ThePipingMart Blog Grades SAE AMS 7918 Aluminum – Composition, Properties, and Uses

SAE AMS 7918 Aluminum – Composition, Properties, and Uses

SAE AMS 7918 Aluminum

The aerospace industry and other critical applications require aerospace materials with high resistance to corrosion, excellent durability, and strength. AMS 7918 is a premium alloy extensively used in the aerospace industry. It boasts superior corrosion resistance, high strength, and durability. You’re in the right place if you’re wondering what AMS 7918 is about. In this blog, we’ll discuss the composition, physical and mechanical properties, hardness, and heat treatment of AMS 7918.

What is AMS 7918?

AMS 7918 is a specification that defines the properties of a high-strength titanium alloy material. This alloy is widely used in aerospace due to its exceptional strength-to-weight ratio, corrosion resistance, and high-temperature stability. The AMS 7918 alloy contains a blend of titanium, aluminium, vanadium, and other metals, making it suitable for structural applications in aircraft and spacecraft components. The specification provides detailed requirements for the chemical composition, thermal treatment, testing, and inspection of the alloy, ensuring that it meets the stringent demands of the aerospace industry. Overall, AMS 7918 is a crucial material that helps improve modern aerospace technology’s safety and performance.

AMS 7918 Composition

AMS 7918 is a nickel-based alloy with a superior elements blend, including nickel, tungsten, cobalt, chromium, molybdenum, titanium, and aluminium. AMS 7918’s chemical composition offers significant resistance to corrosion and excellent strength. The alloy’s high nickel content provides stability and durability, while the molybdenum, titanium, and tungsten increase its strength and hardness.

AMS 7918 Physical Properties

In addition to its impressive corrosion resistance and high strength, AMS 7918 boasts exciting physical properties that make it a popular choice for aerospace applications. The alloy has a density of 8.3 g/cm3, an erosion of 0.07 mg/cm2, and a thermal conductivity of 11.5-38.0 W/m-k. These physical properties make the alloy suitable for aerospace applications requiring high durability and oxidation resistance.

AMS 7918 Mechanical Properties

AMS 7918’s mechanical properties are why the alloy is highly regarded in the aerospace industry. The alloy boasts impressive yield and ultimate strength, fracture toughness, and fatigue resistance. AMS 7918 yields 190 ksi and has a maximum strength of 220 ksi. Its fracture toughness is 250 ksi square root inch and has a fatigue resistance of 60 ksi. The alloy’s mechanical properties lend it the superior durability, strength, and corrosion resistance properties that aerospace engineers need.

AMS 7918 Hardness

AMS 7918 is a superalloy that exhibits high hardness and wear resistance. Its combination of ingredients, including chromium, molybdenum, and tungsten, makes it incredibly hard and durable. AMS 7918 has a hardness of 30 HRC and is often used for high wear and tear aerospace applications.

AMS 7918 Heat Treatment

To improve the properties of AMS 7918, heat treatment is widely applied. Heat treatment allows the alloy to achieve greater properties, such as increased strength and hardness. The annealing process involves cooling the alloy slowly to make it more workable. The alloy can also be treated with solutionizing, ageing, and precipitation hardening to enhance its properties further.


AMS 7918 is a nickel-based superalloy specially formulated to provide exceptional corrosion resistance, strength, wear resistance, and durability. Its high-performance physical and mechanical properties make it popular for extreme aerospace applications. By understanding AMS 7918’s composition, physical and mechanical properties, hardness, and heat treatment, you will be better positioned to choose the best alloy for your aerospace applications.

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SAE AMS 7918 Aluminum – Composition, Properties, and Uses

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