Magnesium AZ81A-T4 (UNS M11810)
AZ81A-T4 is a cast magnesium alloy known for its excellent combination of strength, ductility, and machinability. It is commonly utilized in automotive, aerospace, and marine industries, offering a lightweight solution that enhances performance and efficiency in demanding applications.
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| Chemical Composition | ||
|---|---|---|
| Element | Min | Max |
| Magnesium | —— | Remainder |
| Aluminum | 7.0% | 8.1% |
| Copper | —— | 0.1% |
| Manganese | 0.13% | —— |
| Nickel | —— | 0.01% |
| Silicon | —— | 0.3% |
| Zinc | 0.4% | 1.0% |
The following table provides a list of magnesium AZ81A-T4 properties in both SI and US customary/Imperial units.
Click on the button to switch between Metric and Imperial units.
| Physical Properties | Metric |
|---|---|
| Density | 1800 kg/m3 |
| Mechanical Properties | Metric |
| Tensile Strength (Ultimate) | 275 MPa |
| Tensile Strength (Yield) | 83 MPa |
| Bearing Strength (Ultimate) | 400 MPa |
| Bearing Strength (Yield) | 240 MPa |
| Fatigue Strength # of Cycles 1.0e+8 | 76 MPa |
| Shear Strength | 125 MPa |
| Young’s Modulus (E) | 45 GPa |
| Shear Modulus (G) | 17 GPa |
| Elongation at Break in 50 mm | 15% |
| Poisson’s Ratio (ν) | 0.34 |
| Brinell Hardness 500 kg load, 10 mm ball | 55 |
| Knoop Hardness Converted from Brinell | 70 |
| Rockwell Hardness | 66 |
| Machinability | 100% |
| Charpy Impact V-notch | 6.10 J |
| Thermal Properties | Metric |
| Melting Point Incipient Melting | ≥ 421 °C |
| Solidus | 490 °C |
| Liquidus | 610 °C |
| Thermal Conductivity | 51.1 W/m·K |
| Specific Heat Capacity (Cp) | 1000 J/kg·K |
| Coefficient of Thermal Expansion (αL) | 25.0 1/°C |
| Heat of Fusion | 370 J/g |
| Electrical Properties | Metric |
| Electrical Resistivity | 1.50×10-5 Ω·cm |
The values in this table are approximate and can vary depending on various factors such as the specific manufacturing process and heat treatment applied to the alloy.
Advantages & Disadvantages of Magnesium AZ81A-T4
| Advantages | Disadvantages |
|---|---|
| Lightweight | Flammability |
| High strength-to-weight ratio | Susceptibility to environmental attack |
| Good formability | Limited temperature range |
| Enhanced corrosion resistance | Higher cost |
| Good heat dissipation | Specialized manufacturing requirements |
Applications of Magnesium AZ81A-T4
AZ81A-T4 is employed across multiple industries, providing lightweight strength and durability for diverse uses including:
- Automotive industry: Used in components to reduce weight and improve fuel efficiency.
- Aerospace industry: Utilized in manufacturing aircraft parts such as seat frames, instrument panels, brackets, and structural elements.
- Consumer electronics: Applied in lightweight devices like laptops, tablets, and smartphones, offering structural integrity and enhanced heat dissipation.
- Handheld tools and equipment: Ideal for tool housings, handles, and frames due to its strength-to-weight ratio.
- Sports equipment: Used in bicycles, golf club heads, tennis racquets, and other gear where weight reduction and strength are vital.
- Industrial machinery: Found in machine frames, housings, and equipment components to ease handling and transportation.
- Medical devices: Employed in manufacturing lightweight, biocompatible surgical instruments, orthopedic implants, and prosthetics.