AZ31B-H24 is a silvery-white/light gray magnesium-zinc alloy (96% magnesium, 3% aluminum, 1% zinc) that’s extremely light with high tensile strength and good vibration damping. This alloy also has good corrosion resistance, which can be enhanced through anodizing. Together, these properties make it a preferred alloy in many aerospace applications where a high strength-to-weight ratio is a priority.
H24 refers to the condition of AZ31B; additional strength is added by strain hardening, and partial annealing. The alloy has good ductility, is weldable and readily machinable, and has good thermal and electrical conductivity.
AZ31B-H24 sheet is a popular choice for RFI and EMI shielding as it is non-magnetic and readily formed into enclosures. It’s also commonly used in optical systems, laptop cases, cellphones, and audio system speaker cones, all of which benefit from its non-magnetic, vibration-damping properties.
| Property | Value | Notes |
|---|---|---|
| Material Type | Magnesium-zinc alloy | UNS M11311 |
| Density | 1.77 g/cm3 | 0.064 lb/in3 |
| Melting Point | ~ 605-630°C | ~ 1,120-1,170°F |
| Hardness (Brinell) | ~ 73 | |
| Tensile Strength | ~ 290 MPa | ~ 42,100 psi |
| Yield Strength | ~ 220 MPa | ~ 31,900 psi |
| Elongation at Break | ~ 15% | |
| Modulus of Elasticity | ~ 45 GPa | ~ 6.5x106 psi |
| Corrosion Resistance | Generally good, but susceptible to attack by chloride solutions. | Improved by anodizing |
| Magnetism | No | |
| Heat Treatment | H24 = partially annealed, half-hard | |
| Machinability | Good | AZ31B is flammable. Temperature must be controlled while machining. |
| Weldability | Good |
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