, Stress Relieved by Stretching, is a specification created by the Aerospace Materials Specification committee. This specification outlines the requirements for aluminium alloy extruded profiles used in producing aircraft parts that undergo significant amounts of stress. The 6.2Zn – 2.3Cu – 2.2Mg – 0.12Zr mixture provides excellent strength and fatigue resistance, making it an ideal material for aerospace applications. Engineers and manufacturers who work on aerospace components must follow the guidelines outlined in AMS 4182 to ensure their products are up to par with industry standards.

AMS 4182 Composition

AMS 4182 is a high-strength aluminium alloy primarily composed of aluminium (95.8 to 96.8%), magnesium (4.4 to 5.2%), and manganese (0.1 to 0.35%). Combining these elements leads to fabricating a high-strength material and excellent corrosion resistance.

AMS 4182 Physical Properties

AMS 4182 is a lightweight material with a density of 2.79 g/cc. It has a melting point of 595°C and a thermal conductivity of 140-150 W/m-K. The alloy’s electrical conductivity is 34-38% IACS, and its coefficient of thermal expansion is 23.4 x 10^-6 /°C. The material also has a low coefficient of friction, making it ideal for use in bearing applications.

AMS 4182 Mechanical Properties

AMS 4182 is a high-strength aluminium alloy with excellent mechanical properties. It has a tensile strength of 425-470 MPa, a yield strength of 307-324 MPa, and an elongation of 5-7%. The alloy’s fatigue strength is also impressive, making it suitable for aerospace applications where materials must withstand repeated loading and unloading cycles.

AMS 4182 Uses

AMS 4182 is widely used in the aerospace industry to manufacture complex parts that require high strength, low weight, and excellent fatigue resistance. The alloy is popular for aircraft skins, fuselage frames, propeller blades, and helicopter rotor blades. It is also used in the construction of high-performance boats and yachts.

AMS 4182 Hardness

AMS 4182 has a hardness of 90-110 Brinell, making it a relatively soft material. However, the alloy can be hardened through heat treatment, which increases its tensile and yield strength while maintaining excellent fatigue resistance.

AMS 4182 Heat treatment

AMS 4182 can be heat-treated to improve its mechanical properties. The T6 tempering process involves heating the material to around 500°C for several hours, followed by quenching in water. This process creates a material with a tensile strength of over 500 MPa and a yield strength of over 450 MPa, making it suitable for high-performance aerospace applications.


AMS 4182 is a high-strength aluminium alloy that has become a popular material in the aerospace industry. Its excellent mechanical and physical properties and lightweight nature make it ideal for use in aircraft components such as skins, frames, and rotor blades. Knowing the composition, physical and mechanical properties, uses, hardness and heat treatment of AMS 4182 can help engineers make informed decisions about its use in various applications.

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 AMS 4182 Aluminum Alloy – Composition, Properties, and Uses

by harsh jain time to read: 2 min