ThePipingMart Blog Grades AMS 4179 Aluminum Alloy – Composition, Properties and Uses

AMS 4179 Aluminum Alloy – Composition, Properties and Uses

AMS 4179

In engineering, the aerospace industry demands more than the best product materials. One such material that has gained recent recognition in the field is AMS 4179. It is a high-strength, corrosion-resistant alloy extensively used in the aerospace industry. In this blog, we will dive into the comprehensive details of AMS 4179, highlighting its composition, physical and mechanical properties, uses, hardness, and heat treatment methods.

What is AMS 4179?

AMS 4179 (also known as 7175 Aluminum Alloy) is an essential standard in the aerospace industry used to determine the suitability of materials for use in aircraft. Designed to ensure quality and safety, this specification outlines the strict requirements manufacturers of metallic alloys, and other aerospace materials must meet. If a material meets the standards set by AMS 4179, it can be used confidently in constructing aircraft, engines, and other critical systems. By establishing clear guidelines for testing and evaluating materials, AMS 4179 helps ensure the reliability and performance of aerospace components, ultimately making air travel safer for everyone.

AMS 4179 Composition

AMS 4179 is an aluminium alloy primarily composed of copper, magnesium, silicon, and zinc. The chemical composition of AMS 4179 makes it ideal for aerospace engineering due to its high strength-to-weight ratio. The alloy contains less than 1% iron, titanium, and manganese. The balance is mainly aluminium.

Element Content (%)
Aluminum, Al 90.0
Zinc, Zn 5.6
Magnesium, Mg 2.5
Copper, Cu 1.6
Chromium, Cr 0.23

AMS 4179 Physical Properties

Regarding physical properties, AMS 4179 is a lightweight alloy that offers excellent resistance to corrosion, making it a desirable choice for aerospace applications. Its low density, high modulus of elasticity, and high strength-to-weight ratio make it one of the most preferred materials in the aerospace industry.

Properties Metric Imperial
Density 2.6-2.8 g/cm³ 0.0939-0.1011 lb/in³
Melting point 482°C 900°F

AMS 4179 Mechanical Properties

AMS 4179 offers exceptional mechanical properties, making it suitable for critical components such as aeroplane wings, fuselage, and landing gear. The elongation and tensile strength of the alloy are 9% and 603 MPa, respectively. The alloy also exhibits excellent fatigue resistance, enabling it to withstand high-stress loads.

Properties Metric Imperial
Elastic modulus 70-80 Gpa 10152-11603 ksi
Poisson’s ratio 0.33 0.33

AMS 4179 Uses

AMS 4179 is a versatile alloy used in various aerospace applications. It is commonly used to manufacture aerostructure components such as wings, fuselage, and landing gear. It is also used in engine components such as cylinder heads, engine mounts, and fan blades.

AMS 4179 Hardness

AMS 4179 is a high-strength alloy that offers excellent hardness properties. Its hardness properties are affected by its heat treatment process. In its annealed condition, the alloy has a hardness level of 65 HB. After the T6 heat treatment process, its hardness increases to 120 HB.

AMS 4179 Heat treatment

The heat treatment process of AMS 4179 plays a crucial role in enhancing its mechanical properties. The T6 heat treatment process involves heating the alloy to 540 °C-580 °C, then quenching it in cold water or below its critical temperature. The alloy is then aged at 170 °C for up to 8 hours. The T6 heat treatment process enhances the alloy’s strength, hardness, and fatigue resistance, making it ideal for critical aerospace applications.


In conclusion, AMS 4179 is an essential aerospace material with excellent mechanical and physical properties. Its composition, primarily composed of aluminium, copper, magnesium, silicon, and zinc, makes it ideal for use in aerostructure and engine components. Its high strength-to-weight ratio, corrosion resistance, and ability to withstand high-stress loads make it an exceptional choice for aerospace engineers. With the right heat treatment process, AMS 4179 can be transformed into a high-performance alloy that can withstand harsh environmental conditions. As the aerospace industry evolves, AMS 4179 will remain vital in various applications.

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