ThePipingMart Blog Grades AMS 4109 Aluminum Alloy – Composition, Properties and Uses

AMS 4109 Aluminum Alloy – Composition, Properties and Uses

AMS 4109

It can be overwhelming to navigate the world of materials, but we are here to help. This blog post will focus on AMS4109, a widely used material in the aerospace industry. From its composition to its mechanical properties, we will cover everything you need to know about AMS 4109.

What is AMS 4109?

AMS 4109 (also known as 7175 Aluminum Alloy) is a specification for titanium alloy bars, wire, and forgings used in aerospace applications. This standard contains specific requirements for these materials’ chemical composition, mechanical properties, and nondestructive testing. Ensuring proper material selection is crucial for the success and safety of aerospace operations. With AMS4109, aerospace engineers can have confidence that the titanium used in their designs meets stringent quality requirements, ultimately leading to reliable aircraft and spacecraft performance.

AMS 4109 Composition

AMS 4109 is a low-carbon steel alloy comprising approximately 0.20% carbon, 0.35% manganese, 0.75% nickel, and 0.20% molybdenum. It also contains trace amounts of other elements like phosphorus and sulfur that enhance its properties. Its composition is carefully crafted to provide excellent strength and toughness, making it a popular choice for aerospace parts.

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

AMS 4109 Physical Properties

AMS 4109 has a density of 7.86 g/cm3 and a melting point of approximately 1493°C. Its thermal conductivity is 43.8 W/mK, and its electrical conductivity is 8.18 × 10^6 S/m. The coefficient of thermal expansion of AMS 4109 is 11.7 × 10^-6/°C. It exhibits good corrosion resistance, ideal for parts that withstand harsh environments.

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

AMS 4109 Mechanical Properties

AMS 4109 has excellent mechanical properties that make it suitable for high-stress applications. It has a tensile strength ranging from 870-1000 MPa and yield strength of 620 MPa. The elongation at break is approximately 12%, and the reduction in area is 35%. Its toughness at sub-zero temperatures is also impressive, making it ideal for aerospace applications.

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

AMS 4109 Uses

AMS 4109 is typically used to produce aerospace components such as landing gear, structural parts, and hydraulic tubing. Its ability to withstand high-stress applications makes it an ideal material for parts that are subjected to excessive wear and tear. It’s corrosion resistance and toughness also make it ideal for parts that need to function in harsh environments.

AMS 4109 Hardness

The hardness of AMS 4109 depends on the heat treatment it undergoes. When the material is in an annealed state, it has a hardness of 197 Brinell. However, when it undergoes a quench and temper treatment, its hardness increases to 285-341 Brinell. The hardness level can be adjusted to suit specific requirements, making AMS 4109 versatile for different applications.

AMS 4109 Heat treatment

AMS 4109 is a heat-treatable alloy that can be hardened by oil or water quenching. After quenching, it is tempered at 540-595°C to achieve the desired properties. AMS 4109 can also be normalized, heating the material to 925°C, followed by air cooling. The heat treatment process is critical in determining the material’s strength and toughness, making it crucial for parts subjected to high-stress applications.


AMS 4109 material is a low-carbon steel alloy widely used in the aerospace industry. Its strength, toughness, and corrosion resistance are ideal for parts subjected to harsh environments and high-stress applications. Its physical and mechanical properties and ability to undergo heat treatment make it a versatile material for different aerospace components. Whether you are designing landing gear or structural parts, AMS 4109 is a reliable material that will meet your requirements.

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