AZ31B magnesium alloy sheet - a deformation magnesium alloy material that combines lightweight and excellent mechanical properties. This alloy achieves a tensile strength of ≥ 260MPa, a yield strength of ≥ 180MPa, and an elongation of ≥ 10% in the H24 work hardened state by precisely controlling the composition ratios of Al (2.5% -3.5%), Zn (0.7% -1.3%), and Mn (≥ 0.20%). Its density is only 1.78g/cm ³ (equivalent to 2/3 of aluminum alloy), and its specific strength is as high as 146MPa · cm ³/g. It is particularly suitable for lightweight demand fields such as aerospace structural components, 3C electronic product casings, and new energy vehicle battery casings.
Material Standard System
Composition specifications: Complies with ASTM B90/B90M-21 standards, with Fe ≤ 0.005%, Si ≤ 0.10%, Cu ≤ 0.05%, Ni ≤ 0.005% (strictly controlling corrosive elements)
Physical properties: density 1.78g/cm ³, thermal conductivity 96W/(m · K), coefficient of linear expansion 26.0 × 10 ⁻⁶/℃ (20-100 ℃)
Breakthrough in Rolling Technology
Warm rolling technology: using 300-350 ℃ multi pass rolling (pass reduction of 10% -15%), with a total deformation of ≥ 80%
Surface treatment: Online fluorination treatment forms a 0.5-1 μ m protective film (salt spray performance is improved by 5 times)
Microstructural characteristics
SEM analysis: The dynamic recrystallization grain size is 5-15 μ m, and the β - Mg17Al12 phase (10-30nm) is discretely distributed along the grain boundaries
XRD detection: basal texture strength ratio ≤ 3.0 (0002)//ND
Mechanical performance spectrum
Anisotropy: Rolling direction/transverse strength ratio ≥ 0.90, r value=2.5-3.0 (excellent deep drawing performance)
Dynamic bearing capacity: Impact toughness ≥ 25J/cm ² (Charpy V-notch)
Forming processing characteristics
Stamping performance: ultimate deep drawing ratio LDR ≥ 2.3, minimum bending radius 1.5T (preheated at 150 ℃)
Superplastic forming: m value ≥ 0.5 at 300 ℃, ultimate elongation ≥ 400%
Corrosion resistant innovation
Surface treatment: Micro arc oxidation film thickness of 20-30 μ m (porosity ≤ 5%), no substrate corrosion after 1000 hours of salt spray testing
Galvanic protection: TiN coating isolation is used when in contact with aluminum alloy (current density ≤ 0.1 μ A/cm ²)
Welding adaptability
Laser welding: Welding speed of 5m/min at a power of 2kW, porosity ≤ 0.5%
Friction Stir Welding: Joint coefficient ≥ 0.9 when traveling at a speed of 400mm/min
Shock absorption performance data
Damping coefficient: SDC ≥ 25% (10 times higher than 6061 aluminum alloy)
Vibration attenuation: resonance amplitude half-life ≤ 0.5s (ISO 10846 standard)