ThePipingMart Blog Grades AMS 4145 Aluminum Alloy – Composition, Properties and Uses

AMS 4145 Aluminum Alloy – Composition, Properties and Uses

AMS 4145

When it comes to material selection for engineering applications, choosing the right alloy can make all the difference in performance and durability. One such alloy widely used in the aerospace and aircraft industries is AMS4145. But what exactly is AMS 4145? This blog post will investigate its composition, properties, uses, and more!

What is AMS 4145?

You’ve come to the right place if you’re curious about AMS 4145. AMS 4145 refers to a specification for high-quality aluminium alloy material used to manufacture aircraft parts. This specification provides a detailed list of requirements that must be met for the material to be considered suitable for aerospace applications. It covers everything from chemical composition and heat treatment to physical and mechanical properties. By adhering to these standards, manufacturers can ensure that their products are safe, reliable, and capable of withstand extreme conditions at high altitudes. So the next time you board a plane, you can feel confident knowing that the parts holding it together are made from the best possible materials.

What form is AMS 4145 Available at Piping Mart?

  • Alloy Steel AISI 4145 Bars

AMS 4145 Composition

AMS 4145 is a high-strength aluminium alloy of mostly aluminium, with small amounts of copper, magnesium, iron, and other trace elements. This alloy is known for its excellent corrosion resistance, which makes it a popular choice in the aerospace industry. It also has high toughness and fatigue strength, which makes it suitable for high-stress applications.

Element Content (%)
Aluminum, Al 83 – 87.4
Silicon, Si 9.3 – 10.7
Copper, Cu 3.3 – 4.7
Iron, Fe ≤ 0.80
Zinc, Zn ≤ 0.20
Magnesium, Mg ≤ 0.15
Chromium, Cr ≤ 0.15
Manganese, Mn ≤ 0.15
Beryllium, Be ≤ 0.00080
Remainder (each) ≤ 0.050
Remainder (total) ≤ 0.15

AMS 4145 Physical Properties

AMS 4145 has a density of 2.69 g/cm3, which is relatively low for a high-strength alloy. It also has a melting point of 555°C and a thermal conductivity of 138 W/mK. The coefficient of thermal expansion of AMS 4145 is 23.2 µm/m°C, which means that it expands considerably when exposed to heat.

Properties Metric Imperial
Density 2.74 g/cm3 0.0990 lb/in3
Melting point 521-585°C 970-1085°F

AMS 4145 Mechanical Properties

AMS 4145 has a tensile strength of 480 MPa, higher than most aluminium alloys. It also has a yield strength of 420 MPa, meaning it can sustain considerable loads without deformation. The elongation of AMS 4145 is around 12%, which indicates that it is a relatively malleable alloy.

AMS 4145 Equivalents

  • ANSI/AWS A5.10 (ER & R)
  • ANSI/AWS A5.8
  • AMS 4184

AMS 4145 Uses

AMS 4145 is primarily used in the aerospace industry to manufacture structural components, such as fuselage frames, wing spars, and landing gears. It is also used to construct military vehicles and high-performance racing cars. This alloy is popular for its high strength-to-weight ratio, which allows engineers to reduce the weight of their designs without compromising on strength.

AMS 4145 Hardness

The hardness of AMS 4145 depends on the temper. Its T6 temper, the most commonly used in aerospace applications, has a Rockwell hardness of around 90. This makes it a relatively hard alloy that can withstand wear and tear.

AMS 4145 Heat Treatment

AMS 4145 can be heat-treated to improve its mechanical properties. In the T6 temper, it is solution heat-treated at 505°C for 6 hours and then quenched in cold water. It is then aged at 120°C for 24 hours, which improves its strength and toughness.


AMS 4145 material is a high-strength aluminium alloy widely used in aerospace and other high-performance industries. It has excellent corrosion resistance, high toughness, and fatigue strength, which makes it a popular choice for structural components. Its high strength-to-weight ratio allows engineers to design lightweight yet strong structures. With its unique properties and versatile uses, it is no wonder that the AMS 4145 is a favourite among material engineers.

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