3105 Aluminium

3105 aluminum is a popular type of aluminum alloy that contains a combination of aluminum, magnesium, and manganese. This alloy is commonly used for various applications due to its desirable properties, including corrosion resistance, formability, weldability, strength, and cost-effectiveness.

The composition of 3105 aluminum is as follows:

Aluminum: 98.5% - 99.5%
Magnesium: 0.30% - 0.6%
Manganese: 0.3% - 0.8%
Iron: 0.7% max
Copper: 0.2% max
Zinc: 0.4% max
Silicon: 0.6% max
Others: 0.05% each max, 0.15% total max
The addition of magnesium and manganese to the alloy enhances its formability and strength, respectively. This makes 3105 aluminum suitable for various applications, including roofing, cladding, signage, beverage cans, cooking utensils, automotive parts, and heat exchangers. The alloy also has a smooth surface finish, making it ideal for applications that require a decorative appearance. Additionally, 3105 aluminum is highly recyclable, making it an environmentally friendly choice for many applications.

Chemical Composition

The chemical composition of 3105 aluminum alloy is:

Aluminum (Al): 98.2% - 99.7%
Magnesium (Mg): 0.30% - 0.8%
Manganese (Mn): 0.3% - 0.8%
Iron (Fe): 0.7% max
Copper (Cu): 0.2% max
Zinc (Zn): 0.4% max
Silicon (Si): 0.6% max
Titanium (Ti): 0.1% max
Chromium (Cr): 0.2% max
Other elements: 0.05% each max, 0.15% total max
The addition of magnesium and manganese to the alloy enhances its strength and formability, respectively. The presence of other elements such as copper, iron, silicon, and zinc, improves the alloy's overall properties, including corrosion resistance and machinability.

Mechanical Properties of 3105 Aluminum Alloy 

Tensile strength: 115 - 140 MPa (16,700 - 20,000 psi)
Yield strength: 55 - 80 MPa (8,000 - 11,600 psi)
Elongation at break: 20% - 30%
Modulus of elasticity: 68.9 GPa (10,000 ksi)
Shear strength: 70 - 85 MPa (10,000 - 12,300 psi)
Fatigue strength: 50 MPa (7,250 psi) at 5 x 10^8 cycles
The above properties are typical and can vary depending on the specific manufacturing process and conditions.

The strength of 3105 aluminum alloy is moderate, making it suitable for applications that require moderate strength, but high formability and weldability. Its tensile and yield strengths are lower compared to other aluminum alloys, such as 6061 and 7075, but it is more formable than these alloys. Its elongation at break is relatively high, indicating its excellent formability.

The modulus of elasticity of 3105 aluminum alloy is moderate, making it suitable for applications that require good structural integrity. The shear strength of the alloy is moderate, allowing it to withstand moderate shear forces. The fatigue strength of the alloy is relatively low, making it unsuitable for applications that require high fatigue resistance.