ThePipingMart Blog Grades AMS 4044 Aluminum Alloy – Composition, Properties and Uses

AMS 4044 Aluminum Alloy – Composition, Properties and Uses

AMS 4044

AMS 4044 is a high-strength aluminium alloy commonly used in aircraft structures and other high-stress applications. Its popularity stems from its excellent mechanical and physical properties and corrosion resistance in harsh environments. In this blog post, we’ll explore the composition of AMS 4044, its physical and mechanical properties, and how it is used in various industries.

What is AMS 4044?

AMS 4044 (Aluminium 7075) is an aluminium alloy sheet and plate specification. This specification outlines the requirements for aluminium alloy materials used in aerospace and other high-stress applications. The alloys specified in AMS 4044 are known for their strength, durability, and resistance to corrosion. By adhering to the guidelines in AMS 4044, manufacturers can ensure that their aluminium alloy products meet the strict quality and performance standards required for these demanding applications. Whether for an aircraft fuselage, a spacecraft component, or a high-performance racing engine, AMS 4044 assures that the aluminium alloy material will deliver the necessary performance and reliability.

What Form Is AMS 4044 Available at Piping Mart?

  • Pipes
  • Tubing

AMS 4044 Composition

AMS 4044 is an aluminium alloy that contains magnesium and silicon as its primary alloying elements. It also contains small amounts of copper, zinc, iron, titanium, and manganese. The exact composition of AMS 4044 varies depending on the manufacturer and application. This alloy is typically supplied as extruded, forged, or rolled products.

Component Elements Properties Metric English Comments
Aluminum, Al 87.1 – 91.4 % 87.1 – 91.4 % As remainder
Chromium, Cr 0.18 – 0.28 % 0.18 – 0.28 %
Copper, Cu 1.2 – 2.0 % 1.2 – 2.0 %
Iron, Fe <= 0.50 % <= 0.50 %
Magnesium, Mg 2.1 – 2.9 % 2.1 – 2.9 %
Manganese, Mn <= 0.30 % <= 0.30 %
Other, each <= 0.05 % <= 0.05 %
Other, total <= 0.15 % <= 0.15 %
Silicon, Si <= 0.40 % <= 0.40 %
Titanium, Ti <= 0.20 % <= 0.20 %
Zinc, Zn 5.1 – 6.1 % 5.1 – 6.1 %

AMS 4044 Physical Properties

AMS 4044 has a density of 2.77 g/cm3, lower than steels. This makes it an attractive choice for lightweight applications. Its melting point is 549°C, and its thermal conductivity is 129 W/m·K. It has a coefficient of thermal expansion of 23.2 µm/m·K, which means it expands quite a bit when exposed to heat. It also has good electrical conductivity of 43.6% IACS.

Physical Properties Metric English Comments
Density 2.81 g/cc 0.102 lb/in³ AA; Typical

AMS 4044 Mechanical Properties

One of the critical advantages of AMS 4044 is its high strength-to-weight ratio. It has a tensile strength of 490 MPa and a yield strength of 390 MPa. It also has a high fatigue strength and excellent resistance to stress corrosion cracking. These properties make AMS 4044 an ideal choice for applications that require high strength and durability, such as aircraft components, truck frames, and marine equipment.

AMS 4044 Thermal Properties

Thermal Properties Metric English Comments
CTE, linear 21.6 µm/m-°C
@Temperature -50.0 – 20.0 °C
12.0 µin/in-°F
@Temperature -58.0 – 68.0 °F
23.4 µm/m-°C
@Temperature 20.0 – 100 °C
13.0 µin/in-°F
@Temperature 68.0 – 212 °F
23.6 µm/m-°C
@Temperature 20.0 – 100 °C
13.1 µin/in-°F
@Temperature 68.0 – 212 °F
AA; Typical; average over range
24.3 µm/m-°C
@Temperature 20.0 – 200 °C
13.5 µin/in-°F
@Temperature 68.0 – 392 °F
25.2 µm/m-°C
@Temperature 20.0 – 300 °C
14.0 µin/in-°F
@Temperature 68.0 – 572 °F
Specific Heat Capacity 0.960 J/g-°C 0.229 BTU/lb-°F
Thermal Conductivity 130 W/m-K 900 BTU-in/hr-ft²-°F AA; Typical at 77°F
Melting Point 477 – 635.0 °C 890 – 1175 °F AA; Typical range based on typical composition for wrought products >= 1/4 in. thickness. Homogenization may raise the eutectic melting temperature by 20-40°F but usually does not eliminate it.
Solidus 477 °C 890 °F AA; Typical
Liquidus 635.0 °C 1175 °F AA; Typical

AMS 4044 Uses

AMS 4044 is commonly used in aerospace for aircraft skin, frames, and other structural applications. It is also used in the marine industry for boat hulls and other components that require high strength and corrosion resistance. Other applications include truck frames, bicycle frames, and sporting equipment. Its excellent properties suit harsh environments, such as saltwater or extreme temperatures.

AMS 4044 Hardness

AMS 4044 has a hardness of 140-180 Brinell, comparable to other high-strength aluminium alloys. This hardness can be increased through cold working or heat treatment. However, it should be noted that excessive hard work can reduce the alloy’s ductility.

AMS 4044 Heat Treatment

AMS 4044 can be heat treated to improve its properties. This involves heating the alloy to a specific temperature and then quenching it to achieve the desired hardness and strength. Heat treatment can also enhance the alloy’s resistance to stress corrosion cracking. However, heat treatment should be carried out carefully to avoid distortion or cracking of the product.


AMS 4044 material is a high-strength aluminium alloy widely used in various industries for its excellent mechanical and physical properties. Its composition, physical and mechanical properties, and applications make it an attractive choice for lightweight, high-stress applications. Proper heat treatment can further enhance its properties, but care must be taken to avoid distortion or cracking. Overall, AMS 4044 is a dependable and versatile material that continues to find new applications in the modern world.

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