ThePipingMart Blog Grades AMS 4149 Aluminum Alloy – Composition, Properties and Uses

AMS 4149 Aluminum Alloy – Composition, Properties and Uses

AMS 4149

AMS4149 is a widely used aluminium alloy with exceptional corrosion resistance and impressive strength. Its unique composition and physical properties make it popular for many aerospace applications. This blog post will dive deeper into AMS 4149, discussing its composition, physical and mechanical properties, uses, hardness, and heat treatment. So, whether you’re an engineer or an enthusiast in the aerospace industry, keep reading to understand everything you need to know about AMS 4149.

What is AMS 4149?

AMS 4149 (also known as 7175 Aluminum Alloy) is a specification standard developed by the Society of Automotive Engineers for the heat treatment of aluminium alloys used in aerospace applications. This specification outlines the requirements for heat-treating procedures and equipment for producing aluminium alloys, including the parameters for solution treatment, quenching, and ageing. The development of AMS4149 has played a crucial role in ensuring the structural integrity and overall safety of aircraft, spacecraft, and other aviation vehicles. With its rigorous standards and meticulous attention to detail, this specification is a testament to the importance of precision and quality in the aerospace industry.

AMS 4149 Composition

AMS 4149 is an aluminium alloy of aluminium, copper, magnesium, iron, silicon, zinc, and titanium. The alloy’s composition is designed to deliver improved mechanical strength, durability, and exceptional corrosion resistance.

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

AMS 4149 Physical Properties

AMS 4149 is known for its impressive physical features, such as its superb resistance to wear and tear and its excellent strength-to-weight ratio. The metal is also incredibly lightweight, making it ideal for aerospace applications that require lightweight materials.

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

AMS 4149 Mechanical Properties

Regarding the mechanical properties of AMS 4149, the alloy exhibits excellent tensile strength, fatigue resistance, and durability. Its mechanical properties make it well-suited for aircraft structural components. The alloy also has a high fatigue resistance, which means it can withstand repetitive loading without cracking.

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

AMS 4149 Uses

AMS 4149 is an alloyed metal used in various aerospace applications, such as structural components for aircraft, high-load applications, and parts that require exceptional corrosion resistance. It is widely used in aircraft manufacturing, particularly commercial and military aviation.

AMS 4149 Hardness

AMS 4149 can be strengthened by heat treatment, which influences its hardness level. The metal’s hardness is measured using the Brinell hardness test, a common metric for assessing the hardness of metals. The hardness level of AMS 4149 is typically around 104-120 HB.

AMS 4149 Heat Treatment

Heat treatment is used to increase the strength and durability of AMS 4149. The process involves heating the metal to a specific temperature, holding it at that temperature for a set amount, and then cooling it at a controlled rate. The most common heat treatment method used for AMS 4149 is T6, which involves solution heat treatment, quenching, and artificial ageing.


In conclusion, AMS 4149 material is an excellent aluminium alloy for aerospace applications, offering impressive physical and mechanical properties. Its unique composition, exceptional strength, and corrosion resistance make it an ideal choice for structural components in aircraft manufacturing. By understanding AMS 4149’s composition, physical and mechanical properties, uses, hardness, and heat treatment, you’ll be better equipped to determine whether it is the right metal for your aerospace project.

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