Introduction
This document provides an overview of Alloy 2124, highlighting its typical properties and composition. It is important to note that the properties listed are averages and should not be used as engineering requirements or for design purposes.

Chemical Composition Limits
The chemical composition of Alloy 2124 is defined by the following weight percentages:

• Copper (Cu): 3.80% - 4.90%
• Magnesium (Mg): 1.20% - 1.80%
• Manganese (Mn): 0.30% - 0.90%
• Silicon (Si): up to 0.20%
• Iron (Fe): up to 0.30%
• Zinc (Zn): up to 0.25%
• Titanium (Ti): up to 0.15%
• Chromium (Cr): up to 0.10%
• Each other element: up to 0.05%
• Total other elements: up to 0.15%

Typical Physical Properties
Alloy 2124 exhibits the following physical properties:

• Average Coefficient of Thermal Expansion (68-212°F): 12.7
• Melting Range: 935-1180°F
• Temper: T851
• Thermal Conductivity at 77°F: 1055 (English Units)
• Electrical Conductivity at 68°F: 38 (Equal Volume)
• Electrical Resistivity at 68°F: 122 (Equal Weight)

Typical US Mechanical Properties
The mechanical properties for Alloy 2124 in the T851 temper include:

• Tensile Strength: 70 KSI
• Yield Strength: 64 KSI
• Elongation: 8% in 2 inches
• Brinell Hardness Number: 500 kg load, 10 mm ball
• Ultimate Shearing Strength: Not specified
• Endurance Limit: Not specified
• Modulus of Elasticity: 10.6 KSI x 10³

Conclusion
Alloy 2124 is characterized by its specific chemical composition and mechanical properties, making it suitable for various applications. However, the data provided should be used for comparison purposes only and not as definitive engineering specifications.