Magnesium AZ91B-F (UNS M11912)
AZ91B-F is a magnesium alloy that is commonly used in die casting applications. It is a high-strength, lightweight alloy that has good ductility and toughness.
| Chemical Composition | ||
|---|---|---|
| Element | Min | Max |
| Magnesium | Remainder | |
| Aluminum | 8.3% | 9.7% |
| Copper | 0.35% | |
| Manganese | 0.13% | |
| Nickel | 0.03% | |
| Silicon | 0.50% | |
| Zinc | 0.35% | 1.0% |
The following table provides a list of magnesium AZ91B-F properties in both SI and US customary/Imperial units.
Click on the icon to switch between Metric and Imperial units.
| Physical Properties | Metric |
|---|---|
| Density | 1810 kg/m3 |
| Mechanical Properties | Metric |
| Tensile Strength (Ultimate) | 230 MPa |
| Tensile Strength (Yield) | 150 MPa |
| Compressive Strength (Yield) | 165 MPa |
| Fatigue Strength # of Cycles 1.0e+7 | 52 - 65 MPa |
| Shear Strength | 140 MPa |
| Young’s Modulus (E) | 44.8 GPa |
| Shear Modulus (G) | 17 GPa |
| Elongation at Break in 50 mm | 3% |
| Poisson’s Ratio (ν) | 0.35 |
| Brinell Hardness 500 kg load, 10 mm ball | 63 |
| Knoop Hardness Converted from Brinell | 84 |
| Rockwell Hardness | 75 |
| Vickers Hardness Converted from Brinell | 71 |
| Machinability | 100% |
| Charpy Impact V-notch | 2.70 J |
| Thermal Properties | Metric |
| Melting Point Incipient Melting | ≥ 421 °C |
| Solidus | 470 °C |
| Liquidus | 595 °C |
| Thermal Conductivity | 72.7 W/m·K |
| Specific Heat Capacity (Cp) | 1047 J/kg·K |
| Coefficient of Thermal Expansion (αL) | 26.0 1/°C |
| Heat of Fusion | 373 J/g |
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 AZ91B-F
| Advantages | Disadvantages |
|---|---|
| Lightweight | Flammability |
| High Strength-to-Weight Ratio | Corrosion Susceptibility |
| Good Castability | Limited Temperature Range |
| Enhanced Mechanical Properties | Higher Cost |
| Good Electrical and Thermal Conductivity | Limited Weldability |
| Excellent Damping Capacity | Potential for Galvanic Corrosion |
Applications of Magnesium AZ91B-F
Magnesium AZ91B-F alloy finds applications in various industries due to its desirable properties. Here are some common applications:
- Automotive Industry: AZ91B-F is used in the automotive sector for components that require lightweight construction, such as engine blocks, transmission cases, intake manifolds, steering columns, and instrument panels.
- Aerospace Industry: The lightweight nature of AZ91B-F makes it suitable for aerospace applications. It can be used in aircraft components like seat frames, brackets, and structural parts, contributing to weight savings and improved performance.
- Electronics and Communication: Magnesium AZ91B-F is utilized in electronic devices where weight reduction and electromagnetic shielding are important. It can be found in laptops, tablets, smartphones, and other portable electronic devices.
- Sports and Recreation: The lightweight and high-strength properties of AZ91B-F make it suitable for sporting goods such as bicycle frames, golf club heads, tennis rackets, and camping equipment. The alloy's damping capacity also helps in reducing vibrations and enhancing performance.
- Industrial Machinery: AZ91B-F is used in various industrial machinery applications, including housings for power tools, machinery components, and die-cast parts that require a balance of strength and weight.
- Medical Equipment: Magnesium alloys, including AZ91B-F, have been explored for medical applications due to their biocompatibility and lightweight properties. Potential uses include orthopedic implants, surgical instruments, and medical device casings.
- Consumer Goods: AZ91B-F can be utilized in consumer goods such as camera bodies, portable audio equipment, and other lightweight products where weight reduction and strength are desired.