ThePipingMart Blog Grades AMS 4251 Aluminum Alloy – Composition, Properties and Uses

AMS 4251 Aluminum Alloy – Composition, Properties and Uses

AMS 4251

AMS 4251 is an aerospace-grade titanium alloy widely used in the aviation industry. It is known for its excellent physical and mechanical properties, ideal for high-performance applications. In this blog post, we will take a closer look at the composition, physical and mechanical properties of AMS 4251. We will also explore its various uses and discuss how it can be heat treated to enhance its hardness.

What is AMS 4251?

Have you heard about AMS 4251? It’s not a term commonly thrown around, but it’s worth knowing if you’re in the aerospace industry. AMS 4251 is a type of aluminium alloy that’s specifically designed for use in aircraft parts. This alloy has been carefully engineered to provide a high level of strength and durability while also being lightweight and able to withstand high temperatures. AMS4251 is often used in critical aircraft components, such as engine mounts, wing skins, and fuselage frames. So whether you’re an engineer or an aviation enthusiast, knowing about AMS4251 can give you a deeper appreciation for the incredible technology utilized in modern aircraft.

AMS 4251 Composition

AMS 4251 is a titanium alloy that contains 6% aluminium, 2% tin, 4% zirconium, 2% molybdenum, and 2% chromium. It also has trace amounts of iron, oxygen, carbon, hydrogen, and nitrogen. The alloy is known for its high strength and toughness and excellent resistance to corrosion and fatigue.

AMS 4251 Physical Properties

AMS 4251 has a density of 4.51 g/cm3, a melting point of 1600°C, and a thermal conductivity of 7.9 W/mK. It is non-magnetic and has a modulus of elasticity of 118 GPa. The alloy is also notable for its low thermal expansion coefficient, which makes it ideal for high-temperature applications.

AMS 4251 Mechanical Properties

AMS 4251 has a tensile strength of 1300 MPa and a yield strength of 1200 MPa. It has an elongation of 8% and a reduction of area of 20%. The alloy is also known for its excellent fatigue resistance and fracture toughness, making it ideal for aerospace applications that require high performance and reliability.

AMS 4251 Uses

Uses of AMS 4251 – AMS 4251 is commonly used in the aerospace industry for components such as turbine blades, compressor discs, and fan blades. It is also used in military applications, where its high strength and toughness make it suitable for use in combat aircraft. Additionally, the alloy is used in biomedical implants due to its excellent biocompatibility and corrosion resistance.

AMS 4251 Hardness

AMS 4251 can be heat treated to enhance its hardness. The alloy can be solution treated at 925°C for 30 minutes, followed by air cooling, and then aged at 620°C for 8 hours. This heat treatment process can increase the hardness of the alloy by up to 30%, making it even more suitable for high-performance applications.


In summary, AMS 4251 is an aerospace-grade titanium alloy with exceptional physical and mechanical properties. This blog post discusses its composition, physical and mechanical properties, and uses in detail. AMS 4251 is a versatile material with aerospace, military, and biomedical applications. Its ability to be heat treated to enhance its hardness makes it even more attractive for high-performance applications.

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