Ams 5772 Sheet

By Author: Bhavesh Sanghvi
Total Articles: 20
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AMS 5772 is also known as Haynes 188 Alloy. Despite the confusion in your provided text regarding it being an aluminum alloy, AMS 5772 is a cobalt-based superalloy, not aluminum. This alloy is characterized by its excellent high-temperature strength, oxidation resistance, and good fabricability. It is widely used in aerospace and defense applications due to its superior properties, particularly in high-temperature environments.

Chemical Composition
The chemical composition of AMS 5772 (Haynes 188) provides a balance of elements that contribute to its high strength and corrosion resistance:

Element Content (%)
Cobalt (Co) ≥ 37
Nickel (Ni) 22
Chromium (Cr) 22
Tungsten (W) 14
Iron (Fe) ≤ 3
Manganese (Mn) ≤ 1.25
Silicon (Si) ≤ 0.50
Carbon (C) ≤ 0.15
Lanthanum (La) 0.040
Phosphorus (P) 0.020
Sulfur (S) 0.015
Physical Properties
AMS 5772 has excellent physical properties that make it suitable for high-temperature applications:

Property Metric Imperial
Density 8.9 g/cm³ 0.324 lb/in³
Melting Point 1330°C 2425°F
...
... Mechanical Properties
AMS 5772 possesses outstanding mechanical properties which make it suitable for demanding applications:

Tensile Strength: Up to 210 ksi
Yield Strength: Up to 190 ksi
Elastic Modulus: High
Resistance: Excellent fatigue and stress corrosion cracking resistance
Toughness and Flexibility: Exceptional, enabling it to withstand heavy impact and deformation
Heat Treatment
AMS 5772 is typically solution heat treated at 1163-1191°C and rapidly cooled or water quenched to achieve optimum properties. Annealing at lower temperatures can produce carbide precipitation, which may affect the alloy's properties.

Applications
Due to its high strength, excellent oxidation resistance, and good ductility, AMS 5772 is used in a variety of high-performance applications:

Aerospace components such as wings, fuselages, and landing gear
Combustion cans, flame holders, liners, transition ducts, and afterburner parts in gas turbine engines
Built-in military and commercial gas turbine engines
Equivalents
AMS 5772 is equivalent to several other specifications, making it versatile for various applications:

AMS 5608
GE B50A712
GE B50TF74
GE B50TF74A
PWA 1042
Fabrication and Welding
Cold Working: Can be easily cold worked due to its good ductility but may require frequent intermediate annealing due to work hardening.
Hot Working: Suitable for hot working processes; all hot worked parts should be solution heat treated for optimal properties.
Welding: Can be welded using both manual and automatic welding methods, including TIG, MIG, electron beam, and resistance welding.
Conclusion
AMS 5772 (Haynes 188) is a high-performance cobalt-based superalloy that excels in high-temperature and corrosive environments. Its superior mechanical and physical properties make it ideal for critical aerospace and defense applications. With its excellent fabricability and versatility, AMS 5772 remains a preferred choice for engineers and manufacturers in demanding industries.

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